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* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.snapshots;
import com.carrotsearch.hppc.cursors.ObjectCursor;
import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.apache.logging.log4j.util.Supplier;
import org.apache.lucene.util.CollectionUtil;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.cluster.ClusterChangedEvent;
import org.elasticsearch.cluster.ClusterState;
import org.elasticsearch.cluster.ClusterStateApplier;
import org.elasticsearch.cluster.ClusterStateUpdateTask;
import org.elasticsearch.cluster.RestoreInProgress;
import org.elasticsearch.cluster.SnapshotDeletionsInProgress;
import org.elasticsearch.cluster.SnapshotsInProgress;
import org.elasticsearch.cluster.SnapshotsInProgress.ShardSnapshotStatus;
import org.elasticsearch.cluster.SnapshotsInProgress.State;
import org.elasticsearch.cluster.metadata.IndexMetaData;
import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
import org.elasticsearch.cluster.metadata.MetaData;
import org.elasticsearch.cluster.metadata.RepositoriesMetaData;
import org.elasticsearch.cluster.node.DiscoveryNode;
import org.elasticsearch.cluster.node.DiscoveryNodes;
import org.elasticsearch.cluster.routing.IndexRoutingTable;
import org.elasticsearch.cluster.routing.IndexShardRoutingTable;
import org.elasticsearch.cluster.routing.RoutingTable;
import org.elasticsearch.cluster.routing.ShardRouting;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.Priority;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.UUIDs;
import org.elasticsearch.common.collect.ImmutableOpenMap;
import org.elasticsearch.common.collect.Tuple;
import org.elasticsearch.common.component.AbstractLifecycleComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.shard.ShardId;
import org.elasticsearch.index.snapshots.IndexShardSnapshotStatus;
import org.elasticsearch.repositories.IndexId;
import org.elasticsearch.repositories.RepositoriesService;
import org.elasticsearch.repositories.Repository;
import org.elasticsearch.repositories.RepositoryData;
import org.elasticsearch.repositories.RepositoryMissingException;
import org.elasticsearch.threadpool.ThreadPool;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.stream.Collectors;
import static java.util.Collections.unmodifiableMap;
import static org.elasticsearch.cluster.SnapshotsInProgress.completed;
/**
* Service responsible for creating snapshots
* <p>
* A typical snapshot creating process looks like this:
* <ul>
* <li>On the master node the {@link #createSnapshot(SnapshotRequest, CreateSnapshotListener)} is called and makes sure that no snapshots is currently running
* and registers the new snapshot in cluster state</li>
* <li>When cluster state is updated the {@link #beginSnapshot(ClusterState, SnapshotsInProgress.Entry, boolean, CreateSnapshotListener)} method
* kicks in and initializes the snapshot in the repository and then populates list of shards that needs to be snapshotted in cluster state</li>
* <li>Each data node is watching for these shards and when new shards scheduled for snapshotting appear in the cluster state, data nodes
* start processing them through {@link SnapshotShardsService#processIndexShardSnapshots(ClusterChangedEvent)} method</li>
* <li>Once shard snapshot is created data node updates state of the shard in the cluster state using the {@link SnapshotShardsService#updateIndexShardSnapshotStatus} method</li>
* <li>When last shard is completed master node in {@link SnapshotShardsService#innerUpdateSnapshotState} method marks the snapshot as completed</li>
* <li>After cluster state is updated, the {@link #endSnapshot(SnapshotsInProgress.Entry)} finalizes snapshot in the repository,
* notifies all {@link #snapshotCompletionListeners} that snapshot is completed, and finally calls {@link #removeSnapshotFromClusterState(Snapshot, SnapshotInfo, Exception)} to remove snapshot from cluster state</li>
* </ul>
*/
public class SnapshotsService extends AbstractLifecycleComponent implements ClusterStateApplier {
private final ClusterService clusterService;
private final IndexNameExpressionResolver indexNameExpressionResolver;
private final RepositoriesService repositoriesService;
private final ThreadPool threadPool;
private final CopyOnWriteArrayList<SnapshotCompletionListener> snapshotCompletionListeners = new CopyOnWriteArrayList<>();
@Inject
public SnapshotsService(Settings settings, ClusterService clusterService, IndexNameExpressionResolver indexNameExpressionResolver, RepositoriesService repositoriesService, ThreadPool threadPool) {
super(settings);
this.clusterService = clusterService;
this.indexNameExpressionResolver = indexNameExpressionResolver;
this.repositoriesService = repositoriesService;
this.threadPool = threadPool;
if (DiscoveryNode.isMasterNode(settings)) {
// addLowPriorityApplier to make sure that Repository will be created before snapshot
clusterService.addLowPriorityApplier(this);
}
}
/**
* Gets the {@link RepositoryData} for the given repository.
*
* @param repositoryName repository name
* @return repository data
*/
public RepositoryData getRepositoryData(final String repositoryName) {
Repository repository = repositoriesService.repository(repositoryName);
assert repository != null; // should only be called once we've validated the repository exists
return repository.getRepositoryData();
}
/**
* Retrieves snapshot from repository
*
* @param repositoryName repository name
* @param snapshotId snapshot id
* @return snapshot
* @throws SnapshotMissingException if snapshot is not found
*/
public SnapshotInfo snapshot(final String repositoryName, final SnapshotId snapshotId) {
List<SnapshotsInProgress.Entry> entries = currentSnapshots(repositoryName, Arrays.asList(snapshotId.getName()));
if (!entries.isEmpty()) {
return inProgressSnapshot(entries.iterator().next());
}
return repositoriesService.repository(repositoryName).getSnapshotInfo(snapshotId);
}
/**
* Returns a list of snapshots from repository sorted by snapshot creation date
*
* @param repositoryName repository name
* @param snapshotIds snapshots for which to fetch snapshot information
* @param incompatibleSnapshotIds snapshots for which not to fetch snapshot information
* @param ignoreUnavailable if true, snapshots that could not be read will only be logged with a warning,
* if false, they will throw an error
* @return list of snapshots
*/
public List<SnapshotInfo> snapshots(final String repositoryName,
final List<SnapshotId> snapshotIds,
final Set<SnapshotId> incompatibleSnapshotIds,
final boolean ignoreUnavailable) {
final Set<SnapshotInfo> snapshotSet = new HashSet<>();
final Set<SnapshotId> snapshotIdsToIterate = new HashSet<>(snapshotIds);
// first, look at the snapshots in progress
final List<SnapshotsInProgress.Entry> entries =
currentSnapshots(repositoryName, snapshotIdsToIterate.stream().map(SnapshotId::getName).collect(Collectors.toList()));
for (SnapshotsInProgress.Entry entry : entries) {
snapshotSet.add(inProgressSnapshot(entry));
snapshotIdsToIterate.remove(entry.snapshot().getSnapshotId());
}
// then, look in the repository
final Repository repository = repositoriesService.repository(repositoryName);
for (SnapshotId snapshotId : snapshotIdsToIterate) {
try {
if (incompatibleSnapshotIds.contains(snapshotId)) {
// an incompatible snapshot - cannot read its snapshot metadata file, just return
// a SnapshotInfo indicating its incompatible
snapshotSet.add(SnapshotInfo.incompatible(snapshotId));
} else {
snapshotSet.add(repository.getSnapshotInfo(snapshotId));
}
} catch (Exception ex) {
if (ignoreUnavailable) {
logger.warn((Supplier<?>) () -> new ParameterizedMessage("failed to get snapshot [{}]", snapshotId), ex);
} else {
throw new SnapshotException(repositoryName, snapshotId, "Snapshot could not be read", ex);
}
}
}
final ArrayList<SnapshotInfo> snapshotList = new ArrayList<>(snapshotSet);
CollectionUtil.timSort(snapshotList);
return Collections.unmodifiableList(snapshotList);
}
/**
* Returns a list of currently running snapshots from repository sorted by snapshot creation date
*
* @param repositoryName repository name
* @return list of snapshots
*/
public List<SnapshotInfo> currentSnapshots(final String repositoryName) {
List<SnapshotInfo> snapshotList = new ArrayList<>();
List<SnapshotsInProgress.Entry> entries = currentSnapshots(repositoryName, Collections.emptyList());
for (SnapshotsInProgress.Entry entry : entries) {
snapshotList.add(inProgressSnapshot(entry));
}
CollectionUtil.timSort(snapshotList);
return Collections.unmodifiableList(snapshotList);
}
/**
* Initializes the snapshotting process.
