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*
* 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.master;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import java.io.IOException;
import java.util.List;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.ClusterStatus;
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.MetaTableAccessor;
import org.apache.hadoop.hbase.MiniHBaseCluster;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.RegionLocator;
import org.apache.hadoop.hbase.master.RegionState.State;
import org.apache.hadoop.hbase.protobuf.RequestConverter;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.regionserver.HRegionServer;
import org.apache.hadoop.hbase.testclassification.FlakeyTests;
import org.apache.hadoop.hbase.testclassification.LargeTests;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.FSTableDescriptors;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.hbase.util.JVMClusterUtil.MasterThread;
import org.apache.hadoop.hbase.zookeeper.MetaTableLocator;
import org.junit.Test;
import org.junit.experimental.categories.Category;
@Category({FlakeyTests.class, LargeTests.class})
public class TestMasterFailover {
private static final Log LOG = LogFactory.getLog(TestMasterFailover.class);
HRegion createRegion(final HRegionInfo hri, final Path rootdir, final Configuration c,
final HTableDescriptor htd)
throws IOException {
HRegion r = HRegion.createHRegion(hri, rootdir, c, htd);
// The above call to create a region will create an hlog file. Each
// log file create will also create a running thread to do syncing. We need
// to close out this log else we will have a running thread trying to sync
// the file system continuously which is ugly when dfs is taken away at the
// end of the test.
HRegion.closeHRegion(r);
return r;
}
// TODO: Next test to add is with testing permutations of the RIT or the RS
// killed are hosting ROOT and hbase:meta regions.
private void log(String string) {
LOG.info("\n\n" + string + " \n\n");
}
/**
* Simple test of master failover.
* <p>
* Starts with three masters. Kills a backup master. Then kills the active
* master. Ensures the final master becomes active and we can still contact
* the cluster.
* @throws Exception
*/
@Test (timeout=240000)
public void testSimpleMasterFailover() throws Exception {
final int NUM_MASTERS = 3;
final int NUM_RS = 3;
// Start the cluster
HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
TEST_UTIL.startMiniCluster(NUM_MASTERS, NUM_RS);
MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
// get all the master threads
List<MasterThread> masterThreads = cluster.getMasterThreads();
// wait for each to come online
for (MasterThread mt : masterThreads) {
assertTrue(mt.isAlive());
}
// verify only one is the active master and we have right number
int numActive = 0;
int activeIndex = -1;
ServerName activeName = null;
HMaster active = null;
for (int i = 0; i < masterThreads.size(); i++) {
if (masterThreads.get(i).getMaster().isActiveMaster()) {
numActive++;
activeIndex = i;
active = masterThreads.get(activeIndex).getMaster();
activeName = active.getServerName();
}
}
assertEquals(1, numActive);
assertEquals(NUM_MASTERS, masterThreads.size());
LOG.info("Active master " + activeName);
// Check that ClusterStatus reports the correct active and backup masters
assertNotNull(active);
ClusterStatus status = active.getClusterStatus();
assertTrue(status.getMaster().equals(activeName));
assertEquals(2, status.getBackupMastersSize());
assertEquals(2, status.getBackupMasters().size());
// attempt to stop one of the inactive masters
int backupIndex = (activeIndex == 0 ? 1 : activeIndex - 1);
HMaster master = cluster.getMaster(backupIndex);
LOG.debug("\n\nStopping a backup master: " + master.getServerName() + "\n");
cluster.stopMaster(backupIndex, false);
cluster.waitOnMaster(backupIndex);
// Verify still one active master and it's the same
for (int i = 0; i < masterThreads.size(); i++) {
if (masterThreads.get(i).getMaster().isActiveMaster()) {
assertTrue(activeName.equals(masterThreads.get(i).getMaster().getServerName()));
activeIndex = i;
active = masterThreads.get(activeIndex).getMaster();
}
}
