http://git-wip-us.apache.org/repos/asf/hbase-site/blob/809180c4/devapidocs/src-html/org/apache/hadoop/hbase/ZKNamespaceManager.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/ZKNamespaceManager.html b/devapidocs/src-html/org/apache/hadoop/hbase/ZKNamespaceManager.html index 31ad236..a24e89c 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/ZKNamespaceManager.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/ZKNamespaceManager.html @@ -34,188 +34,189 @@ <span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.HBaseProtos;<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.ZooKeeperListener;<a name="line.29"></a> -<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;<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><a name="line.32"></a> -<span class="sourceLineNo">033</span>import java.io.IOException;<a name="line.33"></a> -<span class="sourceLineNo">034</span>import java.util.List;<a name="line.34"></a> -<span class="sourceLineNo">035</span>import java.util.NavigableMap;<a name="line.35"></a> -<span class="sourceLineNo">036</span>import java.util.NavigableSet;<a name="line.36"></a> -<span class="sourceLineNo">037</span>import java.util.concurrent.ConcurrentSkipListMap;<a name="line.37"></a> -<span class="sourceLineNo">038</span><a name="line.38"></a> +<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.zookeeper.ZNodePaths;<a name="line.29"></a> +<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.zookeeper.ZooKeeperListener;<a name="line.30"></a> +<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;<a name="line.31"></a> +<span class="sourceLineNo">032</span>import org.apache.zookeeper.KeeperException;<a name="line.32"></a> +<span class="sourceLineNo">033</span><a name="line.33"></a> +<span class="sourceLineNo">034</span>import java.io.IOException;<a name="line.34"></a> +<span class="sourceLineNo">035</span>import java.util.List;<a name="line.35"></a> +<span class="sourceLineNo">036</span>import java.util.NavigableMap;<a name="line.36"></a> +<span class="sourceLineNo">037</span>import java.util.NavigableSet;<a name="line.37"></a> +<span class="sourceLineNo">038</span>import java.util.concurrent.ConcurrentSkipListMap;<a name="line.38"></a> <span class="sourceLineNo">039</span><a name="line.39"></a> -<span class="sourceLineNo">040</span>/**<a name="line.40"></a> -<span class="sourceLineNo">041</span> * Class servers two purposes:<a name="line.41"></a> -<span class="sourceLineNo">042</span> *<a name="line.42"></a> -<span class="sourceLineNo">043</span> * 1. Broadcast NamespaceDescriptor information via ZK<a name="line.43"></a> -<span class="sourceLineNo">044</span> * (Done by the Master)<a name="line.44"></a> -<span class="sourceLineNo">045</span> * 2. Consume broadcasted NamespaceDescriptor changes<a name="line.45"></a> -<span class="sourceLineNo">046</span> * (Done by the RegionServers)<a name="line.46"></a> -<span class="sourceLineNo">047</span> *<a name="line.47"></a> -<span class="sourceLineNo">048</span> */<a name="line.48"></a> -<span class="sourceLineNo">049</span>@InterfaceAudience.Private<a name="line.49"></a> -<span class="sourceLineNo">050</span>public class ZKNamespaceManager extends ZooKeeperListener {<a name="line.50"></a> -<span class="sourceLineNo">051</span> private static final Log LOG = LogFactory.getLog(ZKNamespaceManager.class);<a name="line.51"></a> -<span class="sourceLineNo">052</span> private final String nsZNode;<a name="line.52"></a> -<span class="sourceLineNo">053</span> private volatile NavigableMap<String,NamespaceDescriptor> cache;<a name="line.53"></a> -<span class="sourceLineNo">054</span><a name="line.54"></a> -<span class="sourceLineNo">055</span> public ZKNamespaceManager(ZooKeeperWatcher zkw) throws IOException {<a name="line.55"></a> -<span class="sourceLineNo">056</span> super(zkw);<a name="line.56"></a> -<span class="sourceLineNo">057</span> nsZNode = zkw.znodePaths.namespaceZNode;<a name="line.57"></a> -<span class="sourceLineNo">058</span> cache = new ConcurrentSkipListMap<>();<a name="line.58"></a> -<span class="sourceLineNo">059</span> }<a name="line.59"></a> -<span class="sourceLineNo">060</span><a name="line.60"></a> -<span class="sourceLineNo">061</span> public void start() throws IOException {<a name="line.61"></a> -<span class="sourceLineNo">062</span> watcher.registerListener(this);<a name="line.62"></a> -<span class="sourceLineNo">063</span> try {<a name="line.63"></a> -<span class="sourceLineNo">064</span> if (ZKUtil.watchAndCheckExists(watcher, nsZNode)) {<a name="line.64"></a> -<span class="sourceLineNo">065</span> List<ZKUtil.NodeAndData> existing =<a name="line.65"></a> -<span