* <p>
* This method is used by clients to start snapshot. It makes sure that there is no snapshots are currently running and
* creates a snapshot record in cluster state metadata.
*
* @param request snapshot request
* @param listener snapshot creation listener
*/
public void createSnapshot(final SnapshotRequest request, final CreateSnapshotListener listener) {
final String repositoryName = request.repositoryName;
final String snapshotName = request.snapshotName;
validate(repositoryName, snapshotName);
final SnapshotId snapshotId = new SnapshotId(snapshotName, UUIDs.randomBase64UUID()); // new UUID for the snapshot
final RepositoryData repositoryData = repositoriesService.repository(repositoryName).getRepositoryData();
clusterService.submitStateUpdateTask(request.cause(), new ClusterStateUpdateTask() {
private SnapshotsInProgress.Entry newSnapshot = null;
@Override
public ClusterState execute(ClusterState currentState) {
validate(request, currentState);
SnapshotDeletionsInProgress deletionsInProgress = currentState.custom(SnapshotDeletionsInProgress.TYPE);
if (deletionsInProgress != null && deletionsInProgress.hasDeletionsInProgress()) {
throw new ConcurrentSnapshotExecutionException(repositoryName, snapshotName,
"cannot snapshot while a snapshot deletion is in-progress");
}
SnapshotsInProgress snapshots = currentState.custom(SnapshotsInProgress.TYPE);
if (snapshots == null || snapshots.entries().isEmpty()) {
// Store newSnapshot here to be processed in clusterStateProcessed
List<String> indices = Arrays.asList(indexNameExpressionResolver.concreteIndexNames(currentState, request.indicesOptions(), request.indices()));
logger.trace("[{}][{}] creating snapshot for indices [{}]", repositoryName, snapshotName, indices);
List<IndexId> snapshotIndices = repositoryData.resolveNewIndices(indices);
newSnapshot = new SnapshotsInProgress.Entry(new Snapshot(repositoryName, snapshotId),
request.includeGlobalState(),
request.partial(),
State.INIT,
snapshotIndices,
System.currentTimeMillis(),
repositoryData.getGenId(),
null);
snapshots = new SnapshotsInProgress(newSnapshot);
} else {
throw new ConcurrentSnapshotExecutionException(repositoryName, snapshotName, "a snapshot is already running");
}
return ClusterState.builder(currentState).putCustom(SnapshotsInProgress.TYPE, snapshots).build();
}
@Override
public void onFailure(String source, Exception e) {
logger.warn((Supplier<?>) () -> new ParameterizedMessage("[{}][{}] failed to create snapshot", repositoryName, snapshotName), e);
newSnapshot = null;
listener.onFailure(e);
}
@Override
public void clusterStateProcessed(String source, ClusterState oldState, final ClusterState newState) {
if (newSnapshot != null) {
threadPool.executor(ThreadPool.Names.SNAPSHOT).execute(() ->
beginSnapshot(newState, newSnapshot, request.partial(), listener)
);
}
}
@Override
public TimeValue timeout() {
return request.masterNodeTimeout();
}
});
}
/**
* Validates snapshot request
*
* @param request snapshot request
* @param state current cluster state
*/
private void validate(SnapshotRequest request, ClusterState state) {
RepositoriesMetaData repositoriesMetaData = state.getMetaData().custom(RepositoriesMetaData.TYPE);
final String repository = request.repositoryName;
if (repositoriesMetaData == null || repositoriesMetaData.repository(repository) == null) {
throw new RepositoryMissingException(repository);
}
validate(repository, request.snapshotName);
}
private static void validate(final String repositoryName, final String snapshotName) {
if (Strings.hasLength(snapshotName) == false) {
throw new InvalidSnapshotNameException(repositoryName, snapshotName, "cannot be empty");
}
if (snapshotName.contains(" ")) {
throw new InvalidSnapshotNameException(repositoryName, snapshotName, "must not contain whitespace");
}
if (snapshotName.contains(",")) {
throw new InvalidSnapshotNameException(repositoryName, snapshotName, "must not contain ','");
}
if (snapshotName.contains("#")) {
throw new InvalidSnapshotNameException(repositoryName, snapshotName, "must not contain '#'");
}
if (snapshotName.charAt(0) == '_') {
throw new InvalidSnapshotNameException(repositoryName, snapshotName, "must not start with '_'");
}
if (snapshotName.toLowerCase(Locale.ROOT).equals(snapshotName) == false) {
throw new InvalidSnapshotNameException(repositoryName, snapshotName, "must be lowercase");
}
if (Strings.validFileName(snapshotName) == false) {
throw new InvalidSnapshotNameException(repositoryName,
snapshotName,
"must not contain the following characters " + Strings.INVALID_FILENAME_CHARS);
}
}
/**
* Starts snapshot.
* <p>
* Creates snapshot in repository and updates snapshot metadata record with list of shards that needs to be processed.
*
* @param clusterState cluster state
* @param snapshot snapshot meta data
* @param partial allow partial snapshots
* @param userCreateSnapshotListener listener
*/
private void beginSnapshot(final ClusterState clusterState,
final SnapshotsInProgress.Entry snapshot,
final boolean partial,
final CreateSnapshotListener userCreateSnapshotListener) {
boolean snapshotCreated = false;
try {
Repository repository = repositoriesService.repository(snapshot.snapshot().getRepository());
MetaData metaData = clusterState.metaData();
if (!snapshot.includeGlobalState()) {
// Remove global state from the cluster state
MetaData.Builder builder = MetaData.builder();
for (IndexId index : snapshot.indices()) {
builder.put(metaData.index(index.getName()), false);
}
metaData = builder.build();
}
repository.initializeSnapshot(snapshot.snapshot().getSnapshotId(), snapshot.indices(), metaData);
snapshotCreated = true;
if (snapshot.indices().isEmpty()) {
// No indices in this snapshot - we are done
userCreateSnapshotListener.onResponse();
endSnapshot(snapshot);
return;
}
clusterService.submitStateUpdateTask("update_snapshot [" + snapshot.snapshot() + "]", new ClusterStateUpdateTask() {
boolean accepted = false;
SnapshotsInProgress.Entry updatedSnapshot;
String failure = null;
@Override
public ClusterState execute(ClusterState currentState) {
SnapshotsInProgress snapshots = currentState.custom(SnapshotsInProgress.TYPE);
List<SnapshotsInProgress.Entry> entries = new ArrayList<>();
for (SnapshotsInProgress.Entry entry : snapshots.entries()) {
if (entry.snapshot().equals(snapshot.snapshot())) {
// Replace the snapshot that was just created
ImmutableOpenMap<ShardId, SnapshotsInProgress.ShardSnapshotStatus> shards = shards(currentState, entry.indices());
if (!partial) {
Tuple<Set<String>, Set<String>> indicesWithMissingShards = indicesWithMissingShards(shards, currentState.metaData());
Set<String> missing = indicesWithMissingShards.v1();
Set<String> closed = indicesWithMissingShards.v2();
if (missing.isEmpty() == false || closed.isEmpty() == false) {
StringBuilder failureMessage = new StringBuilder();
updatedSnapshot = new SnapshotsInProgress.Entry(entry, State.FAILED, shards);
entries.add(updatedSnapshot);
if (missing.isEmpty() == false ) {
failureMessage.append("Indices don't have primary shards ");
failureMessage.append(missing);
}
if (closed.isEmpty() == false ) {
if (failureMessage.length() > 0) {
failureMessage.append("; ");
}
failureMessage.append("Indices are closed ");
failureMessage.append(closed);
}
failure = failureMessage.toString();
continue;
}
}
updatedSnapshot = new SnapshotsInProgress.Entry(entry, State.STARTED, shards);
entries.add(updatedSnapshot);
if (!completed(shards.values())) {
accepted = true;
}
} else {
entries.add(entry);
}
}
return ClusterState.builder(currentState)
.putCustom(SnapshotsInProgress.TYPE, new SnapshotsInProgress(Collections.unmodifiableList(entries)))
.build();
}
@Override
public void onFailure(String source, Exception e) {
logger.warn((Supplier<?>) () -> new ParameterizedMessage("[{}] failed to create snapshot", snapshot.snapshot().getSnapshotId()), e);
removeSnapshotFromClusterState(snapshot.snapshot(), null, e, new CleanupAfterErrorListener(snapshot, true, userCreateSnapshotListener, e));
}
@Override
public void clusterStateProcessed(String source, ClusterState oldState, ClusterState newState) {
// The userCreateSnapshotListener.onResponse() notifies caller that the snapshot was accepted
// for processing. If client wants to wait for the snapshot completion, it can register snapshot
// completion listener in this method. For the snapshot completion to work properly, the snapshot
// should still exist when listener is registered.
