/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.apache.solr.cloud;
import java.lang.invoke.MethodHandles;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.solr.common.SolrException;
import org.apache.solr.common.cloud.ClusterState;
import org.apache.solr.common.cloud.DocCollection;
import org.apache.solr.common.cloud.Replica;
import org.apache.solr.common.cloud.Slice;
import org.apache.solr.common.cloud.ZkNodeProps;
import org.apache.solr.common.cloud.ZkStateReader;
import org.apache.solr.common.params.CoreAdminParams;
import org.apache.solr.common.util.NamedList;
import org.apache.zookeeper.KeeperException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.apache.solr.common.cloud.ZkStateReader.COLLECTION_PROP;
import static org.apache.solr.common.cloud.ZkStateReader.SHARD_ID_PROP;
import static org.apache.solr.common.params.CommonAdminParams.ASYNC;
public class ReplaceNodeCmd implements OverseerCollectionMessageHandler.Cmd {
private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
private final OverseerCollectionMessageHandler ocmh;
public ReplaceNodeCmd(OverseerCollectionMessageHandler ocmh) {
this.ocmh = ocmh;
}
@Override
public void call(ClusterState state, ZkNodeProps message, NamedList results) throws Exception {
ZkStateReader zkStateReader = ocmh.zkStateReader;
ocmh.checkRequired(message, "source", "target");
String source = message.getStr("source");
String target = message.getStr("target");
String async = message.getStr("async");
boolean parallel = message.getBool("parallel", false);
ClusterState clusterState = zkStateReader.getClusterState();
if (!clusterState.liveNodesContain(source)) {
throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "Source Node: " + source + " is not live");
}
if (!clusterState.liveNodesContain(target)) {
throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "Target Node: " + target + " is not live");
}
List<ZkNodeProps> sourceReplicas = getReplicasOfNode(source, clusterState);
List<ZkNodeProps> createdReplicas = new ArrayList<>();
AtomicBoolean anyOneFailed = new AtomicBoolean(false);
CountDownLatch countDownLatch = new CountDownLatch(sourceReplicas.size());
for (ZkNodeProps sourceReplica : sourceReplicas) {
NamedList nl = new NamedList();
log.info("Going to create replica for collection={} shard={} on node={}", sourceReplica.getStr(COLLECTION_PROP), sourceReplica.getStr(SHARD_ID_PROP), target);
ZkNodeProps msg = sourceReplica.plus("parallel", String.valueOf(parallel)).plus(CoreAdminParams.NODE, target);
if(async!=null) msg.getProperties().put(ASYNC, async);
final ZkNodeProps addedReplica = ocmh.addReplica(clusterState,
msg, nl, () -> {
countDownLatch.countDown();
if (nl.get("failure") != null) {
String errorString = String.format(Locale.ROOT, "Failed to create replica for collection=%s shard=%s" +
" on node=%s", sourceReplica.getStr(COLLECTION_PROP), sourceReplica.getStr(SHARD_ID_PROP), target);
log.warn(errorString);
// one replica creation failed. Make the best attempt to
// delete all the replicas created so far in the target
// and exit
synchronized (results) {
results.add("failure", errorString);
anyOneFailed.set(true);
}
} else {
log.debug("Successfully created replica for collection={} shard={} on node={}",
sourceReplica.getStr(COLLECTION_PROP), sourceReplica.getStr(SHARD_ID_PROP), target);
}
});
if (addedReplica != null) {
createdReplicas.add(addedReplica);
}
}
log.debug("Waiting for replace node action to complete");
countDownLatch.await(5, TimeUnit.MINUTES);
log.debug("Finished waiting for replace node action to complete");
if (anyOneFailed.get()) {
log.info("Failed to create some replicas. Cleaning up all replicas on target node");
CountDownLatch cleanupLatch = new CountDownLatch(createdReplicas.size());
for (ZkNodeProps createdReplica : createdReplicas) {
NamedList deleteResult = new NamedList();
try {
ocmh.deleteReplica(zkStateReader.getClusterState(), createdReplica.plus("parallel", "true"), deleteResult, () -> {
cleanupLatch.countDown();
if (deleteResult.get("failure") != null) {
synchronized (results) {
results.add("failure", "Could not cleanup, because of : " + deleteResult.get("failure"));
}
}
});
} catch (KeeperException e) {
cleanupLatch.countDown();
log.warn("Error deleting replica ", e);
} catch (Exception e) {
log.warn("Error deleting replica ", e);
cleanupLatch.countDown();
throw e;
}
}
cleanupLatch.await(5, TimeUnit.MINUTES);
}
// we have reached this far means all replicas could be recreated
//now cleanup the replicas in the source node
DeleteNodeCmd.cleanupReplicas(results, state, sourceReplicas, ocmh, source, async);
results.add("success", "REPLACENODE action completed successfully from : " + source + " to : " + target);
}
static List<ZkNodeProps> getReplicasOfNode(String source, ClusterState state) {
List<ZkNodeProps> sourceReplicas = new ArrayList<>();
for (Map.Entry<String, DocCollection> e : state.getCollectionsMap().entrySet()) {
for (Slice slice : e.getValue().getSlices()) {
for (Replica replica : slice.getReplicas()) {
if (source.equals(replica.getNodeName())) {
ZkNodeProps props = new ZkNodeProps(
COLLECTION_PROP, e.getKey(),
SHARD_ID_PROP, slice.getName(),
ZkStateReader.CORE_NAME_PROP, replica.getCoreName(),
ZkStateReader.REPLICA_PROP, replica.getName(),
CoreAdminParams.NODE, source);
sourceReplicas.add(props
);
}
}
}
}
return sourceReplicas;
}
}