class="sourceLineNo">066</span> ZKUtil.getChildDataAndWatchForNewChildren(watcher, nsZNode);<a name="line.66"></a> -<span class="sourceLineNo">067</span> if (existing != null) {<a name="line.67"></a> -<span class="sourceLineNo">068</span> refreshNodes(existing);<a name="line.68"></a> -<span class="sourceLineNo">069</span> }<a name="line.69"></a> -<span class="sourceLineNo">070</span> } else {<a name="line.70"></a> -<span class="sourceLineNo">071</span> ZKUtil.createWithParents(watcher, nsZNode);<a name="line.71"></a> -<span class="sourceLineNo">072</span> }<a name="line.72"></a> -<span class="sourceLineNo">073</span> } catch (KeeperException e) {<a name="line.73"></a> -<span class="sourceLineNo">074</span> throw new IOException("Failed to initialize ZKNamespaceManager", e);<a name="line.74"></a> -<span class="sourceLineNo">075</span> }<a name="line.75"></a> -<span class="sourceLineNo">076</span> }<a name="line.76"></a> -<span class="sourceLineNo">077</span><a name="line.77"></a> -<span class="sourceLineNo">078</span> public NamespaceDescriptor get(String name) {<a name="line.78"></a> -<span class="sourceLineNo">079</span> return cache.get(name);<a name="line.79"></a> -<span class="sourceLineNo">080</span> }<a name="line.80"></a> -<span class="sourceLineNo">081</span><a name="line.81"></a> -<span class="sourceLineNo">082</span> public void update(NamespaceDescriptor ns) throws IOException {<a name="line.82"></a> -<span class="sourceLineNo">083</span> writeNamespace(ns);<a name="line.83"></a> -<span class="sourceLineNo">084</span> cache.put(ns.getName(), ns);<a name="line.84"></a> -<span class="sourceLineNo">085</span> }<a name="line.85"></a> -<span class="sourceLineNo">086</span><a name="line.86"></a> -<span class="sourceLineNo">087</span> public void remove(String name) throws IOException {<a name="line.87"></a> -<span class="sourceLineNo">088</span> deleteNamespace(name);<a name="line.88"></a> -<span class="sourceLineNo">089</span> cache.remove(name);<a name="line.89"></a> -<span class="sourceLineNo">090</span> }<a name="line.90"></a> -<span class="sourceLineNo">091</span><a name="line.91"></a> -<span class="sourceLineNo">092</span> public NavigableSet<NamespaceDescriptor> list() throws IOException {<a name="line.92"></a> -<span class="sourceLineNo">093</span> NavigableSet<NamespaceDescriptor> ret =<a name="line.93"></a> -<span class="sourceLineNo">094</span> Sets.newTreeSet(NamespaceDescriptor.NAMESPACE_DESCRIPTOR_COMPARATOR);<a name="line.94"></a> -<span class="sourceLineNo">095</span> for(NamespaceDescriptor ns: cache.values()) {<a name="line.95"></a> -<span class="sourceLineNo">096</span> ret.add(ns);<a name="line.96"></a> -<span class="sourceLineNo">097</span> }<a name="line.97"></a> -<span class="sourceLineNo">098</span> return ret;<a name="line.98"></a> -<span class="sourceLineNo">099</span> }<a name="line.99"></a> -<span class="sourceLineNo">100</span><a name="line.100"></a> -<span class="sourceLineNo">101</span> @Override<a name="line.101"></a> -<span class="sourceLineNo">102</span> public void nodeCreated(String path) {<a name="line.102"></a> -<span class="sourceLineNo">103</span> if (nsZNode.equals(path)) {<a name="line.103"></a> -<span class="sourceLineNo">104</span> try {<a name="line.104"></a> -<span class="sourceLineNo">105</span> List<ZKUtil.NodeAndData> nodes =<a name="line.105"></a> -<span class="sourceLineNo">106</span> ZKUtil.getChildDataAndWatchForNewChildren(watcher, nsZNode);<a name="line.106"></a> -<span class="sourceLineNo">107</span> refreshNodes(nodes);<a name="line.107"></a> -<span class="sourceLineNo">108</span> } catch (KeeperException ke) {<a name="line.108"></a> -<span class="sourceLineNo">109</span> String msg = "Error reading data from zookeeper";<a name="line.109"></a> -<span class="sourceLineNo">110</span> LOG.error(msg, ke);<a name="line.110"></a> -<span class="sourceLineNo">111</span> watcher.abort(msg, ke);<a name="line.111"></a> -<span class="sourceLineNo">112</span> } catch (IOException e) {<a name="line.112"></a> -<span class="sourceLineNo">113</span> String msg = "Error parsing data from zookeeper";<a name="line.113"></a> -<span class="sourceLineNo">114</span> LOG.error(msg, e);<a name="line.114"></a> -<span class="sourceLineNo">115</span> watcher.abort(msg, e);<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><a name="line.119"></a> -<span class="sourceLineNo">120</span> @Override<a name="line.120"></a> -<span class="sourceLineNo">121</span> public void nodeDeleted(String path) {<a name="line.121"></a> -<span class="sourceLineNo">122</span> if (nsZNode.equals(ZKUtil.getParent(path))) {<a name="line.122"></a> -<span class="sourceLineNo">123</span> String