/**
*
* 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.hadoop.hbase.coprocessor;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.NavigableSet;
import java.util.concurrent.CountDownLatch;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.Coprocessor;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HBaseTestingUtility;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.HRegionInfo;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.testclassification.MediumTests;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Admin;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.IsolationLevel;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.filter.FilterBase;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.regionserver.HStore;
import org.apache.hadoop.hbase.regionserver.InternalScanner;
import org.apache.hadoop.hbase.regionserver.KeyValueScanner;
import org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost;
import org.apache.hadoop.hbase.regionserver.RegionServerServices;
import org.apache.hadoop.hbase.regionserver.ScanType;
import org.apache.hadoop.hbase.regionserver.Store;
import org.apache.hadoop.hbase.regionserver.StoreScanner;
import org.apache.hadoop.hbase.regionserver.compactions.CompactionContext;
import org.apache.hadoop.hbase.wal.WAL;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Test;
import org.junit.experimental.categories.Category;
@Category(MediumTests.class)
public class TestRegionObserverScannerOpenHook {
private static HBaseTestingUtility UTIL = new HBaseTestingUtility();
static final Path DIR = UTIL.getDataTestDir();
public static class NoDataFilter extends FilterBase {
@Override
public ReturnCode filterKeyValue(Cell ignored) throws IOException {
return ReturnCode.SKIP;
}
@Override
public boolean filterAllRemaining() throws IOException {
return true;
}
@Override
public boolean filterRow() throws IOException {
return true;
}
}
/**
* Do the same logic as the {@link BaseRegionObserver}. Needed since {@link BaseRegionObserver} is
* an abstract class.
*/
public static class EmptyRegionObsever extends BaseRegionObserver {
}
/**
* Don't return any data from a scan by creating a custom {@link StoreScanner}.
*/
public static class NoDataFromScan extends BaseRegionObserver {
@Override
public KeyValueScanner preStoreScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c,
Store store, Scan scan, NavigableSet<byte[]> targetCols, KeyValueScanner s)
throws IOException {
scan.setFilter(new NoDataFilter());
return new StoreScanner(store, store.getScanInfo(), scan, targetCols,
((HStore)store).getHRegion().getReadpoint(IsolationLevel.READ_COMMITTED));
}
}
/**
* Don't allow any data in a flush by creating a custom {@link StoreScanner}.
*/
public static class NoDataFromFlush extends BaseRegionObserver {
@Override
public InternalScanner preFlushScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c,
Store store, KeyValueScanner memstoreScanner, InternalScanner s) throws IOException {
Scan scan = new Scan();
scan.setFilter(new NoDataFilter());
return new StoreScanner(store, store.getScanInfo(), scan,
Collections.singletonList(memstoreScanner), ScanType.COMPACT_RETAIN_DELETES,
store.getSmallestReadPoint(), HConstants.OLDEST_TIMESTAMP);
}
}
/**
* Don't allow any data to be written out in the compaction by creating a custom
* {@link StoreScanner}.
*/
public static class NoDataFromCompaction extends BaseRegionObserver {
@Override
public InternalScanner preCompactScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c,
Store store, List<? extends KeyValueScanner> scanners, ScanType scanType,
long earliestPutTs, InternalScanner s) throws IOException {
Scan scan = new Scan();
scan.setFilter(new NoDataFilter());
return new StoreScanner(store, store.getScanInfo(), scan, scanners,
ScanType.COMPACT_RETAIN_DELETES, store.getSmallestReadPoint(),
HConstants.OLDEST_TIMESTAMP);
}
}
HRegion initHRegion(byte[] tableName, String callingMethod, Configuration conf,
byte[]... families) throws IOException {
HTableDescriptor htd = new HTableDescriptor(TableName.valueOf(tableName));
for (byte[] family : families) {
htd.addFamily(new HColumnDescriptor(family));
}
HRegionInfo info = new HRegionInfo(htd.getTableName(), null, null, false);
Path path = new Path(DIR + callingMethod);
HRegion r = HRegion.createHRegion(info, path, conf, htd);
// this following piece is a hack. currently a coprocessorHost
// is secretly loaded at OpenRegionHandler. we don't really
// start a region server here, so just manually create cphost
// and set it to region.