userCreateSnapshotListener.onResponse();
// Now that snapshot completion listener is registered we can end the snapshot if needed
// We should end snapshot only if 1) we didn't accept it for processing (which happens when there
// is nothing to do) and 2) there was a snapshot in metadata that we should end. Otherwise we should
// go ahead and continue working on this snapshot rather then end here.
if (!accepted && updatedSnapshot != null) {
endSnapshot(updatedSnapshot, failure);
}
}
});
} catch (Exception e) {
logger.warn((Supplier<?>) () -> new ParameterizedMessage("failed to create snapshot [{}]", snapshot.snapshot().getSnapshotId()), e);
removeSnapshotFromClusterState(snapshot.snapshot(), null, e, new CleanupAfterErrorListener(snapshot, snapshotCreated, userCreateSnapshotListener, e));
}
}
private class CleanupAfterErrorListener implements ActionListener<SnapshotInfo> {
private final SnapshotsInProgress.Entry snapshot;
private final boolean snapshotCreated;
private final CreateSnapshotListener userCreateSnapshotListener;
private final Exception e;
CleanupAfterErrorListener(SnapshotsInProgress.Entry snapshot, boolean snapshotCreated, CreateSnapshotListener userCreateSnapshotListener, Exception e) {
this.snapshot = snapshot;
this.snapshotCreated = snapshotCreated;
this.userCreateSnapshotListener = userCreateSnapshotListener;
this.e = e;
}
@Override
public void onResponse(SnapshotInfo snapshotInfo) {
cleanupAfterError(this.e);
}
@Override
public void onFailure(Exception e) {
e.addSuppressed(this.e);
cleanupAfterError(e);
}
private void cleanupAfterError(Exception exception) {
if(snapshotCreated) {
try {
repositoriesService.repository(snapshot.snapshot().getRepository())
.finalizeSnapshot(snapshot.snapshot().getSnapshotId(),
snapshot.indices(),
snapshot.startTime(),
ExceptionsHelper.detailedMessage(exception),
0,
Collections.emptyList(),
snapshot.getRepositoryStateId());
} catch (Exception inner) {
inner.addSuppressed(exception);
logger.warn((Supplier<?>) () -> new ParameterizedMessage("[{}] failed to close snapshot in repository", snapshot.snapshot()), inner);
}
}
userCreateSnapshotListener.onFailure(e);
}
}
private SnapshotInfo inProgressSnapshot(SnapshotsInProgress.Entry entry) {
return new SnapshotInfo(entry.snapshot().getSnapshotId(),
entry.indices().stream().map(IndexId::getName).collect(Collectors.toList()),
entry.startTime());
}
/**
* Returns status of the currently running snapshots
* <p>
* This method is executed on master node
* </p>
*
* @param repository repository id
* @param snapshots list of snapshots that will be used as a filter, empty list means no snapshots are filtered
* @return list of metadata for currently running snapshots
*/
public List<SnapshotsInProgress.Entry> currentSnapshots(final String repository, final List<String> snapshots) {
SnapshotsInProgress snapshotsInProgress = clusterService.state().custom(SnapshotsInProgress.TYPE);
if (snapshotsInProgress == null || snapshotsInProgress.entries().isEmpty()) {
return Collections.emptyList();
}
if ("_all".equals(repository)) {
return snapshotsInProgress.entries();
}
if (snapshotsInProgress.entries().size() == 1) {
// Most likely scenario - one snapshot is currently running
// Check this snapshot against the query
SnapshotsInProgress.Entry entry = snapshotsInProgress.entries().get(0);
if (entry.snapshot().getRepository().equals(repository) == false) {
return Collections.emptyList();
}
if (snapshots.isEmpty() == false) {
for (String snapshot : snapshots) {
if (entry.snapshot().getSnapshotId().getName().equals(snapshot)) {
return snapshotsInProgress.entries();
}
}
return Collections.emptyList();
} else {
return snapshotsInProgress.entries();
}
}
List<SnapshotsInProgress.Entry> builder = new ArrayList<>();
for (SnapshotsInProgress.Entry entry : snapshotsInProgress.entries()) {
if (entry.snapshot().getRepository().equals(repository) == false) {
continue;
}
if (snapshots.isEmpty() == false) {
for (String snapshot : snapshots) {
if (entry.snapshot().getSnapshotId().getName().equals(snapshot)) {
builder.add(entry);
break;
}
}
} else {
builder.add(entry);
}
}
return Collections.unmodifiableList(builder);
}
/**
* Returns status of shards currently finished snapshots
* <p>
* This method is executed on master node and it's complimentary to the
* {@link SnapshotShardsService#currentSnapshotShards(Snapshot)} because it
* returns similar information but for already finished snapshots.
* </p>
*
* @param repositoryName repository name
* @param snapshotInfo snapshot info
* @return map of shard id to snapshot status
*/
public Map<ShardId, IndexShardSnapshotStatus> snapshotShards(final String repositoryName,
final SnapshotInfo snapshotInfo) throws IOException {
Map<ShardId, IndexShardSnapshotStatus> shardStatus = new HashMap<>();
Repository repository = repositoriesService.repository(repositoryName);
RepositoryData repositoryData = repository.getRepositoryData();
MetaData metaData = repository.getSnapshotMetaData(snapshotInfo, repositoryData.resolveIndices(snapshotInfo.indices()));
for (String index : snapshotInfo.indices()) {
IndexId indexId = repositoryData.resolveIndexId(index);
IndexMetaData indexMetaData = metaData.indices().get(index);
if (indexMetaData != null) {
int numberOfShards = indexMetaData.getNumberOfShards();
for (int i = 0; i < numberOfShards; i++) {
ShardId shardId = new ShardId(indexMetaData.getIndex(), i);
SnapshotShardFailure shardFailure = findShardFailure(snapshotInfo.shardFailures(), shardId);
if (shardFailure != null) {
IndexShardSnapshotStatus shardSnapshotStatus = new IndexShardSnapshotStatus();
shardSnapshotStatus.updateStage(IndexShardSnapshotStatus.Stage.FAILURE);
shardSnapshotStatus.failure(shardFailure.reason());
shardStatus.put(shardId, shardSnapshotStatus);
} else {
final IndexShardSnapshotStatus shardSnapshotStatus;
if (snapshotInfo.state() == SnapshotState.FAILED) {
// If the snapshot failed, but the shard's snapshot does
// not have an exception, it means that partial snapshots
// were disabled and in this case, the shard snapshot will
// *not* have any metadata, so attempting to read the shard
// snapshot status will throw an exception. Instead, we create
// a status for the shard to indicate that the shard snapshot
// could not be taken due to partial being set to false.