nsName = ZKUtil.getNodeName(path);<a name="line.123"></a> -<span class="sourceLineNo">124</span> cache.remove(nsName);<a name="line.124"></a> -<span class="sourceLineNo">125</span> }<a name="line.125"></a> -<span class="sourceLineNo">126</span> }<a name="line.126"></a> -<span class="sourceLineNo">127</span><a name="line.127"></a> -<span class="sourceLineNo">128</span> @Override<a name="line.128"></a> -<span class="sourceLineNo">129</span> public void nodeDataChanged(String path) {<a name="line.129"></a> -<span class="sourceLineNo">130</span> if (nsZNode.equals(ZKUtil.getParent(path))) {<a name="line.130"></a> -<span class="sourceLineNo">131</span> try {<a name="line.131"></a> -<span class="sourceLineNo">132</span> byte[] data = ZKUtil.getDataAndWatch(watcher, path);<a name="line.132"></a> -<span class="sourceLineNo">133</span> NamespaceDescriptor ns =<a name="line.133"></a> -<span class="sourceLineNo">134</span> ProtobufUtil.toNamespaceDescriptor(<a name="line.134"></a> -<span class="sourceLineNo">135</span> HBaseProtos.NamespaceDescriptor.parseFrom(data));<a name="line.135"></a> -<span class="sourceLineNo">136</span> cache.put(ns.getName(), ns);<a name="line.136"></a> -<span class="sourceLineNo">137</span> } catch (KeeperException ke) {<a name="line.137"></a> -<span class="sourceLineNo">138</span> String msg = "Error reading data from zookeeper for node "+path;<a name="line.138"></a> -<span class="sourceLineNo">139</span> LOG.error(msg, ke);<a name="line.139"></a> -<span class="sourceLineNo">140</span> // only option is to abort<a name="line.140"></a> -<span class="sourceLineNo">141</span> watcher.abort(msg, ke);<a name="line.141"></a> -<span class="sourceLineNo">142</span> } catch (IOException ioe) {<a name="line.142"></a> -<span class="sourceLineNo">143</span> String msg = "Error deserializing namespace: "+path;<a name="line.143"></a> -<span class="sourceLineNo">144</span> LOG.error(msg, ioe);<a name="line.144"></a> -<span class="sourceLineNo">145</span> watcher.abort(msg, ioe);<a name="line.145"></a> -<span class="sourceLineNo">146</span> }<a name="line.146"></a> 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zookeeper for path "+path, ke);<a name="line.158"></a> -<span class="sourceLineNo">159</span> watcher.abort("ZooKeeper error get node children for path "+path, ke);<a name="line.159"></a> -<span class="sourceLineNo">160</span> } catch (IOException e) {<a name="line.160"></a> -<span class="sourceLineNo">161</span> LOG.error("Error deserializing namespace child from: "+path, e);<a name="line.161"></a> -<span class="sourceLineNo">162</span> watcher.abort("Error deserializing namespace child from: " + path, e);<a name="line.162"></a> -<span class="sourceLineNo">163</span> }<a name="line.163"></a> -<span class="sourceLineNo">164</span> }<a name="line.164"></a> -<span class="sourceLineNo">165</span> }<a name="line.165"></a> -<span class="sourceLineNo">166</span><a name="line.166"></a> -<span class="sourceLineNo">167</span> private void deleteNamespace(String name) throws IOException {<a name="line.167"></a> -<span class="sourceLineNo">168</span> String zNode = ZKUtil.joinZNode(nsZNode, name);<a name="line.168"></a> -<span class="sourceLineNo">169</span> try {<a name="line.169"></a> -<span class="sourceLineNo">170</span> ZKUtil.deleteNode(watcher, zNode);<a name="line.170"></a> -<span class="sourceLineNo">171</span> } catch (KeeperException e) {<a name="line.171"></a> -<span class="sourceLineNo">172</span> if (e instanceof KeeperException.NoNodeException) {<a name="line.172"></a> -<span class="sourceLineNo">173</span> // If the node does not exist, it could be already deleted. Continue without fail.<a name="line.173"></a> -<span class="sourceLineNo">174</span> LOG.warn("The ZNode " + zNode + " for namespace " + name + " does not exist.");<a name="line.174"></a> -<span class="sourceLineNo">175</span> } else {<a name="line.175"></a> -<span class="sourceLineNo">176</span> LOG.error("Failed updating permissions for namespace " + name, e);<a name="line.176"></a> -<span class="sourceLineNo">177</span> throw new IOException("Failed updating permissions for namespace " + name, e);<a name="line.177"></a> -<span class="sourceLineNo">178</span> }<a name="line.178"></a> -<span class="sourceLineNo">179</span> }<a name="line.179"></a> -<span class="sourceLineNo">180</span> }<a name="line.180"></a> -<span class="sourceLineNo">181</span><a name="line.181"></a> -<span class="sourceLineNo">182</span> private void writeNamespace(NamespaceDescriptor ns) throws IOException {<a name="line.182"></a> -<span class="sourceLineNo">183</span> String zNode = ZKUtil.joinZNode(nsZNode, ns.getName());<a