assertEquals(1, numActive);
assertEquals(2, masterThreads.size());
int rsCount = masterThreads.get(activeIndex).getMaster().getClusterStatus().getServersSize();
LOG.info("Active master " + active.getServerName() + " managing " + rsCount + " regions servers");
assertEquals(4, rsCount);
// Check that ClusterStatus reports the correct active and backup masters
assertNotNull(active);
status = active.getClusterStatus();
assertTrue(status.getMaster().equals(activeName));
assertEquals(1, status.getBackupMastersSize());
assertEquals(1, status.getBackupMasters().size());
// kill the active master
LOG.debug("\n\nStopping the active master " + active.getServerName() + "\n");
cluster.stopMaster(activeIndex, false);
cluster.waitOnMaster(activeIndex);
// wait for an active master to show up and be ready
assertTrue(cluster.waitForActiveAndReadyMaster());
LOG.debug("\n\nVerifying backup master is now active\n");
// should only have one master now
assertEquals(1, masterThreads.size());
// and he should be active
active = masterThreads.get(0).getMaster();
assertNotNull(active);
status = active.getClusterStatus();
ServerName mastername = status.getMaster();
assertTrue(mastername.equals(active.getServerName()));
assertTrue(active.isActiveMaster());
assertEquals(0, status.getBackupMastersSize());
assertEquals(0, status.getBackupMasters().size());
int rss = status.getServersSize();
LOG.info("Active master " + mastername.getServerName() + " managing " +
rss + " region servers");
assertEquals(4, rss);
// Stop the cluster
TEST_UTIL.shutdownMiniCluster();
}
/**
* Test region in pending_open/close when master failover
*/
@Test (timeout=180000)
public void testPendingOpenOrCloseWhenMasterFailover() throws Exception {
final int NUM_MASTERS = 1;
final int NUM_RS = 1;
// Create config to use for this cluster
Configuration conf = HBaseConfiguration.create();
// Start the cluster
HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility(conf);
TEST_UTIL.startMiniCluster(NUM_MASTERS, NUM_RS);
MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
log("Cluster started");
// get all the master threads
List<MasterThread> masterThreads = cluster.getMasterThreads();
assertEquals(1, masterThreads.size());
// only one master thread, let's wait for it to be initialized
assertTrue(cluster.waitForActiveAndReadyMaster());
HMaster master = masterThreads.get(0).getMaster();
assertTrue(master.isActiveMaster());
assertTrue(master.isInitialized());
// Create a table with a region online
RegionLocator onlineTable = TEST_UTIL.createTable(TableName.valueOf("onlineTable"), "family");
// Create a table in META, so it has a region offline
HTableDescriptor offlineTable = new HTableDescriptor(
TableName.valueOf(Bytes.toBytes("offlineTable")));
offlineTable.addFamily(new HColumnDescriptor(Bytes.toBytes("family")));
FileSystem filesystem = FileSystem.get(conf);
Path rootdir = FSUtils.getRootDir(conf);
FSTableDescriptors fstd = new FSTableDescriptors(conf, filesystem, rootdir);
fstd.createTableDescriptor(offlineTable);
HRegionInfo hriOffline = new HRegionInfo(offlineTable.getTableName(), null, null);
createRegion(hriOffline, rootdir, conf, offlineTable);
MetaTableAccessor.addRegionToMeta(master.getShortCircuitConnection(), hriOffline);
log("Regions in hbase:meta and namespace have been created");
// at this point we only expect 3 regions to be assigned out
// (catalogs and namespace, + 1 online region)
assertEquals(3, cluster.countServedRegions());
HRegionInfo hriOnline = onlineTable.getRegionLocation(
HConstants.EMPTY_START_ROW).getRegionInfo();
RegionStates regionStates = master.getAssignmentManager().getRegionStates();
RegionStateStore stateStore = master.getAssignmentManager().getRegionStateStore();
// Put the online region in pending_close. It is actually already opened.
// This is to simulate that the region close RPC is not sent out before failover
RegionState oldState = regionStates.getRegionState(hriOnline);
RegionState newState = new RegionState(
hriOnline, State.PENDING_CLOSE, oldState.getServerName());
stateStore.updateRegionState(HConstants.NO_SEQNUM, newState, oldState);
// Put the offline region in pending_open. It is actually not opened yet.