shardSnapshotStatus = new IndexShardSnapshotStatus();
shardSnapshotStatus.updateStage(IndexShardSnapshotStatus.Stage.FAILURE);
shardSnapshotStatus.failure("skipped");
} else {
shardSnapshotStatus = repository.getShardSnapshotStatus(
snapshotInfo.snapshotId(),
snapshotInfo.version(),
indexId,
shardId);
}
shardStatus.put(shardId, shardSnapshotStatus);
}
}
}
}
return unmodifiableMap(shardStatus);
}
private SnapshotShardFailure findShardFailure(List<SnapshotShardFailure> shardFailures, ShardId shardId) {
for (SnapshotShardFailure shardFailure : shardFailures) {
if (shardId.getIndexName().equals(shardFailure.index()) && shardId.getId() == shardFailure.shardId()) {
return shardFailure;
}
}
return null;
}
@Override
public void applyClusterState(ClusterChangedEvent event) {
try {
if (event.localNodeMaster()) {
if (event.nodesRemoved()) {
processSnapshotsOnRemovedNodes(event);
}
if (event.routingTableChanged()) {
processStartedShards(event);
}
removeFinishedSnapshotFromClusterState(event);
finalizeSnapshotDeletionFromPreviousMaster(event);
}
} catch (Exception e) {
logger.warn("Failed to update snapshot state ", e);
}
}
/**
* Finalizes a snapshot deletion in progress if the current node is the master but it
* was not master in the previous cluster state and there is still a lingering snapshot
* deletion in progress in the cluster state. This means that the old master failed
* before it could clean up an in-progress snapshot deletion. We attempt to delete the
* snapshot files and remove the deletion from the cluster state. It is possible that the
* old master was in a state of long GC and then it resumes and tries to delete the snapshot
* that has already been deleted by the current master. This is acceptable however, since
* the old master's snapshot deletion will just respond with an error but in actuality, the
* snapshot was deleted and a call to GET snapshots would reveal that the snapshot no longer exists.
*/
private void finalizeSnapshotDeletionFromPreviousMaster(ClusterChangedEvent event) {
if (event.localNodeMaster() && event.previousState().nodes().isLocalNodeElectedMaster() == false) {
SnapshotDeletionsInProgress deletionsInProgress = event.state().custom(SnapshotDeletionsInProgress.TYPE);
if (deletionsInProgress != null && deletionsInProgress.hasDeletionsInProgress()) {
assert deletionsInProgress.getEntries().size() == 1 : "only one in-progress deletion allowed per cluster";
SnapshotDeletionsInProgress.Entry entry = deletionsInProgress.getEntries().get(0);
deleteSnapshotFromRepository(entry.getSnapshot(), null, entry.getRepositoryStateId());
}
}
}
/**
* Removes a finished snapshot from the cluster state. This can happen if the previous
* master node processed a cluster state update that marked the snapshot as finished,
* but the previous master node died before removing the snapshot in progress from the
* cluster state. It is then the responsibility of the new master node to end the
* snapshot and remove it from the cluster state.
*/
private void removeFinishedSnapshotFromClusterState(ClusterChangedEvent event) {
if (event.localNodeMaster() && !event.previousState().nodes().isLocalNodeElectedMaster()) {
SnapshotsInProgress snapshotsInProgress = event.state().custom(SnapshotsInProgress.TYPE);
if (snapshotsInProgress != null && !snapshotsInProgress.entries().isEmpty()) {
for (SnapshotsInProgress.Entry entry : snapshotsInProgress.entries()) {
if (entry.state().completed()) {
endSnapshot(entry);
}
}
}
}
}
/**
* Cleans up shard snapshots that were running on removed nodes
*
* @param event cluster changed event
*/
private void processSnapshotsOnRemovedNodes(ClusterChangedEvent event) {
if (removedNodesCleanupNeeded(event)) {
// Check if we just became the master
final boolean newMaster = !event.previousState().nodes().isLocalNodeElectedMaster();
clusterService.submitStateUpdateTask("update snapshot state after node removal", new ClusterStateUpdateTask() {
@Override
public ClusterState execute(ClusterState currentState) throws Exception {
DiscoveryNodes nodes = currentState.nodes();
SnapshotsInProgress snapshots = currentState.custom(SnapshotsInProgress.TYPE);
if (snapshots == null) {
return currentState;
}
boolean changed = false;
ArrayList<SnapshotsInProgress.Entry> entries = new ArrayList<>();
for (final SnapshotsInProgress.Entry snapshot : snapshots.entries()) {
SnapshotsInProgress.Entry updatedSnapshot = snapshot;
boolean snapshotChanged = false;
if (snapshot.state() == State.STARTED || snapshot.state() == State.ABORTED) {
ImmutableOpenMap.Builder<ShardId, ShardSnapshotStatus> shards = ImmutableOpenMap.builder();
for (ObjectObjectCursor<ShardId, ShardSnapshotStatus> shardEntry : snapshot.shards()) {
ShardSnapshotStatus shardStatus = shardEntry.value;
if (!shardStatus.state().completed() && shardStatus.nodeId() != null) {
if (nodes.nodeExists(shardStatus.nodeId())) {
shards.put(shardEntry.key, shardEntry.value);
} else {
// TODO: Restart snapshot on another node?
snapshotChanged = true;
logger.warn("failing snapshot of shard [{}] on closed node [{}]", shardEntry.key, shardStatus.nodeId());
shards.put(shardEntry.key, new ShardSnapshotStatus(shardStatus.nodeId(), State.FAILED, "node shutdown"));
}
}
}
if (snapshotChanged) {
changed = true;
ImmutableOpenMap<ShardId, ShardSnapshotStatus> shardsMap = shards.build();
if (!snapshot.state().completed() && completed(shardsMap.values())) {
updatedSnapshot = new SnapshotsInProgress.Entry(snapshot, State.SUCCESS, shardsMap);
endSnapshot(updatedSnapshot);
} else {
updatedSnapshot = new SnapshotsInProgress.Entry(snapshot, snapshot.state(), shardsMap);
}
}
entries.add(updatedSnapshot);
} else if (snapshot.state() == State.INIT && newMaster) {
// Clean up the snapshot that failed to start from the old master
deleteSnapshot(snapshot.snapshot(), new DeleteSnapshotListener() {
@Override
public void onResponse() {
logger.debug("cleaned up abandoned snapshot {} in INIT state", snapshot.snapshot());
}
@Override
public void onFailure(Exception e) {
logger.warn("failed to clean up abandoned snapshot {} in INIT state", snapshot.snapshot());
}
}, updatedSnapshot.getRepositoryStateId(), false);
} else if (snapshot.state() == State.SUCCESS && newMaster) {
// Finalize the snapshot
endSnapshot(snapshot);
}
}
if (changed) {
snapshots = new SnapshotsInProgress(entries.toArray(new SnapshotsInProgress.Entry[entries.size()]));
return ClusterState.builder(currentState).putCustom(SnapshotsInProgress.TYPE, snapshots).build();
}
return currentState;
}
@Override
public void onFailure(String source, Exception e) {
logger.warn("failed to update snapshot state after node removal");
}
});
}
}
private void processStartedShards(ClusterChangedEvent event) {
if (waitingShardsStartedOrUnassigned(event)) {
clusterService.submitStateUpdateTask("update snapshot state after shards started", new ClusterStateUpdateTask() {
@Override
public ClusterState execute(ClusterState currentState) throws Exception {
RoutingTable routingTable = currentState.routingTable();
SnapshotsInProgress snapshots = currentState.custom(SnapshotsInProgress.TYPE);
if (snapshots != null) {
boolean changed = false;
ArrayList<SnapshotsInProgress.Entry> entries = new ArrayList<>();
for (final SnapshotsInProgress.Entry snapshot : snapshots.entries()) {
SnapshotsInProgress.Entry updatedSnapshot = snapshot;
if (snapshot.state() == State.STARTED) {
ImmutableOpenMap<ShardId, ShardSnapshotStatus> shards = processWaitingShards(snapshot.shards(), routingTable);
if (shards != null) {
changed = true;
if (!snapshot.state().completed() && completed(shards.values())) {
updatedSnapshot = new SnapshotsInProgress.Entry(snapshot, State.SUCCESS, shards);