name="line.183"></a> -<span class="sourceLineNo">184</span> try {<a name="line.184"></a> -<span class="sourceLineNo">185</span> ZKUtil.createWithParents(watcher, zNode);<a name="line.185"></a> -<span class="sourceLineNo">186</span> ZKUtil.updateExistingNodeData(watcher, zNode,<a name="line.186"></a> -<span class="sourceLineNo">187</span> ProtobufUtil.toProtoNamespaceDescriptor(ns).toByteArray(), -1);<a name="line.187"></a> -<span class="sourceLineNo">188</span> } catch (KeeperException e) {<a name="line.188"></a> -<span class="sourceLineNo">189</span> LOG.error("Failed updating permissions for namespace "+ns.getName(), e);<a name="line.189"></a> -<span class="sourceLineNo">190</span> throw new IOException("Failed updating permissions for namespace "+ns.getName(), e);<a name="line.190"></a> -<span class="sourceLineNo">191</span> }<a name="line.191"></a> -<span class="sourceLineNo">192</span> }<a name="line.192"></a> -<span class="sourceLineNo">193</span><a name="line.193"></a> -<span class="sourceLineNo">194</span> private void refreshNodes(List<ZKUtil.NodeAndData> nodes) throws IOException {<a name="line.194"></a> -<span class="sourceLineNo">195</span> for (ZKUtil.NodeAndData n : nodes) {<a name="line.195"></a> -<span class="sourceLineNo">196</span> if (n.isEmpty()) continue;<a name="line.196"></a> -<span class="sourceLineNo">197</span> String path = n.getNode();<a name="line.197"></a> -<span class="sourceLineNo">198</span> String namespace = ZKUtil.getNodeName(path);<a name="line.198"></a> -<span class="sourceLineNo">199</span> byte[] nodeData = n.getData();<a name="line.199"></a> -<span class="sourceLineNo">200</span> if (LOG.isDebugEnabled()) {<a name="line.200"></a> -<span class="sourceLineNo">201</span> LOG.debug("Updating namespace cache from node "+namespace+" with data: "+<a name="line.201"></a> -<span class="sourceLineNo">202</span> Bytes.toStringBinary(nodeData));<a name="line.202"></a> -<span class="sourceLineNo">203</span> }<a name="line.203"></a> -<span class="sourceLineNo">204</span> NamespaceDescriptor ns =<a name="line.204"></a> -<span class="sourceLineNo">205</span> ProtobufUtil.toNamespaceDescriptor(<a name="line.205"></a> -<span class="sourceLineNo">206</span> HBaseProtos.NamespaceDescriptor.parseFrom(nodeData));<a name="line.206"></a> -<span class="sourceLineNo">207</span> cache.put(ns.getName(), ns);<a name="line.207"></a> -<span class="sourceLineNo">208</span> }<a name="line.208"></a> -<span class="sourceLineNo">209</span> }<a name="line.209"></a> -<span class="sourceLineNo">210</span>}<a name="line.210"></a> +<span class="sourceLineNo">040</span><a name="line.40"></a> +<span class="sourceLineNo">041</span>/**<a name="line.41"></a> +<span class="sourceLineNo">042</span> * Class servers two purposes:<a name="line.42"></a> +<span class="sourceLineNo">043</span> *<a name="line.43"></a> +<span class="sourceLineNo">044</span> * 1. 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throws IOException {<a name="line.56"></a> +<span class="sourceLineNo">057</span> super(zkw);<a name="line.57"></a> +<span class="sourceLineNo">058</span> nsZNode = zkw.znodePaths.namespaceZNode;<a name="line.58"></a> +<span class="sourceLineNo">059</span> cache = new ConcurrentSkipListMap<>();<a name="line.59"></a> +<span class="sourceLineNo">060</span> }<a name="line.60"></a> +<span class="sourceLineNo">061</span><a name="line.61"></a> +<span class="sourceLineNo">062</span> public void start() throws IOException {<a name="line.62"></a> +<span class="sourceLineNo">063</span> watcher.registerListener(this);<a name="line.63"></a> +<span class="sourceLineNo">064</span> try {<a name="line.64"></a> +<span class="sourceLineNo">065</span> if (ZKUtil.watchAndCheckExists(watcher, nsZNode)) {<a name="line.65"></a> +<span class="sourceLineNo">066</span> List<ZKUtil.NodeAndData> existing =<a name="line.66"></a> +<span class="sourceLineNo">067</span> 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public NamespaceDescriptor get(String name) {<a name="line.79"></a> +<span class="sourceLineNo">080</span> return cache.get(name);<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 update(NamespaceDescriptor ns) throws IOException {<a name="line.83"></a> +<span class="sourceLineNo">084</span> writeNamespace(ns);<a name="line.84"></a> +<span class="sourceLineNo">085</span> cache.put(ns.getName(), ns);<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> public void remove(String name) throws IOException {<a name="line.88"></a> +<span class="sourceLineNo">089</span> deleteNamespace(name);<a name="line.89"></a> +<span class="sourceLineNo">090</span> cache.remove(name);<a