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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 java.io.IOException;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span><a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import org.apache.hadoop.conf.Configuration;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import org.apache.hadoop.hbase.Abortable;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.hadoop.hbase.zookeeper.ZKNodeTracker;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.zookeeper.ZNodePaths;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.zookeeper.ZKWatcher;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.client.MasterSwitchType;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.exceptions.DeserializationException;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ZooKeeperProtos.SwitchState;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.apache.zookeeper.KeeperException;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span><a name="line.35"></a> |
| <span class="sourceLineNo">036</span><a name="line.36"></a> |
| <span class="sourceLineNo">037</span>/**<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * Tracks the switch of split and merge states in ZK<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> */<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>@InterfaceAudience.Private<a name="line.40"></a> |
| <span class="sourceLineNo">041</span>public class SplitOrMergeTracker {<a name="line.41"></a> |
| <span class="sourceLineNo">042</span><a name="line.42"></a> |
| <span class="sourceLineNo">043</span> private String splitZnode;<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> private String mergeZnode;<a name="line.44"></a> |
| <span class="sourceLineNo">045</span><a name="line.45"></a> |
| <span class="sourceLineNo">046</span> private SwitchStateTracker splitStateTracker;<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> private SwitchStateTracker mergeStateTracker;<a name="line.47"></a> |
| <span class="sourceLineNo">048</span><a name="line.48"></a> |
| <span class="sourceLineNo">049</span> public SplitOrMergeTracker(ZKWatcher watcher, Configuration conf,<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> Abortable abortable) {<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> try {<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> if (ZKUtil.checkExists(watcher, watcher.getZNodePaths().switchZNode) < 0) {<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> ZKUtil.createAndFailSilent(watcher, watcher.getZNodePaths().switchZNode);<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> }<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> } catch (KeeperException e) {<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> throw new RuntimeException(e);<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> }<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> splitZnode = ZNodePaths.joinZNode(watcher.getZNodePaths().switchZNode,<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> conf.get("zookeeper.znode.switch.split", "split"));<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> mergeZnode = ZNodePaths.joinZNode(watcher.getZNodePaths().switchZNode,<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> conf.get("zookeeper.znode.switch.merge", "merge"));<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> splitStateTracker = new SwitchStateTracker(watcher, splitZnode, abortable);<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> mergeStateTracker = new SwitchStateTracker(watcher, mergeZnode, abortable);<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> }<a name="line.64"></a> |
| <span class="sourceLineNo">065</span><a name="line.65"></a> |
| <span class="sourceLineNo">066</span> public void start() {<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> splitStateTracker.start();<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> mergeStateTracker.start();<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> public boolean isSplitOrMergeEnabled(MasterSwitchType switchType) {<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> switch (switchType) {<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> case SPLIT:<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> return splitStateTracker.isSwitchEnabled();<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> case MERGE:<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> return mergeStateTracker.isSwitchEnabled();<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> default:<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> break;<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> }<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> return false;<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> }<a name="line.81"></a> |
| <span class="sourceLineNo">082</span><a name="line.82"></a> |
| <span class="sourceLineNo">083</span> public void setSplitOrMergeEnabled(boolean enabled, MasterSwitchType switchType)<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> throws KeeperException {<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> switch (switchType) {<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> case SPLIT:<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> splitStateTracker.setSwitchEnabled(enabled);<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> break;<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> case MERGE:<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> mergeStateTracker.setSwitchEnabled(enabled);<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> break;<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> default:<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> break;<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> }<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> }<a name="line.95"></a> |
| <span class="sourceLineNo">096</span><a name="line.96"></a> |
| <span class="sourceLineNo">097</span> private static class SwitchStateTracker extends ZKNodeTracker {<a name="line.97"></a> |
| <span class="sourceLineNo">098</span><a name="line.98"></a> |
| <span class="sourceLineNo">099</span> public SwitchStateTracker(ZKWatcher watcher, String node, Abortable abortable) {<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> super(watcher, node, abortable);<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> }<a name="line.101"></a> |
| <span class="sourceLineNo">102</span><a name="line.102"></a> |
| <span class="sourceLineNo">103</span> /**<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> * Return true if the switch is on, false otherwise<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> */<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> public boolean isSwitchEnabled() {<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> byte [] upData = super.getData(false);<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> try {<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> // if data in ZK is null, use default of on.<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> return upData == null || parseFrom(upData).getEnabled();<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> } catch (DeserializationException dex) {<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> LOG.error("ZK state for LoadBalancer could not be parsed " + Bytes.toStringBinary(upData));<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> // return false to be safe.<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> return false;<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> }<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> }<a name="line.116"></a> |
| <span class="sourceLineNo">117</span><a name="line.117"></a> |
| <span class="sourceLineNo">118</span> /**<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> * Set the switch on/off<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> * @param enabled switch enabled or not?<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> * @throws KeeperException keepException will be thrown out<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> */<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> public void setSwitchEnabled(boolean enabled) throws KeeperException {<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> byte [] upData = toByteArray(enabled);<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> try {<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> ZKUtil.setData(watcher, node, upData);<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> } catch(KeeperException.NoNodeException nne) {<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> ZKUtil.createAndWatch(watcher, node, upData);<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> }<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> super.nodeDataChanged(node);<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> }<a name="line.131"></a> |
| <span class="sourceLineNo">132</span><a name="line.132"></a> |
| <span class="sourceLineNo">133</span> private byte [] toByteArray(boolean enabled) {<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> SwitchState.Builder builder = SwitchState.newBuilder();<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> builder.setEnabled(enabled);<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> return ProtobufUtil.prependPBMagic(builder.build().toByteArray());<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> }<a name="line.137"></a> |
| <span class="sourceLineNo">138</span><a name="line.138"></a> |
| <span class="sourceLineNo">139</span> private SwitchState parseFrom(byte [] bytes)<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> throws DeserializationException {<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> ProtobufUtil.expectPBMagicPrefix(bytes);<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> SwitchState.Builder builder = SwitchState.newBuilder();<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> try {<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> int magicLen = ProtobufUtil.lengthOfPBMagic();<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> ProtobufUtil.mergeFrom(builder, bytes, magicLen, bytes.length - magicLen);<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> } catch (IOException e) {<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> throw new DeserializationException(e);<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> }<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> return builder.build();<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> }<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> }<a name="line.151"></a> |
| <span class="sourceLineNo">152</span>}<a name="line.152"></a> |
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| </pre> |
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