endSnapshot(updatedSnapshot);
} else {
updatedSnapshot = new SnapshotsInProgress.Entry(snapshot, shards);
}
}
entries.add(updatedSnapshot);
}
}
if (changed) {
snapshots = new SnapshotsInProgress(entries.toArray(new SnapshotsInProgress.Entry[entries.size()]));
return ClusterState.builder(currentState).putCustom(SnapshotsInProgress.TYPE, snapshots).build();
}
}
return currentState;
}
@Override
public void onFailure(String source, Exception e) {
logger.warn((Supplier<?>) () -> new ParameterizedMessage("failed to update snapshot state after shards started from [{}] ", source), e);
}
});
}
}
private ImmutableOpenMap<ShardId, ShardSnapshotStatus> processWaitingShards(
ImmutableOpenMap<ShardId, ShardSnapshotStatus> snapshotShards, RoutingTable routingTable) {
boolean snapshotChanged = false;
ImmutableOpenMap.Builder<ShardId, ShardSnapshotStatus> shards = ImmutableOpenMap.builder();
for (ObjectObjectCursor<ShardId, ShardSnapshotStatus> shardEntry : snapshotShards) {
ShardSnapshotStatus shardStatus = shardEntry.value;
ShardId shardId = shardEntry.key;
if (shardStatus.state() == State.WAITING) {
IndexRoutingTable indexShardRoutingTable = routingTable.index(shardId.getIndex());
if (indexShardRoutingTable != null) {
IndexShardRoutingTable shardRouting = indexShardRoutingTable.shard(shardId.id());
if (shardRouting != null && shardRouting.primaryShard() != null) {
if (shardRouting.primaryShard().started()) {
// Shard that we were waiting for has started on a node, let's process it
snapshotChanged = true;
logger.trace("starting shard that we were waiting for [{}] on node [{}]", shardId, shardStatus.nodeId());
shards.put(shardId, new ShardSnapshotStatus(shardRouting.primaryShard().currentNodeId()));
continue;
} else if (shardRouting.primaryShard().initializing() || shardRouting.primaryShard().relocating()) {
// Shard that we were waiting for hasn't started yet or still relocating - will continue to wait
shards.put(shardId, shardStatus);
continue;
}
}
}
// Shard that we were waiting for went into unassigned state or disappeared - giving up
snapshotChanged = true;
logger.warn("failing snapshot of shard [{}] on unassigned shard [{}]", shardId, shardStatus.nodeId());
shards.put(shardId, new ShardSnapshotStatus(shardStatus.nodeId(), State.FAILED, "shard is unassigned"));
} else {
shards.put(shardId, shardStatus);
}
}
if (snapshotChanged) {
return shards.build();
} else {
return null;
}
}
private boolean waitingShardsStartedOrUnassigned(ClusterChangedEvent event) {
SnapshotsInProgress curr = event.state().custom(SnapshotsInProgress.TYPE);
if (curr != null) {
for (SnapshotsInProgress.Entry entry : curr.entries()) {
if (entry.state() == State.STARTED && !entry.waitingIndices().isEmpty()) {
for (ObjectCursor<String> index : entry.waitingIndices().keys()) {
if (event.indexRoutingTableChanged(index.value)) {
IndexRoutingTable indexShardRoutingTable = event.state().getRoutingTable().index(index.value);
for (ShardId shardId : entry.waitingIndices().get(index.value)) {
ShardRouting shardRouting = indexShardRoutingTable.shard(shardId.id()).primaryShard();
if (shardRouting != null && (shardRouting.started() || shardRouting.unassigned())) {
return true;
}
}
}
}
}
}
}
return false;
}
private boolean removedNodesCleanupNeeded(ClusterChangedEvent event) {
SnapshotsInProgress snapshotsInProgress = event.state().custom(SnapshotsInProgress.TYPE);
if (snapshotsInProgress == null) {
return false;
}
// Check if we just became the master
boolean newMaster = !event.previousState().nodes().isLocalNodeElectedMaster();
for (SnapshotsInProgress.Entry snapshot : snapshotsInProgress.entries()) {
if (newMaster && (snapshot.state() == State.SUCCESS || snapshot.state() == State.INIT)) {
// We just replaced old master and snapshots in intermediate states needs to be cleaned
return true;
}
for (DiscoveryNode node : event.nodesDelta().removedNodes()) {
for (ObjectCursor<ShardSnapshotStatus> shardStatus : snapshot.shards().values()) {
if (!shardStatus.value.state().completed() && node.getId().equals(shardStatus.value.nodeId())) {
// At least one shard was running on the removed node - we need to fail it
return true;
}
}
}
}
return false;
}
/**
* Returns list of indices with missing shards, and list of indices that are closed
*
* @param shards list of shard statuses
* @return list of failed and closed indices
*/
private Tuple<Set<String>, Set<String>> indicesWithMissingShards(ImmutableOpenMap<ShardId, SnapshotsInProgress.ShardSnapshotStatus> shards, MetaData metaData) {
Set<String> missing = new HashSet<>();
Set<String> closed = new HashSet<>();
for (ObjectObjectCursor<ShardId, SnapshotsInProgress.ShardSnapshotStatus> entry : shards) {
if (entry.value.state() == State.MISSING) {
if (metaData.hasIndex(entry.key.getIndex().getName()) && metaData.getIndexSafe(entry.key.getIndex()).getState() == IndexMetaData.State.CLOSE) {
closed.add(entry.key.getIndex().getName());
} else {
missing.add(entry.key.getIndex().getName());
}
}
}
return new Tuple<>(missing, closed);
}
/**
* Finalizes the shard in repository and then removes it from cluster state
* <p>
* This is non-blocking method that runs on a thread from SNAPSHOT thread pool
*
* @param entry snapshot
*/
void endSnapshot(SnapshotsInProgress.Entry entry) {
endSnapshot(entry, null);
}
/**
* Finalizes the shard in repository and then removes it from cluster state
* <p>
* This is non-blocking method that runs on a thread from SNAPSHOT thread pool
*
* @param entry snapshot
* @param failure failure reason or null if snapshot was successful
*/
private void endSnapshot(final SnapshotsInProgress.Entry entry, final String failure) {
threadPool.executor(ThreadPool.Names.SNAPSHOT).execute(new Runnable() {
@Override
public void run() {
final Snapshot snapshot = entry.snapshot();
try {
final Repository repository = repositoriesService.repository(snapshot.getRepository());
logger.trace("[{}] finalizing snapshot in repository, state: [{}], failure[{}]", snapshot, entry.state(), failure);
ArrayList<SnapshotShardFailure> shardFailures = new ArrayList<>();
for (ObjectObjectCursor<ShardId, ShardSnapshotStatus> shardStatus : entry.shards()) {
ShardId shardId = shardStatus.key;
ShardSnapshotStatus status = shardStatus.value;
if (status.state().failed()) {
shardFailures.add(new SnapshotShardFailure(status.nodeId(), shardId, status.reason()));
}
}
SnapshotInfo snapshotInfo = repository.finalizeSnapshot(
snapshot.getSnapshotId(),
entry.indices(),
entry.startTime(),
failure,
entry.shards().size(),
Collections.unmodifiableList(shardFailures),
entry.getRepositoryStateId());
removeSnapshotFromClusterState(snapshot, snapshotInfo, null);
} catch (Exception e) {
logger.warn((Supplier<?>) () -> new ParameterizedMessage("[{}] failed to finalize snapshot", snapshot), e);
removeSnapshotFromClusterState(snapshot, null, e);
}
}
});
}
/**
* Removes record of running snapshot from cluster state
* @param snapshot snapshot
* @param snapshotInfo snapshot info if snapshot was successful
* @param e exception if snapshot failed
*/
private void removeSnapshotFromClusterState(final Snapshot snapshot, final SnapshotInfo snapshotInfo, final Exception e) {
removeSnapshotFromClusterState(snapshot, snapshotInfo, e, null);
}
/**
* Removes record of running snapshot from cluster state and notifies the listener when this action is complete
* @param snapshot snapshot
* @param failure exception if snapshot failed
* @param listener listener to notify when snapshot information is removed from the cluster state
*/
private void removeSnapshotFromClusterState(final Snapshot snapshot, final SnapshotInfo snapshotInfo, final Exception failure,