name="line.90"></a> +<span 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class="sourceLineNo">103</span> public void nodeCreated(String path) {<a name="line.103"></a> +<span class="sourceLineNo">104</span> if (nsZNode.equals(path)) {<a name="line.104"></a> +<span class="sourceLineNo">105</span> try {<a name="line.105"></a> +<span class="sourceLineNo">106</span> List<ZKUtil.NodeAndData> nodes =<a name="line.106"></a> +<span class="sourceLineNo">107</span> ZKUtil.getChildDataAndWatchForNewChildren(watcher, nsZNode);<a name="line.107"></a> +<span class="sourceLineNo">108</span> refreshNodes(nodes);<a name="line.108"></a> +<span class="sourceLineNo">109</span> } catch (KeeperException ke) {<a name="line.109"></a> +<span class="sourceLineNo">110</span> String msg = "Error reading data from zookeeper";<a name="line.110"></a> +<span class="sourceLineNo">111</span> LOG.error(msg, ke);<a name="line.111"></a> +<span class="sourceLineNo">112</span> watcher.abort(msg, ke);<a name="line.112"></a> +<span class="sourceLineNo">113</span> } catch (IOException e) {<a name="line.113"></a> +<span class="sourceLineNo">114</span> String msg = "Error parsing data from zookeeper";<a name="line.114"></a> +<span class="sourceLineNo">115</span> LOG.error(msg, e);<a name="line.115"></a> +<span class="sourceLineNo">116</span> watcher.abort(msg, e);<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> }<a name="line.119"></a> +<span class="sourceLineNo">120</span><a name="line.120"></a> +<span class="sourceLineNo">121</span> @Override<a name="line.121"></a> +<span class="sourceLineNo">122</span> public void nodeDeleted(String path) {<a name="line.122"></a> +<span class="sourceLineNo">123</span> if (nsZNode.equals(ZKUtil.getParent(path))) {<a name="line.123"></a> +<span class="sourceLineNo">124</span> String nsName = ZKUtil.getNodeName(path);<a name="line.124"></a> +<span class="sourceLineNo">125</span> cache.remove(nsName);<a name="line.125"></a> +<span class="sourceLineNo">126</span> }<a name="line.126"></a> +<span class="sourceLineNo">127</span> }<a name="line.127"></a> +<span class="sourceLineNo">128</span><a name="line.128"></a> +<span class="sourceLineNo">129</span> @Override<a name="line.129"></a> +<span class="sourceLineNo">130</span> public void nodeDataChanged(String path) {<a name="line.130"></a> +<span class="sourceLineNo">131</span> if (nsZNode.equals(ZKUtil.getParent(path))) {<a name="line.131"></a> +<span class="sourceLineNo">132</span> try {<a name="line.132"></a> +<span class="sourceLineNo">133</span> byte[] data = ZKUtil.getDataAndWatch(watcher, path);<a name="line.133"></a> +<span class="sourceLineNo">134</span> NamespaceDescriptor ns =<a name="line.134"></a> +<span class="sourceLineNo">135</span> ProtobufUtil.toNamespaceDescriptor(<a name="line.135"></a> +<span class="sourceLineNo">136</span> HBaseProtos.NamespaceDescriptor.parseFrom(data));<a name="line.136"></a> +<span class="sourceLineNo">137</span> cache.put(ns.getName(), ns);<a name="line.137"></a> +<span class="sourceLineNo">138</span> } catch (KeeperException ke) {<a name="line.138"></a> +<span class="sourceLineNo">139</span> String msg = "Error reading data from zookeeper for node "+path;<a name="line.139"></a> +<span class="sourceLineNo">140</span> LOG.error(msg, ke);<a name="line.140"></a> +<span class="sourceLineNo">141</span> // only option is to abort<a name="line.141"></a> +<span class="sourceLineNo">142</span> watcher.abort(msg, ke);<a name="line.142"></a> +<span class="sourceLineNo">143</span> } catch (IOException ioe) {<a name="line.143"></a> +<span class="sourceLineNo">144</span> String msg = "Error deserializing namespace: "+path;<a name="line.144"></a> +<span class="sourceLineNo">145</span> LOG.error(msg, ioe);<a name="line.145"></a> +<span class="sourceLineNo">146</span> watcher.abort(msg, ioe);<a name="line.146"></a> +<span class="sourceLineNo">147</span> }<a name="line.147"></a> +<span class="sourceLineNo">148</span> }<a name="line.148"></a> +<span class="sourceLineNo">149</span> }<a name="line.149"></a> +<span class="sourceLineNo">150</span><a name="line.150"></a> +<span class="sourceLineNo">151</span> @Override<a name="line.151"></a> +<span class="sourceLineNo">152</span> public void nodeChildrenChanged(String path) {<a name="line.152"></a> +<span class="sourceLineNo">153</span> if (nsZNode.equals(path)) {<a name="line.153"></a> +<span class="sourceLineNo">154</span> try {<a name="line.154"></a> +<span class="sourceLineNo">155</span> List<ZKUtil.NodeAndData> nodes =<a name="line.155"></a> +<span class="sourceLineNo">156</span> ZKUtil.getChildDataAndWatchForNewChildren(watcher, nsZNode);<a name="line.156"></a> +<span