// This is to simulate that the region open RPC is not sent out before failover
oldState = new RegionState(hriOffline, State.OFFLINE);
newState = new RegionState(hriOffline, State.PENDING_OPEN, newState.getServerName());
stateStore.updateRegionState(HConstants.NO_SEQNUM, newState, oldState);
// Stop the master
log("Aborting master");
cluster.abortMaster(0);
cluster.waitOnMaster(0);
log("Master has aborted");
// Start up a new master
log("Starting up a new master");
master = cluster.startMaster().getMaster();
log("Waiting for master to be ready");
cluster.waitForActiveAndReadyMaster();
log("Master is ready");
// Wait till no region in transition any more
TEST_UTIL.waitUntilNoRegionsInTransition(60000);
// Get new region states since master restarted
regionStates = master.getAssignmentManager().getRegionStates();
// Both pending_open (RPC sent/not yet) regions should be online
assertTrue(regionStates.isRegionOnline(hriOffline));
assertTrue(regionStates.isRegionOnline(hriOnline));
log("Done with verification, shutting down cluster");
// Done, shutdown the cluster
TEST_UTIL.shutdownMiniCluster();
}
/**
* Test meta in transition when master failover
*/
@Test(timeout = 180000)
public void testMetaInTransitionWhenMasterFailover() throws Exception {
final int NUM_MASTERS = 1;
final int NUM_RS = 1;
// Start the cluster
HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();
TEST_UTIL.startMiniCluster(NUM_MASTERS, NUM_RS);
MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
log("Cluster started");
log("Moving meta off the master");
HMaster activeMaster = cluster.getMaster();
HRegionServer rs = cluster.getRegionServer(0);
ServerName metaServerName = cluster.getLiveRegionServerThreads()
.get(0).getRegionServer().getServerName();
activeMaster.move(HRegionInfo.FIRST_META_REGIONINFO.getEncodedNameAsBytes(),
Bytes.toBytes(metaServerName.getServerName()));
TEST_UTIL.waitUntilNoRegionsInTransition(60000);
assertEquals("Meta should be assigned on expected regionserver",
metaServerName, activeMaster.getMetaTableLocator()
.getMetaRegionLocation(activeMaster.getZooKeeper()));
// Now kill master, meta should remain on rs, where we placed it before.
log("Aborting master");
activeMaster.abort("test-kill");
cluster.waitForMasterToStop(activeMaster.getServerName(), 30000);
log("Master has aborted");
// meta should remain where it was
RegionState metaState =
MetaTableLocator.getMetaRegionState(rs.getZooKeeper());
assertEquals("hbase:meta should be onlined on RS",
metaState.getServerName(), rs.getServerName());
assertEquals("hbase:meta should be onlined on RS",
metaState.getState(), State.OPEN);
// Start up a new master
log("Starting up a new master");
activeMaster = cluster.startMaster().getMaster();
log("Waiting for master to be ready");
cluster.waitForActiveAndReadyMaster();
log("Master is ready");
// ensure meta is still deployed on RS
metaState =
MetaTableLocator.getMetaRegionState(activeMaster.getZooKeeper());
assertEquals("hbase:meta should be onlined on RS",
metaState.getServerName(), rs.getServerName());
assertEquals("hbase:meta should be onlined on RS",
metaState.getState(), State.OPEN);
// Update meta state as PENDING_OPEN, then kill master
// that simulates, that RS successfully deployed, but
// RPC was lost right before failure.
// region server should expire (how it can be verified?)
MetaTableLocator.setMetaLocation(activeMaster.getZooKeeper(),
rs.getServerName(), State.PENDING_OPEN);
HRegion meta = rs.getFromOnlineRegions(HRegionInfo.FIRST_META_REGIONINFO.getEncodedName());
rs.removeFromOnlineRegions(meta, null);
meta.close();
log("Aborting master");
activeMaster.abort("test-kill");
cluster.waitForMasterToStop(activeMaster.getServerName(), 30000);
log("Master has aborted");
// Start up a new master
log("Starting up a new master");
activeMaster = cluster.startMaster().getMaster();
log("Waiting for master to be ready");
cluster.waitForActiveAndReadyMaster();
log("Master is ready");
TEST_UTIL.waitUntilNoRegionsInTransition(60000);
log("Meta was assigned");
metaState =
MetaTableLocator.getMetaRegionState(activeMaster.getZooKeeper());
assertEquals("hbase:meta should be onlined on RS",
metaState.getServerName(), rs.getServerName());
assertEquals("hbase:meta should be onlined on RS",
metaState.getState(), State.OPEN);
// Update meta state as PENDING_CLOSE, then kill master
// that simulates, that RS successfully deployed, but
// RPC was lost right before failure.
// region server should expire (how it can be verified?)
MetaTableLocator.setMetaLocation(activeMaster.getZooKeeper(),
rs.getServerName(), State.PENDING_CLOSE);
log("Aborting master");
activeMaster.abort("test-kill");
cluster.waitForMasterToStop(activeMaster.getServerName(), 30000);
log("Master has aborted");
rs.getRSRpcServices().closeRegion(null, RequestConverter.buildCloseRegionRequest(
rs.getServerName(), HRegionInfo.FIRST_META_REGIONINFO.getEncodedName()));
// Start up a new master
log("Starting up a new master");
activeMaster = cluster.startMaster().getMaster();
log("Waiting for master to be ready");
cluster.waitForActiveAndReadyMaster();
log("Master is ready");
TEST_UTIL.waitUntilNoRegionsInTransition(60000);
log("Meta was assigned");
// Done, shutdown the cluster
TEST_UTIL.shutdownMiniCluster();
}
}