@Nullable ActionListener<SnapshotInfo> listener) {
clusterService.submitStateUpdateTask("remove snapshot metadata", new ClusterStateUpdateTask() {
@Override
public ClusterState execute(ClusterState currentState) {
SnapshotsInProgress snapshots = currentState.custom(SnapshotsInProgress.TYPE);
if (snapshots != null) {
boolean changed = false;
ArrayList<SnapshotsInProgress.Entry> entries = new ArrayList<>();
for (SnapshotsInProgress.Entry entry : snapshots.entries()) {
if (entry.snapshot().equals(snapshot)) {
changed = true;
} else {
entries.add(entry);
}
}
if (changed) {
snapshots = new SnapshotsInProgress(entries.toArray(new SnapshotsInProgress.Entry[entries.size()]));
return ClusterState.builder(currentState).putCustom(SnapshotsInProgress.TYPE, snapshots).build();
}
}
return currentState;
}
@Override
public void onFailure(String source, Exception e) {
logger.warn((Supplier<?>) () -> new ParameterizedMessage("[{}] failed to remove snapshot metadata", snapshot), e);
if (listener != null) {
listener.onFailure(e);
}
}
@Override
public void clusterStateProcessed(String source, ClusterState oldState, ClusterState newState) {
for (SnapshotCompletionListener listener : snapshotCompletionListeners) {
try {
if (snapshotInfo != null) {
listener.onSnapshotCompletion(snapshot, snapshotInfo);
} else {
listener.onSnapshotFailure(snapshot, failure);
}
} catch (Exception t) {
logger.warn((Supplier<?>) () -> new ParameterizedMessage("failed to notify listener [{}]", listener), t);
}
}
if (listener != null) {
listener.onResponse(snapshotInfo);
}
}
});
}
/**
* Deletes a snapshot from the repository, looking up the {@link Snapshot} reference before deleting.
* If the snapshot is still running cancels the snapshot first and then deletes it from the repository.
*
* @param repositoryName repositoryName
* @param snapshotName snapshotName
* @param listener listener
*/
public void deleteSnapshot(final String repositoryName, final String snapshotName, final DeleteSnapshotListener listener,
final boolean immediatePriority) {
// First, look for the snapshot in the repository
final Repository repository = repositoriesService.repository(repositoryName);
final RepositoryData repositoryData = repository.getRepositoryData();
final Optional<SnapshotId> incompatibleSnapshotId =
repositoryData.getIncompatibleSnapshotIds().stream().filter(s -> snapshotName.equals(s.getName())).findFirst();
if (incompatibleSnapshotId.isPresent()) {
throw new SnapshotException(repositoryName, snapshotName, "cannot delete incompatible snapshot");
}
Optional<SnapshotId> matchedEntry = repositoryData.getSnapshotIds()
.stream()
.filter(s -> s.getName().equals(snapshotName))
.findFirst();
// if nothing found by the same name, then look in the cluster state for current in progress snapshots
if (matchedEntry.isPresent() == false) {
matchedEntry = currentSnapshots(repositoryName, Collections.emptyList()).stream()
.map(e -> e.snapshot().getSnapshotId()).filter(s -> s.getName().equals(snapshotName)).findFirst();
}
if (matchedEntry.isPresent() == false) {
throw new SnapshotMissingException(repositoryName, snapshotName);
}
deleteSnapshot(new Snapshot(repositoryName, matchedEntry.get()), listener, repositoryData.getGenId(), immediatePriority);
}
/**
* Deletes snapshot from repository.
* <p>
* If the snapshot is still running cancels the snapshot first and then deletes it from the repository.
*
* @param snapshot snapshot
* @param listener listener
* @param repositoryStateId the unique id for the state of the repository
*/
private void deleteSnapshot(final Snapshot snapshot, final DeleteSnapshotListener listener, final long repositoryStateId,
final boolean immediatePriority) {
Priority priority = immediatePriority ? Priority.IMMEDIATE : Priority.NORMAL;
clusterService.submitStateUpdateTask("delete snapshot", new ClusterStateUpdateTask(priority) {
boolean waitForSnapshot = false;
@Override
public ClusterState execute(ClusterState currentState) throws Exception {
SnapshotDeletionsInProgress deletionsInProgress = currentState.custom(SnapshotDeletionsInProgress.TYPE);
if (deletionsInProgress != null && deletionsInProgress.hasDeletionsInProgress()) {
throw new ConcurrentSnapshotExecutionException(snapshot, "cannot delete - another snapshot is currently being deleted");
}
RestoreInProgress restoreInProgress = currentState.custom(RestoreInProgress.TYPE);
if (restoreInProgress != null) {
// don't allow snapshot deletions while a restore is taking place,
// otherwise we could end up deleting a snapshot that is being restored
// and the files the restore depends on would all be gone
if (restoreInProgress.entries().isEmpty() == false) {
throw new ConcurrentSnapshotExecutionException(snapshot, "cannot delete snapshot during a restore");
}
}
ClusterState.Builder clusterStateBuilder = ClusterState.builder(currentState);
SnapshotsInProgress snapshots = currentState.custom(SnapshotsInProgress.TYPE);
SnapshotsInProgress.Entry snapshotEntry = snapshots != null ? snapshots.snapshot(snapshot) : null;
if (snapshotEntry == null) {
// This snapshot is not running - delete
if (snapshots != null && !snapshots.entries().isEmpty()) {
// However other snapshots are running - cannot continue
throw new ConcurrentSnapshotExecutionException(snapshot, "another snapshot is currently running cannot delete");
}
// add the snapshot deletion to the cluster state
SnapshotDeletionsInProgress.Entry entry = new SnapshotDeletionsInProgress.Entry(
snapshot,
System.currentTimeMillis(),
repositoryStateId
);
if (deletionsInProgress != null) {
deletionsInProgress = deletionsInProgress.withAddedEntry(entry);
} else {
deletionsInProgress = SnapshotDeletionsInProgress.newInstance(entry);
}
clusterStateBuilder.putCustom(SnapshotDeletionsInProgress.TYPE, deletionsInProgress);
} else {
// This snapshot is currently running - stopping shards first
waitForSnapshot = true;
ImmutableOpenMap<ShardId, ShardSnapshotStatus> shards;
if (snapshotEntry.state() == State.STARTED && snapshotEntry.shards() != null) {
// snapshot is currently running - stop started shards
ImmutableOpenMap.Builder<ShardId, ShardSnapshotStatus> shardsBuilder = ImmutableOpenMap.builder();
for (ObjectObjectCursor<ShardId, ShardSnapshotStatus> shardEntry : snapshotEntry.shards()) {
ShardSnapshotStatus status = shardEntry.value;
if (!status.state().completed()) {
shardsBuilder.put(shardEntry.key, new ShardSnapshotStatus(status.nodeId(), State.ABORTED));
} else {
shardsBuilder.put(shardEntry.key, status);
}
}
shards = shardsBuilder.build();
} else if (snapshotEntry.state() == State.INIT) {
// snapshot hasn't started yet - end it
shards = snapshotEntry.shards();
endSnapshot(snapshotEntry);
} else {
boolean hasUncompletedShards = false;
// Cleanup in case a node gone missing and snapshot wasn't updated for some reason
for (ObjectCursor<ShardSnapshotStatus> shardStatus : snapshotEntry.shards().values()) {
// Check if we still have shard running on existing nodes
if (shardStatus.value.state().completed() == false && shardStatus.value.nodeId() != null
&& currentState.nodes().get(shardStatus.value.nodeId()) != null) {
hasUncompletedShards = true;
break;
}
}
if (hasUncompletedShards) {
// snapshot is being finalized - wait for shards to complete finalization process
logger.debug("trying to delete completed snapshot - should wait for shards to finalize on all nodes");
return currentState;
} else {
// no shards to wait for - finish the snapshot
logger.debug("trying to delete completed snapshot with no finalizing shards - can delete immediately");
shards = snapshotEntry.shards();
endSnapshot(snapshotEntry);
}
}