RegionCoprocessorHost host = new RegionCoprocessorHost(r, null, conf);
r.setCoprocessorHost(host);
return r;
}
@Test
public void testRegionObserverScanTimeStacking() throws Exception {
byte[] ROW = Bytes.toBytes("testRow");
byte[] TABLE = Bytes.toBytes(getClass().getName());
byte[] A = Bytes.toBytes("A");
byte[][] FAMILIES = new byte[][] { A };
Configuration conf = HBaseConfiguration.create();
HRegion region = initHRegion(TABLE, getClass().getName(), conf, FAMILIES);
RegionCoprocessorHost h = region.getCoprocessorHost();
h.load(NoDataFromScan.class, Coprocessor.PRIORITY_HIGHEST, conf);
h.load(EmptyRegionObsever.class, Coprocessor.PRIORITY_USER, conf);
Put put = new Put(ROW);
put.add(A, A, A);
region.put(put);
Get get = new Get(ROW);
Result r = region.get(get);
assertNull(
"Got an unexpected number of rows - no data should be returned with the NoDataFromScan coprocessor. Found: "
+ r, r.listCells());
}
@Test
public void testRegionObserverFlushTimeStacking() throws Exception {
byte[] ROW = Bytes.toBytes("testRow");
byte[] TABLE = Bytes.toBytes(getClass().getName());
byte[] A = Bytes.toBytes("A");
byte[][] FAMILIES = new byte[][] { A };
Configuration conf = HBaseConfiguration.create();
HRegion region = initHRegion(TABLE, getClass().getName(), conf, FAMILIES);
RegionCoprocessorHost h = region.getCoprocessorHost();
h.load(NoDataFromFlush.class, Coprocessor.PRIORITY_HIGHEST, conf);
h.load(EmptyRegionObsever.class, Coprocessor.PRIORITY_USER, conf);
// put a row and flush it to disk
Put put = new Put(ROW);
put.add(A, A, A);
region.put(put);
region.flushcache();
Get get = new Get(ROW);
Result r = region.get(get);
assertNull(
"Got an unexpected number of rows - no data should be returned with the NoDataFromScan coprocessor. Found: "
+ r, r.listCells());
}
/*
* Custom HRegion which uses CountDownLatch to signal the completion of compaction
*/
public static class CompactionCompletionNotifyingRegion extends HRegion {
private static volatile CountDownLatch compactionStateChangeLatch = null;
@SuppressWarnings("deprecation")
public CompactionCompletionNotifyingRegion(Path tableDir, WAL log,
FileSystem fs, Configuration confParam, HRegionInfo info,
HTableDescriptor htd, RegionServerServices rsServices) {
super(tableDir, log, fs, confParam, info, htd, rsServices);
}
public CountDownLatch getCompactionStateChangeLatch() {
if (compactionStateChangeLatch == null) compactionStateChangeLatch = new CountDownLatch(1);
return compactionStateChangeLatch;
}
@Override
public boolean compact(CompactionContext compaction, Store store) throws IOException {
boolean ret = super.compact(compaction, store);
if (ret) compactionStateChangeLatch.countDown();
return ret;
}
}
/**
* Unfortunately, the easiest way to test this is to spin up a mini-cluster since we want to do
* the usual compaction mechanism on the region, rather than going through the backdoor to the
* region
*/
@Test
public void testRegionObserverCompactionTimeStacking() throws Exception {
// setup a mini cluster so we can do a real compaction on a region
Configuration conf = UTIL.getConfiguration();
conf.setClass(HConstants.REGION_IMPL, CompactionCompletionNotifyingRegion.class, HRegion.class);
conf.setInt("hbase.hstore.compaction.min", 2);
UTIL.startMiniCluster();
String tableName = "testRegionObserverCompactionTimeStacking";
byte[] ROW = Bytes.toBytes("testRow");
byte[] A = Bytes.toBytes("A");
HTableDescriptor desc = new HTableDescriptor(TableName.valueOf(tableName));
desc.addFamily(new HColumnDescriptor(A));
desc.addCoprocessor(EmptyRegionObsever.class.getName(), null, Coprocessor.PRIORITY_USER, null);
desc.addCoprocessor(NoDataFromCompaction.class.getName(), null, Coprocessor.PRIORITY_HIGHEST,
null);
Admin admin = UTIL.getHBaseAdmin();
admin.createTable(desc);
Table table = new HTable(conf, desc.getTableName());
// put a row and flush it to disk
Put put = new Put(ROW);
put.add(A, A, A);
table.put(put);
HRegionServer rs = UTIL.getRSForFirstRegionInTable(desc.getTableName());
List<HRegion> regions = rs.getOnlineRegions(desc.getTableName());
assertEquals("More than 1 region serving test table with 1 row", 1, regions.size());
HRegion region = regions.get(0);
admin.flushRegion(region.getRegionName());
CountDownLatch latch = ((CompactionCompletionNotifyingRegion)region)
.getCompactionStateChangeLatch();
// put another row and flush that too
put = new Put(Bytes.toBytes("anotherrow"));
put.add(A, A, A);
table.put(put);
admin.flushRegion(region.getRegionName());
// run a compaction, which normally would should get rid of the data
// wait for the compaction checker to complete
latch.await();
// check both rows to ensure that they aren't there
Get get = new Get(ROW);
Result r = table.get(get);
assertNull(
"Got an unexpected number of rows - no data should be returned with the NoDataFromScan coprocessor. Found: "
+ r, r.listCells());
get = new Get(Bytes.toBytes("anotherrow"));
r = table.get(get);
assertNull(
"Got an unexpected number of rows - no data should be returned with the NoDataFromScan coprocessor Found: "
+ r, r.listCells());
table.close();
UTIL.shutdownMiniCluster();
}
}