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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.zookeeper;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import org.apache.hadoop.hbase.Abortable;</span> |
| <span class="source-line-no">021</span><span id="line-21">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.zookeeper.KeeperException;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.slf4j.Logger;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">025</span><span id="line-25"></span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.shaded.protobuf.generated.ZooKeeperProtos;</span> |
| <span class="source-line-no">028</span><span id="line-28"></span> |
| <span class="source-line-no">029</span><span id="line-29">/**</span> |
| <span class="source-line-no">030</span><span id="line-30"> * Tracker on cluster settings up in zookeeper. This is not related to</span> |
| <span class="source-line-no">031</span><span id="line-31"> * {@link org.apache.hadoop.hbase.ClusterMetrics}. That class is a data structure that holds</span> |
| <span class="source-line-no">032</span><span id="line-32"> * snapshot of current view on cluster. This class is about tracking cluster attributes up in</span> |
| <span class="source-line-no">033</span><span id="line-33"> * zookeeper.</span> |
| <span class="source-line-no">034</span><span id="line-34"> */</span> |
| <span class="source-line-no">035</span><span id="line-35">@InterfaceAudience.Private</span> |
| <span class="source-line-no">036</span><span id="line-36">public class ClusterStatusTracker extends ZKNodeTracker {</span> |
| <span class="source-line-no">037</span><span id="line-37"> private static final Logger LOG = LoggerFactory.getLogger(ClusterStatusTracker.class);</span> |
| <span class="source-line-no">038</span><span id="line-38"></span> |
| <span class="source-line-no">039</span><span id="line-39"> /**</span> |
| <span class="source-line-no">040</span><span id="line-40"> * Creates a cluster status tracker.</span> |
| <span class="source-line-no">041</span><span id="line-41"> * <p></span> |
| <span class="source-line-no">042</span><span id="line-42"> * After construction, use {@link #start} to kick off tracking.</span> |
| <span class="source-line-no">043</span><span id="line-43"> * @param watcher reference to the {@link ZKWatcher} which also contains configuration and</span> |
| <span class="source-line-no">044</span><span id="line-44"> * constants</span> |
| <span class="source-line-no">045</span><span id="line-45"> * @param abortable used to abort if a fatal error occurs</span> |
| <span class="source-line-no">046</span><span id="line-46"> */</span> |
| <span class="source-line-no">047</span><span id="line-47"> public ClusterStatusTracker(ZKWatcher watcher, Abortable abortable) {</span> |
| <span class="source-line-no">048</span><span id="line-48"> super(watcher, watcher.getZNodePaths().clusterStateZNode, abortable);</span> |
| <span class="source-line-no">049</span><span id="line-49"> }</span> |
| <span class="source-line-no">050</span><span id="line-50"></span> |
| <span class="source-line-no">051</span><span id="line-51"> /**</span> |
| <span class="source-line-no">052</span><span id="line-52"> * Checks if cluster is up.</span> |
| <span class="source-line-no">053</span><span id="line-53"> * @return true if the cluster up ('shutdown' is its name up in zk) znode exists with data, false</span> |
| <span class="source-line-no">054</span><span id="line-54"> * if not</span> |
| <span class="source-line-no">055</span><span id="line-55"> */</span> |
| <span class="source-line-no">056</span><span id="line-56"> public boolean isClusterUp() {</span> |
| <span class="source-line-no">057</span><span id="line-57"> return super.getData(false) != null;</span> |
| <span class="source-line-no">058</span><span id="line-58"> }</span> |
| <span class="source-line-no">059</span><span id="line-59"></span> |
| <span class="source-line-no">060</span><span id="line-60"> /**</span> |
| <span class="source-line-no">061</span><span id="line-61"> * Sets the cluster as up.</span> |
| <span class="source-line-no">062</span><span id="line-62"> * @throws KeeperException unexpected zk exception</span> |
| <span class="source-line-no">063</span><span id="line-63"> */</span> |
| <span class="source-line-no">064</span><span id="line-64"> public void setClusterUp() throws KeeperException {</span> |
| <span class="source-line-no">065</span><span id="line-65"> byte[] upData = toByteArray();</span> |
| <span class="source-line-no">066</span><span id="line-66"> try {</span> |
| <span class="source-line-no">067</span><span id="line-67"> ZKUtil.createAndWatch(watcher, watcher.getZNodePaths().clusterStateZNode, upData);</span> |
| <span class="source-line-no">068</span><span id="line-68"> } catch (KeeperException.NodeExistsException nee) {</span> |
| <span class="source-line-no">069</span><span id="line-69"> ZKUtil.setData(watcher, watcher.getZNodePaths().clusterStateZNode, upData);</span> |
| <span class="source-line-no">070</span><span id="line-70"> }</span> |
| <span class="source-line-no">071</span><span id="line-71"> }</span> |
| <span class="source-line-no">072</span><span id="line-72"></span> |
| <span class="source-line-no">073</span><span id="line-73"> /**</span> |
| <span class="source-line-no">074</span><span id="line-74"> * Sets the cluster as down by deleting the znode.</span> |
| <span class="source-line-no">075</span><span id="line-75"> * @throws KeeperException unexpected zk exception</span> |
| <span class="source-line-no">076</span><span id="line-76"> */</span> |
| <span class="source-line-no">077</span><span id="line-77"> public void setClusterDown() throws KeeperException {</span> |
| <span class="source-line-no">078</span><span id="line-78"> try {</span> |
| <span class="source-line-no">079</span><span id="line-79"> ZKUtil.deleteNode(watcher, watcher.getZNodePaths().clusterStateZNode);</span> |
| <span class="source-line-no">080</span><span id="line-80"> } catch (KeeperException.NoNodeException nne) {</span> |
| <span class="source-line-no">081</span><span id="line-81"> LOG.warn("Attempted to set cluster as down but already down, cluster " + "state node ("</span> |
| <span class="source-line-no">082</span><span id="line-82"> + watcher.getZNodePaths().clusterStateZNode + ") not found");</span> |
| <span class="source-line-no">083</span><span id="line-83"> }</span> |
| <span class="source-line-no">084</span><span id="line-84"> }</span> |
| <span class="source-line-no">085</span><span id="line-85"></span> |
| <span class="source-line-no">086</span><span id="line-86"> /** Returns Content of the clusterup znode as a serialized pb with the pb magic as prefix. */</span> |
| <span class="source-line-no">087</span><span id="line-87"> static byte[] toByteArray() {</span> |
| <span class="source-line-no">088</span><span id="line-88"> ZooKeeperProtos.ClusterUp.Builder builder = ZooKeeperProtos.ClusterUp.newBuilder();</span> |
| <span class="source-line-no">089</span><span id="line-89"> builder.setStartDate(new java.util.Date().toString());</span> |
| <span class="source-line-no">090</span><span id="line-90"> return ProtobufUtil.prependPBMagic(builder.build().toByteArray());</span> |
| <span class="source-line-no">091</span><span id="line-91"> }</span> |
| <span class="source-line-no">092</span><span id="line-92">}</span> |
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