SnapshotsInProgress.Entry newSnapshot = new SnapshotsInProgress.Entry(snapshotEntry, State.ABORTED, shards);
snapshots = new SnapshotsInProgress(newSnapshot);
clusterStateBuilder.putCustom(SnapshotsInProgress.TYPE, snapshots);
}
return clusterStateBuilder.build();
}
@Override
public void onFailure(String source, Exception e) {
listener.onFailure(e);
}
@Override
public void clusterStateProcessed(String source, ClusterState oldState, ClusterState newState) {
if (waitForSnapshot) {
logger.trace("adding snapshot completion listener to wait for deleted snapshot to finish");
addListener(new SnapshotCompletionListener() {
@Override
public void onSnapshotCompletion(Snapshot completedSnapshot, SnapshotInfo snapshotInfo) {
if (completedSnapshot.equals(snapshot)) {
logger.trace("deleted snapshot completed - deleting files");
removeListener(this);
threadPool.executor(ThreadPool.Names.SNAPSHOT).execute(() ->
deleteSnapshot(completedSnapshot.getRepository(), completedSnapshot.getSnapshotId().getName(),
listener, true)
);
}
}
@Override
public void onSnapshotFailure(Snapshot failedSnapshot, Exception e) {
if (failedSnapshot.equals(snapshot)) {
logger.warn("deleted snapshot failed - deleting files", e);
removeListener(this);
threadPool.executor(ThreadPool.Names.SNAPSHOT).execute(() -> {
try {
deleteSnapshot(failedSnapshot.getRepository(),
failedSnapshot.getSnapshotId().getName(),
listener,
true);
} catch (SnapshotMissingException smex) {
logger.info((Supplier<?>) () -> new ParameterizedMessage(
"Tried deleting in-progress snapshot [{}], but it " +
"could not be found after failing to abort.",
smex.getSnapshotName()), e);
listener.onFailure(new SnapshotException(snapshot,
"Tried deleting in-progress snapshot [{}], but it " +
"could not be found after failing to abort.", smex));
}
});
}
}
});
} else {
logger.trace("deleted snapshot is not running - deleting files");
deleteSnapshotFromRepository(snapshot, listener, repositoryStateId);
}
}
});
}
/**
* Checks if a repository is currently in use by one of the snapshots
*
* @param clusterState cluster state
* @param repository repository id
* @return true if repository is currently in use by one of the running snapshots
*/
public static boolean isRepositoryInUse(ClusterState clusterState, String repository) {
SnapshotsInProgress snapshots = clusterState.custom(SnapshotsInProgress.TYPE);
if (snapshots != null) {
for (SnapshotsInProgress.Entry snapshot : snapshots.entries()) {
if (repository.equals(snapshot.snapshot().getRepository())) {
return true;
}
}
}
SnapshotDeletionsInProgress deletionsInProgress = clusterState.custom(SnapshotDeletionsInProgress.TYPE);
if (deletionsInProgress != null) {
for (SnapshotDeletionsInProgress.Entry entry : deletionsInProgress.getEntries()) {
if (entry.getSnapshot().getRepository().equals(repository)) {
return true;
}
}
}
return false;
}
/**
* Deletes snapshot from repository
*
* @param snapshot snapshot
* @param listener listener
* @param repositoryStateId the unique id representing the state of the repository at the time the deletion began
*/
private void deleteSnapshotFromRepository(final Snapshot snapshot, @Nullable final DeleteSnapshotListener listener,
long repositoryStateId) {
threadPool.executor(ThreadPool.Names.SNAPSHOT).execute(() -> {
try {
Repository repository = repositoriesService.repository(snapshot.getRepository());
repository.deleteSnapshot(snapshot.getSnapshotId(), repositoryStateId);
removeSnapshotDeletionFromClusterState(snapshot, null, listener);
} catch (Exception ex) {
removeSnapshotDeletionFromClusterState(snapshot, ex, listener);
}
});
}
/**
* Removes the snapshot deletion from {@link SnapshotDeletionsInProgress} in the cluster state.
*/
private void removeSnapshotDeletionFromClusterState(final Snapshot snapshot, @Nullable final Exception failure,
@Nullable final DeleteSnapshotListener listener) {
clusterService.submitStateUpdateTask("remove snapshot deletion metadata", new ClusterStateUpdateTask() {
@Override
public ClusterState execute(ClusterState currentState) {
SnapshotDeletionsInProgress deletions = currentState.custom(SnapshotDeletionsInProgress.TYPE);
if (deletions != null) {
boolean changed = false;
if (deletions.hasDeletionsInProgress()) {
assert deletions.getEntries().size() == 1 : "should have exactly one deletion in progress";
SnapshotDeletionsInProgress.Entry entry = deletions.getEntries().get(0);
deletions = deletions.withRemovedEntry(entry);
changed = true;
}
if (changed) {
return ClusterState.builder(currentState).putCustom(SnapshotDeletionsInProgress.TYPE, deletions).build();
}
}
return currentState;
}
@Override
public void onFailure(String source, Exception e) {
logger.warn((Supplier<?>) () -> new ParameterizedMessage("[{}] failed to remove snapshot deletion metadata", snapshot), e);
if (listener != null) {
listener.onFailure(e);
}
}
@Override
public void clusterStateProcessed(String source, ClusterState oldState, ClusterState newState) {
if (listener != null) {
if (failure != null) {
listener.onFailure(failure);
} else {
listener.onResponse();
}
}
}
});
}
/**
* Calculates the list of shards that should be included into the current snapshot
*
* @param clusterState cluster state
* @param indices list of indices to be snapshotted
* @return list of shard to be included into current snapshot
*/
private ImmutableOpenMap<ShardId, SnapshotsInProgress.ShardSnapshotStatus> shards(ClusterState clusterState, List<IndexId> indices) {
ImmutableOpenMap.Builder<ShardId, SnapshotsInProgress.ShardSnapshotStatus> builder = ImmutableOpenMap.builder();
MetaData metaData = clusterState.metaData();
for (IndexId index : indices) {
final String indexName = index.getName();
IndexMetaData indexMetaData = metaData.index(indexName);
if (indexMetaData == null) {
// The index was deleted before we managed to start the snapshot - mark it as missing.
builder.put(new ShardId(indexName, IndexMetaData.INDEX_UUID_NA_VALUE, 0), new SnapshotsInProgress.ShardSnapshotStatus(null, State.MISSING, "missing index"));
} else if (indexMetaData.getState() == IndexMetaData.State.CLOSE) {
for (int i = 0; i < indexMetaData.getNumberOfShards(); i++) {
ShardId shardId = new ShardId(indexMetaData.getIndex(), i);
builder.put(shardId, new SnapshotsInProgress.ShardSnapshotStatus(null, State.MISSING, "index is closed"));
}
} else {
IndexRoutingTable indexRoutingTable = clusterState.getRoutingTable().index(indexName);
for (int i = 0; i < indexMetaData.getNumberOfShards(); i++) {
ShardId shardId = new ShardId(indexMetaData.getIndex(), i);
if (indexRoutingTable != null) {
ShardRouting primary = indexRoutingTable.shard(i).primaryShard();
if (primary == null || !primary.assignedToNode()) {
builder.put(shardId, new SnapshotsInProgress.ShardSnapshotStatus(null, State.MISSING, "primary shard is not allocated"));
} else if (primary.relocating() || primary.initializing()) {
// The WAITING state was introduced in V1.2.0 - don't use it if there are nodes with older version in the cluster
builder.put(shardId, new SnapshotsInProgress.ShardSnapshotStatus(primary.currentNodeId(), State.WAITING));
} else if (!primary.started()) {
builder.put(shardId, new SnapshotsInProgress.ShardSnapshotStatus(primary.currentNodeId(), State.MISSING, "primary shard hasn't been started yet"));
} else {
builder.put(shardId, new SnapshotsInProgress.ShardSnapshotStatus(primary.currentNodeId()));
}
} else {
builder.put(shardId, new SnapshotsInProgress.ShardSnapshotStatus(null, State.MISSING, "missing routing table"));
}
}
}
}
return builder.build();
}
/**
* Check if any of the indices to be deleted are currently being snapshotted. Fail as deleting an index that is being
* snapshotted (with partial == false) makes the snapshot fail.