class="sourceLineNo">157</span> refreshNodes(nodes);<a name="line.157"></a> +<span class="sourceLineNo">158</span> } catch (KeeperException ke) {<a name="line.158"></a> +<span class="sourceLineNo">159</span> LOG.error("Error reading data from zookeeper for path "+path, ke);<a name="line.159"></a> +<span class="sourceLineNo">160</span> watcher.abort("ZooKeeper error get node children for path "+path, ke);<a name="line.160"></a> +<span class="sourceLineNo">161</span> } catch (IOException e) {<a name="line.161"></a> +<span class="sourceLineNo">162</span> LOG.error("Error deserializing namespace child from: "+path, e);<a name="line.162"></a> +<span class="sourceLineNo">163</span> watcher.abort("Error deserializing namespace child from: " + path, e);<a name="line.163"></a> +<span class="sourceLineNo">164</span> }<a name="line.164"></a> +<span class="sourceLineNo">165</span> }<a name="line.165"></a> +<span class="sourceLineNo">166</span> }<a name="line.166"></a> +<span class="sourceLineNo">167</span><a name="line.167"></a> +<span class="sourceLineNo">168</span> private void deleteNamespace(String name) throws IOException {<a name="line.168"></a> +<span class="sourceLineNo">169</span> String zNode = ZNodePaths.joinZNode(nsZNode, name);<a name="line.169"></a> +<span class="sourceLineNo">170</span> try {<a name="line.170"></a> +<span class="sourceLineNo">171</span> ZKUtil.deleteNode(watcher, zNode);<a name="line.171"></a> +<span class="sourceLineNo">172</span> } catch (KeeperException e) {<a name="line.172"></a> +<span class="sourceLineNo">173</span> if (e instanceof KeeperException.NoNodeException) {<a name="line.173"></a> +<span class="sourceLineNo">174</span> // If the node does not exist, it could be already deleted. Continue without fail.<a name="line.174"></a> +<span class="sourceLineNo">175</span> LOG.warn("The ZNode " + zNode + " for namespace " + name + " does not exist.");<a name="line.175"></a> +<span class="sourceLineNo">176</span> } else {<a name="line.176"></a> +<span class="sourceLineNo">177</span> LOG.error("Failed updating permissions for namespace " + name, e);<a name="line.177"></a> +<span class="sourceLineNo">178</span> throw new IOException("Failed updating permissions for namespace " + name, e);<a name="line.178"></a> +<span class="sourceLineNo">179</span> }<a name="line.179"></a> +<span class="sourceLineNo">180</span> }<a name="line.180"></a> +<span class="sourceLineNo">181</span> }<a name="line.181"></a> +<span class="sourceLineNo">182</span><a name="line.182"></a> +<span class="sourceLineNo">183</span> private void writeNamespace(NamespaceDescriptor ns) throws IOException {<a name="line.183"></a> +<span class="sourceLineNo">184</span> String zNode = ZNodePaths.joinZNode(nsZNode, ns.getName());<a name="line.184"></a> +<span class="sourceLineNo">185</span> try {<a name="line.185"></a> +<span class="sourceLineNo">186</span> ZKUtil.createWithParents(watcher, zNode);<a name="line.186"></a> +<span class="sourceLineNo">187</span> ZKUtil.updateExistingNodeData(watcher, zNode,<a name="line.187"></a> +<span class="sourceLineNo">188</span> ProtobufUtil.toProtoNamespaceDescriptor(ns).toByteArray(), -1);<a name="line.188"></a> +<span class="sourceLineNo">189</span> } catch (KeeperException e) {<a name="line.189"></a> +<span class="sourceLineNo">190</span> LOG.error("Failed updating permissions for namespace "+ns.getName(), e);<a name="line.190"></a> +<span class="sourceLineNo">191</span> throw new IOException("Failed updating permissions for namespace "+ns.getName(), e);<a name="line.191"></a> +<span class="sourceLineNo">192</span> }<a name="line.192"></a> +<span class="sourceLineNo">193</span> }<a name="line.193"></a> +<span class="sourceLineNo">194</span><a name="line.194"></a> +<span class="sourceLineNo">195</span> private void refreshNodes(List<ZKUtil.NodeAndData> nodes) throws IOException {<a name="line.195"></a> +<span class="sourceLineNo">196</span> for (ZKUtil.NodeAndData n : nodes) {<a name="line.196"></a> +<span class="sourceLineNo">197</span> if (n.isEmpty()) continue;<a name="line.197"></a> +<span class="sourceLineNo">198</span> String path = n.getNode();<a name="line.198"></a> +<span class="sourceLineNo">199</span> String namespace = ZKUtil.getNodeName(path);<a name="line.199"></a> +<span class="sourceLineNo">200</span> byte[] nodeData = n.getData();<a name="line.200"></a> +<span class="sourceLineNo">201</span> if (LOG.isDebugEnabled()) {<a name="line.201"></a> +<span class="sourceLineNo">202</span> LOG.debug("Updating namespace cache from node "+namespace+" with data: "+<a name="line.202"></a> +<span class="sourceLineNo">203</span> Bytes.toStringBinary(nodeData));<a name="line.203"></a> +<span class="sourceLineNo">204</span> }<a name="line.204"></a> +<span class="sourceLineNo">205</span> NamespaceDescriptor ns =<a name="line.205"></a> +<span class="sourceLineNo">206</span> ProtobufUtil.toNamespaceDescriptor(<a name="line.206"></a> +<span class="sourceLineNo">207</span> HBaseProtos.NamespaceDescriptor.parseFrom(nodeData));<a name="line.207"></a> +<span class="sourceLineNo">208</span> cache.put(ns.getName(), ns);<a name="line.208"></a> +<span class="sourceLineNo">209</span> }<a name="line.209"></a> +<span class="sourceLineNo">210</span> }<a name="line.210"></a> +<span class="sourceLineNo">211</span>}<a name="line.211"></a>
