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HBASE-26245 Store region server list in master local region (#4136)
Signed-off-by: Andrew Purtell <[email protected]>
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hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterRegionServerList.java
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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 java.io.IOException; | ||
| import java.io.UncheckedIOException; | ||
| import java.util.HashSet; | ||
| import java.util.Set; | ||
| import org.apache.hadoop.hbase.Abortable; | ||
| import org.apache.hadoop.hbase.HConstants; | ||
| import org.apache.hadoop.hbase.ServerName; | ||
| import org.apache.hadoop.hbase.client.Delete; | ||
| import org.apache.hadoop.hbase.client.Put; | ||
| import org.apache.hadoop.hbase.client.Result; | ||
| import org.apache.hadoop.hbase.client.ResultScanner; | ||
| import org.apache.hadoop.hbase.client.Scan; | ||
| import org.apache.hadoop.hbase.log.HBaseMarkers; | ||
| import org.apache.hadoop.hbase.master.assignment.ServerState; | ||
| import org.apache.hadoop.hbase.master.region.MasterRegion; | ||
| import org.apache.hadoop.hbase.master.region.MasterRegionFactory; | ||
| import org.apache.hadoop.hbase.util.Bytes; | ||
| import org.apache.yetus.audience.InterfaceAudience; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| /** | ||
| * {@link MasterRegion} based {@link RegionServerList}. | ||
| * <p/> | ||
| * This is useful when we want to restart a cluster with only the data on file system, as when | ||
| * restarting, we need to get the previous live region servers for scheduling SCP. Before we have | ||
| * this class, we need to scan the WAL directory on WAL file system to find out the previous live | ||
| * region servers, which means we can not restart a cluster without the previous WAL file system, | ||
| * even if we have flushed all the data. | ||
| * <p/> | ||
| * Please see HBASE-26245 for more details. | ||
| */ | ||
| @InterfaceAudience.Private | ||
| public class MasterRegionServerList implements RegionServerList { | ||
|
|
||
| private static final Logger LOG = LoggerFactory.getLogger(MasterRegionServerList.class); | ||
|
|
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| private final MasterRegion region; | ||
|
|
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| private final Abortable abortable; | ||
|
|
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| public MasterRegionServerList(MasterRegion region, Abortable abortable) { | ||
| this.region = region; | ||
| this.abortable = abortable; | ||
| } | ||
|
|
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| @Override | ||
| public void started(ServerName sn) { | ||
| Put put = | ||
| new Put(Bytes.toBytes(sn.getServerName())).addColumn(MasterRegionFactory.REGION_SERVER_FAMILY, | ||
| HConstants.STATE_QUALIFIER, Bytes.toBytes(ServerState.ONLINE.name())); | ||
| try { | ||
| region.update(r -> r.put(put)); | ||
| } catch (IOException e) { | ||
| LOG.error(HBaseMarkers.FATAL, "Failed to record region server {} as started, aborting...", sn, | ||
| e); | ||
| abortable.abort("Failed to record region server as started"); | ||
| throw new UncheckedIOException(e); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public void expired(ServerName sn) { | ||
| Delete delete = new Delete(Bytes.toBytes(sn.getServerName())) | ||
| .addFamily(MasterRegionFactory.REGION_SERVER_FAMILY); | ||
| try { | ||
| region.update(r -> r.delete(delete)); | ||
| } catch (IOException e) { | ||
| LOG.error(HBaseMarkers.FATAL, "Failed to record region server {} as expired, aborting...", sn, | ||
| e); | ||
| abortable.abort("Failed to record region server as expired"); | ||
| throw new UncheckedIOException(e); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public Set<ServerName> getAll() throws IOException { | ||
| Set<ServerName> rsList = new HashSet<>(); | ||
| try (ResultScanner scanner = | ||
| region.getScanner(new Scan().addFamily(MasterRegionFactory.REGION_SERVER_FAMILY))) { | ||
| for (;;) { | ||
| Result result = scanner.next(); | ||
| if (result == null) { | ||
| break; | ||
| } | ||
| rsList.add(ServerName.valueOf(Bytes.toString(result.getRow()))); | ||
| } | ||
| } | ||
| return rsList; | ||
| } | ||
|
|
||
| } |
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47
hbase-server/src/main/java/org/apache/hadoop/hbase/master/RegionServerList.java
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| @@ -0,0 +1,47 @@ | ||
| /** | ||
| * 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 java.io.IOException; | ||
| import java.util.Set; | ||
| import org.apache.hadoop.hbase.ServerName; | ||
| import org.apache.yetus.audience.InterfaceAudience; | ||
|
|
||
| /** | ||
| * For storing the region server list. | ||
| * <p/> | ||
| * Mainly be used when restarting master, to load the previous active region server list. | ||
| */ | ||
| @InterfaceAudience.Private | ||
| public interface RegionServerList { | ||
|
|
||
| /** | ||
| * Called when a region server join the cluster. | ||
| */ | ||
| void started(ServerName sn); | ||
|
|
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| /** | ||
| * Called when a region server is dead. | ||
| */ | ||
| void expired(ServerName sn); | ||
|
|
||
| /** | ||
| * Get all live region servers. | ||
| */ | ||
| Set<ServerName> getAll() throws IOException; | ||
| } |
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40
hbase-server/src/test/java/org/apache/hadoop/hbase/master/DummyRegionServerListStorage.java
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| @@ -0,0 +1,40 @@ | ||
| /** | ||
| * 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 java.io.IOException; | ||
| import java.util.Collections; | ||
| import java.util.Set; | ||
| import org.apache.hadoop.hbase.ServerName; | ||
|
|
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| public class DummyRegionServerListStorage implements RegionServerList { | ||
|
|
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| @Override | ||
| public void started(ServerName sn) { | ||
| } | ||
|
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| @Override | ||
| public void expired(ServerName sn) { | ||
| } | ||
|
|
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| @Override | ||
| public Set<ServerName> getAll() throws IOException { | ||
| return Collections.emptySet(); | ||
| } | ||
|
|
||
| } |
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