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| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> */<a name="line.17"></a> |
| <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.master;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import static org.apache.hadoop.hbase.master.region.MasterRegionFactory.STATE_FAMILY;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span><a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.io.IOException;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.client.Get;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.client.Put;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.client.Result;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.master.region.MasterRegion;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.zookeeper.ZKWatcher;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.zookeeper.KeeperException;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.slf4j.Logger;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.slf4j.LoggerFactory;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span><a name="line.34"></a> |
| <span class="sourceLineNo">035</span>/**<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> * A state storage which stores the state in master local region.<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * <p/><a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * We used to store some persistent state on zookeeper, so here we provide the ability to migrate<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> * the state from zookeeper.<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * <p/><a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * Since parsing the state may introduce some extra overhead, we make this class abstract and the<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> * get and set state methods protected. Sub classes should store their state in decoded format to<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * save the extra parsing overhead.<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> */<a name="line.44"></a> |
| <span class="sourceLineNo">045</span>@InterfaceAudience.Private<a name="line.45"></a> |
| <span class="sourceLineNo">046</span>public abstract class MasterStateStore {<a name="line.46"></a> |
| <span class="sourceLineNo">047</span><a name="line.47"></a> |
| <span class="sourceLineNo">048</span> private static final Logger LOG = LoggerFactory.getLogger(MasterStateStore.class);<a name="line.48"></a> |
| <span class="sourceLineNo">049</span><a name="line.49"></a> |
| <span class="sourceLineNo">050</span> private static final byte[] QUALIFIER = Bytes.toBytes("d");<a name="line.50"></a> |
| <span class="sourceLineNo">051</span><a name="line.51"></a> |
| <span class="sourceLineNo">052</span> private final MasterRegion masterRegion;<a name="line.52"></a> |
| <span class="sourceLineNo">053</span><a name="line.53"></a> |
| <span class="sourceLineNo">054</span> private final byte[] stateName;<a name="line.54"></a> |
| <span class="sourceLineNo">055</span><a name="line.55"></a> |
| <span class="sourceLineNo">056</span> protected MasterStateStore(MasterRegion masterRegion, String stateName, ZKWatcher watcher,<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> String zkPath) throws IOException, KeeperException {<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> this.masterRegion = masterRegion;<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> this.stateName = Bytes.toBytes(stateName);<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> tryMigrate(watcher, zkPath);<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> }<a name="line.61"></a> |
| <span class="sourceLineNo">062</span><a name="line.62"></a> |
| <span class="sourceLineNo">063</span> protected final byte[] getState() throws IOException {<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> return get().getValue(STATE_FAMILY, QUALIFIER);<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> }<a name="line.65"></a> |
| <span class="sourceLineNo">066</span><a name="line.66"></a> |
| <span class="sourceLineNo">067</span> protected final void setState(byte[] state) throws IOException {<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> update(state);<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> }<a name="line.69"></a> |
| <span class="sourceLineNo">070</span><a name="line.70"></a> |
| <span class="sourceLineNo">071</span> private Result get() throws IOException {<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> return masterRegion.get(new Get(stateName).addColumn(STATE_FAMILY, QUALIFIER));<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> }<a name="line.73"></a> |
| <span class="sourceLineNo">074</span><a name="line.74"></a> |
| <span class="sourceLineNo">075</span> private void update(byte[] s) throws IOException {<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> masterRegion.update(r -> r.put(new Put(stateName).addColumn(STATE_FAMILY, QUALIFIER, s)));<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> }<a name="line.77"></a> |
| <span class="sourceLineNo">078</span><a name="line.78"></a> |
| <span class="sourceLineNo">079</span> private byte[] migrate(ZKWatcher watcher, String zkPath) throws KeeperException, IOException {<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> byte[] zkData = ZKUtil.getDataNoWatch(watcher, zkPath, null);<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> if (zkData == null || zkData.length == 0) {<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> return null;<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> }<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> update(zkData);<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> return zkData;<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> }<a name="line.86"></a> |
| <span class="sourceLineNo">087</span><a name="line.87"></a> |
| <span class="sourceLineNo">088</span> private void tryMigrate(ZKWatcher watcher, String zkPath) throws IOException, KeeperException {<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> if (zkPath == null) {<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> // this means we do not store this state in zk, skip migrating<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> return;<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> }<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> Result result = get();<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> if (result.isEmpty()) {<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> // migrate<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> migrate(watcher, zkPath);<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> }<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> // we may fail in the middle so even if the value is available in master local region, we may<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> // still leave a znode on zookeeper, so always try to delete the znode here since it is not very<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> // expensive<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> try {<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> ZKUtil.deleteNodeFailSilent(watcher, zkPath);<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> } catch (Exception e) {<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> LOG.warn("failed to delete migrated zk state node {}, ignore and continue", zkPath);<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> }<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> }<a name="line.106"></a> |
| <span class="sourceLineNo">107</span>}<a name="line.107"></a> |
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