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HBASE-27514 Move some persistent states from zookeeper to master regi…
…on (#4925) Signed-off-by: Bryan Beaudreault <[email protected]> Signed-off-by: Peter Somogyi <[email protected]>
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hbase-server/src/main/java/org/apache/hadoop/hbase/master/BooleanStateStore.java
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| @@ -0,0 +1,65 @@ | ||
| /* | ||
| * 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; | ||
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|
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| import java.io.IOException; | ||
| import org.apache.hadoop.hbase.exceptions.DeserializationException; | ||
| import org.apache.hadoop.hbase.master.region.MasterRegion; | ||
| import org.apache.hadoop.hbase.zookeeper.ZKWatcher; | ||
| import org.apache.yetus.audience.InterfaceAudience; | ||
| import org.apache.zookeeper.KeeperException; | ||
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| /** | ||
| * Store a boolean state. | ||
| */ | ||
| @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "UG_SYNC_SET_UNSYNC_GET", | ||
| justification = "the flag is volatile") | ||
| @InterfaceAudience.Private | ||
| public abstract class BooleanStateStore extends MasterStateStore { | ||
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| private volatile boolean on; | ||
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| protected BooleanStateStore(MasterRegion masterRegion, String stateName, ZKWatcher watcher, | ||
| String zkPath) throws IOException, KeeperException, DeserializationException { | ||
| super(masterRegion, stateName, watcher, zkPath); | ||
| byte[] state = getState(); | ||
| this.on = state == null || parseFrom(state); | ||
| } | ||
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| /** | ||
| * Returns true if the flag is on, otherwise false | ||
| */ | ||
| public boolean get() { | ||
| return on; | ||
| } | ||
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| /** | ||
| * Set the flag on/off. | ||
| * @param on true if the flag should be on, false otherwise | ||
| * @throws IOException if the operation fails | ||
| */ | ||
| public synchronized void set(boolean on) throws IOException { | ||
| byte[] state = toByteArray(on); | ||
| setState(state); | ||
| this.on = on; | ||
| } | ||
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| protected abstract byte[] toByteArray(boolean on); | ||
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| protected abstract boolean parseFrom(byte[] bytes) throws DeserializationException; | ||
| } |
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