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/809180c4/devapidocs/src-html/org/apache/hadoop/hbase/ZNodeClearer.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/ZNodeClearer.html b/devapidocs/src-html/org/apache/hadoop/hbase/ZNodeClearer.html index 122c3f3..9e6e2b9 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/ZNodeClearer.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/ZNodeClearer.html @@ -40,178 +40,180 @@ <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer;<a name="line.32"></a> <span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.zookeeper.MasterAddressTracker;<a name="line.33"></a> <span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.zookeeper.ZKUtil;<a name="line.34"></a> -<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;<a name="line.35"></a> -<span class="sourceLineNo">036</span>import org.apache.zookeeper.KeeperException;<a name="line.36"></a> -<span class="sourceLineNo">037</span><a name="line.37"></a> -<span class="sourceLineNo">038</span>/**<a name="line.38"></a> -<span class="sourceLineNo">039</span> * <p>Contains a set of methods for the collaboration between the start/stop scripts and the<a name="line.39"></a> -<span class="sourceLineNo">040</span> * servers. It allows to delete immediately the znode when the master or the regions server crashes.<a name="line.40"></a> -<span class="sourceLineNo">041</span> * The region server / master writes a specific file when it starts / becomes main master. When they<a name="line.41"></a> -<span class="sourceLineNo">042</span> * end properly, they delete the file.</p><a name="line.42"></a> -<span class="sourceLineNo">043</span> * <p>In the script, we check for the existence of these files when the program ends. If they still<a name="line.43"></a> -<span class="sourceLineNo">044</span> * exist we conclude that the server crashed, likely without deleting their znode. To have a faster<a name="line.44"></a> -<span class="sourceLineNo">045</span> * recovery we delete immediately the znode.</p><a name="line.45"></a> -<span class="sourceLineNo">046</span> * <p>The strategy depends on the server type. For a region server we store the znode path in the<a name="line.46"></a> -<span class="sourceLineNo">047</span> * file, and use it to delete it. for a master, as the znode path constant whatever the server, we<a name="line.47"></a> -<span class="sourceLineNo">048</span> * check its content to make sure that the backup server is not now in charge.</p><a name="line.48"></a> -<span class="sourceLineNo">049</span> */<a name="line.49"></a> -<span class="sourceLineNo">050</span>public class ZNodeClearer {<a name="line.50"></a> -<span class="sourceLineNo">051</span> private static final Log LOG = LogFactory.getLog(ZNodeClearer.class);<a name="line.51"></a> -<span class="sourceLineNo">052</span><a name="line.52"></a> -<span class="sourceLineNo">053</span> private ZNodeClearer() {}<a name="line.53"></a> -<span class="sourceLineNo">054</span><a name="line.54"></a> -<span class="sourceLineNo">055</span> /**<a name="line.55"></a> -<span class="sourceLineNo">056</span> * Logs the errors without failing on exception.<a name="line.56"></a> -<span class="sourceLineNo">057</span> */<a name="line.57"></a> -<span class="sourceLineNo">058</span> public static void writeMyEphemeralNodeOnDisk(String fileContent) {<a name="line.58"></a> -<span class="sourceLineNo">059</span> String fileName = ZNodeClearer.getMyEphemeralNodeFileName();<a name="line.59"></a> -<span class="sourceLineNo">060</span> if (fileName == null) {<a name="line.60"></a> -<span class="sourceLineNo">061</span> LOG.warn("Environment variable HBASE_ZNODE_FILE not set; znodes will not be cleared " +<a name="line.61"></a> -<span class="sourceLineNo">062</span> "on crash by start scripts (Longer MTTR!)");<a name="line.62"></a> -<span class="sourceLineNo">063</span> return;<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> FileWriter fstream;<a name="line.66"></a> -<span