*/
public static void checkIndexDeletion(ClusterState currentState, Set<IndexMetaData> indices) {
Set<Index> indicesToFail = indicesToFailForCloseOrDeletion(currentState, indices);
if (indicesToFail != null) {
throw new IllegalArgumentException("Cannot delete indices that are being snapshotted: " + indicesToFail +
". Try again after snapshot finishes or cancel the currently running snapshot.");
}
}
/**
* Check if any of the indices to be closed are currently being snapshotted. Fail as closing an index that is being
* snapshotted (with partial == false) makes the snapshot fail.
*/
public static void checkIndexClosing(ClusterState currentState, Set<IndexMetaData> indices) {
Set<Index> indicesToFail = indicesToFailForCloseOrDeletion(currentState, indices);
if (indicesToFail != null) {
throw new IllegalArgumentException("Cannot close indices that are being snapshotted: " + indicesToFail +
". Try again after snapshot finishes or cancel the currently running snapshot.");
}
}
private static Set<Index> indicesToFailForCloseOrDeletion(ClusterState currentState, Set<IndexMetaData> indices) {
SnapshotsInProgress snapshots = currentState.custom(SnapshotsInProgress.TYPE);
Set<Index> indicesToFail = null;
if (snapshots != null) {
for (final SnapshotsInProgress.Entry entry : snapshots.entries()) {
if (entry.partial() == false) {
if (entry.state() == State.INIT) {
for (IndexId index : entry.indices()) {
IndexMetaData indexMetaData = currentState.metaData().index(index.getName());
if (indexMetaData != null && indices.contains(indexMetaData)) {
if (indicesToFail == null) {
indicesToFail = new HashSet<>();
}
indicesToFail.add(indexMetaData.getIndex());
}
}
} else {
for (ObjectObjectCursor<ShardId, SnapshotsInProgress.ShardSnapshotStatus> shard : entry.shards()) {
if (!shard.value.state().completed()) {
IndexMetaData indexMetaData = currentState.metaData().index(shard.key.getIndex());
if (indexMetaData != null && indices.contains(indexMetaData)) {
if (indicesToFail == null) {
indicesToFail = new HashSet<>();
}
indicesToFail.add(shard.key.getIndex());
}
}
}
}
}
}
}
return indicesToFail;
}
/**
* Adds snapshot completion listener
*
* @param listener listener
*/
public void addListener(SnapshotCompletionListener listener) {
this.snapshotCompletionListeners.add(listener);
}
/**
* Removes snapshot completion listener
*
* @param listener listener
*/
public void removeListener(SnapshotCompletionListener listener) {
this.snapshotCompletionListeners.remove(listener);
}
@Override
protected void doStart() {
}
@Override
protected void doStop() {
}
@Override
protected void doClose() {
clusterService.removeApplier(this);
}
public RepositoriesService getRepositoriesService() {
return repositoriesService;
}
/**
* Listener for create snapshot operation
*/
public interface CreateSnapshotListener {
/**
* Called when snapshot has successfully started
*/
void onResponse();
/**
* Called if a snapshot operation couldn't start
*/
void onFailure(Exception e);
}
/**
* Listener for delete snapshot operation
*/
public interface DeleteSnapshotListener {
/**
* Called if delete operation was successful
*/
void onResponse();
/**
* Called if delete operation failed
*/
void onFailure(Exception e);
}
public interface SnapshotCompletionListener {
void onSnapshotCompletion(Snapshot snapshot, SnapshotInfo snapshotInfo);
void onSnapshotFailure(Snapshot snapshot, Exception e);
}
/**
* Snapshot creation request
*/
public static class SnapshotRequest {
private final String cause;
private final String repositoryName;
private final String snapshotName;
private String[] indices;
private IndicesOptions indicesOptions = IndicesOptions.strictExpandOpen();
private boolean partial;
private Settings settings;
private boolean includeGlobalState;
private TimeValue masterNodeTimeout;
/**
* Constructs new snapshot creation request
*
* @param repositoryName repository name
* @param snapshotName snapshot name
* @param cause cause for snapshot operation
*/
public SnapshotRequest(final String repositoryName, final String snapshotName, final String cause) {
this.repositoryName = Objects.requireNonNull(repositoryName);
this.snapshotName = Objects.requireNonNull(snapshotName);
this.cause = Objects.requireNonNull(cause);
}
/**
* Sets the list of indices to be snapshotted
*
* @param indices list of indices
* @return this request
*/
public SnapshotRequest indices(String[] indices) {
this.indices = indices;
return this;
}
/**
* Sets repository-specific snapshot settings
*
* @param settings snapshot settings
* @return this request
*/
public SnapshotRequest settings(Settings settings) {
this.settings = settings;
return this;
}
/**
* Set to true if global state should be stored as part of the snapshot
*
* @param includeGlobalState true if global state should be stored as part of the snapshot
* @return this request
*/
public SnapshotRequest includeGlobalState(boolean includeGlobalState) {
this.includeGlobalState = includeGlobalState;
return this;
}
/**
* Sets master node timeout
*
* @param masterNodeTimeout master node timeout
* @return this request
*/
public SnapshotRequest masterNodeTimeout(TimeValue masterNodeTimeout) {
this.masterNodeTimeout = masterNodeTimeout;
return this;
}
/**
* Sets the indices options
*
* @param indicesOptions indices options
* @return this request
*/
public SnapshotRequest indicesOptions(IndicesOptions indicesOptions) {
this.indicesOptions = indicesOptions;
return this;
}
/**
* Set to true if partial snapshot should be allowed
*
* @param partial true if partial snapshots should be allowed
* @return this request
*/
public SnapshotRequest partial(boolean partial) {
this.partial = partial;
return this;
}
/**
* Returns cause for snapshot operation
*
* @return cause for snapshot operation
*/
public String cause() {
return cause;
}
/**
* Returns the repository name
*/
public String repositoryName() {
return repositoryName;
}
/**
* Returns the snapshot name
*/
public String snapshotName() {
return snapshotName;
}
/**
* Returns the list of indices to be snapshotted
*
* @return the list of indices
*/
public String[] indices() {
return indices;
}
/**
* Returns indices options
*
* @return indices options
*/
public IndicesOptions indicesOptions() {
return indicesOptions;
}
/**
* Returns repository-specific settings for the snapshot operation
*
* @return repository-specific settings
*/
public Settings settings() {
return settings;
}
/**
* Returns true if global state should be stored as part of the snapshot
*
* @return true if global state should be stored as part of the snapshot
*/
public boolean includeGlobalState() {
return includeGlobalState;
}
/**
* Returns true if partial snapshot should be allowed
*
* @return true if partial snapshot should be allowed
*/
public boolean partial() {
return partial;
}
/**
* Returns master node timeout
*
* @return master node timeout
*/
public TimeValue masterNodeTimeout() {
return masterNodeTimeout;
}
}
}