class="sourceLineNo">067</span> try {<a name="line.67"></a> -<span class="sourceLineNo">068</span> fstream = new FileWriter(fileName);<a name="line.68"></a> -<span class="sourceLineNo">069</span> } catch (IOException e) {<a name="line.69"></a> -<span class="sourceLineNo">070</span> LOG.warn("Can't write znode file "+fileName, e);<a name="line.70"></a> -<span class="sourceLineNo">071</span> return;<a name="line.71"></a> -<span class="sourceLineNo">072</span> }<a name="line.72"></a> -<span class="sourceLineNo">073</span><a name="line.73"></a> -<span class="sourceLineNo">074</span> BufferedWriter out = new BufferedWriter(fstream);<a name="line.74"></a> -<span class="sourceLineNo">075</span><a name="line.75"></a> -<span class="sourceLineNo">076</span> try {<a name="line.76"></a> -<span class="sourceLineNo">077</span> try {<a name="line.77"></a> -<span class="sourceLineNo">078</span> out.write(fileContent + "\n");<a name="line.78"></a> -<span class="sourceLineNo">079</span> } finally {<a name="line.79"></a> -<span class="sourceLineNo">080</span> try {<a name="line.80"></a> -<span class="sourceLineNo">081</span> out.close();<a name="line.81"></a> -<span class="sourceLineNo">082</span> } finally {<a name="line.82"></a> -<span class="sourceLineNo">083</span> fstream.close();<a name="line.83"></a> -<span class="sourceLineNo">084</span> }<a name="line.84"></a> -<span class="sourceLineNo">085</span> }<a name="line.85"></a> -<span class="sourceLineNo">086</span> } catch (IOException e) {<a name="line.86"></a> -<span class="sourceLineNo">087</span> LOG.warn("Can't write znode file "+fileName, e);<a name="line.87"></a> -<span class="sourceLineNo">088</span> }<a name="line.88"></a> -<span class="sourceLineNo">089</span> }<a name="line.89"></a> -<span class="sourceLineNo">090</span><a name="line.90"></a> -<span class="sourceLineNo">091</span> /**<a name="line.91"></a> -<span class="sourceLineNo">092</span> * read the content of znode file, expects a single line.<a name="line.92"></a> -<span class="sourceLineNo">093</span> */<a name="line.93"></a> -<span class="sourceLineNo">094</span> public static String readMyEphemeralNodeOnDisk() throws IOException {<a name="line.94"></a> -<span class="sourceLineNo">095</span> String fileName = getMyEphemeralNodeFileName();<a name="line.95"></a> -<span class="sourceLineNo">096</span> if (fileName == null){<a name="line.96"></a> -<span class="sourceLineNo">097</span> throw new FileNotFoundException("No filename; set environment variable HBASE_ZNODE_FILE");<a name="line.97"></a> -<span class="sourceLineNo">098</span> }<a name="line.98"></a> -<span class="sourceLineNo">099</span> FileReader znodeFile = new FileReader(fileName);<a name="line.99"></a> -<span class="sourceLineNo">100</span> BufferedReader br = null;<a name="line.100"></a> -<span class="sourceLineNo">101</span> try {<a name="line.101"></a> -<span class="sourceLineNo">102</span> br = new BufferedReader(znodeFile);<a name="line.102"></a> -<span class="sourceLineNo">103</span> String file_content = br.readLine();<a name="line.103"></a> -<span class="sourceLineNo">104</span> return file_content;<a name="line.104"></a> -<span class="sourceLineNo">105</span> } finally {<a name="line.105"></a> -<span class="sourceLineNo">106</span> if (br != null) br.close();<a name="line.106"></a> -<span class="sourceLineNo">107</span> }<a name="line.107"></a> -<span class="sourceLineNo">108</span> }<a name="line.108"></a> -<span class="sourceLineNo">109</span><a name="line.109"></a> -<span class="sourceLineNo">110</span> /**<a name="line.110"></a> -<span class="sourceLineNo">111</span> * Get the name of the file used to store the znode contents<a name="line.111"></a> -<span class="sourceLineNo">112</span> */<a name="line.112"></a> -<span class="sourceLineNo">113</span> public static String getMyEphemeralNodeFileName() {<a name="line.113"></a> -<span class="sourceLineNo">114</span> return System.getenv().get("HBASE_ZNODE_FILE");<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> * delete the znode file<a name="line.118"></a> -<span class="sourceLineNo">119</span> */<a name="line.119"></a> -<span class="sourceLineNo">120</span> public static void deleteMyEphemeralNodeOnDisk() {<a name="line.120"></a> -<span class="sourceLineNo">121</span> String fileName = getMyEphemeralNodeFileName();<a name="line.121"></a> -<span class="sourceLineNo">122</span><a name="line.122"></a> -<span class="sourceLineNo">123</span> if (fileName != null) {<a name="line.123"></a> -<span class="sourceLineNo">124</span> new File(fileName).delete();<a name="line.124"></a> -<span class="sourceLineNo">125</span> }<a name="line.125"></a> -<span class="sourceLineNo">126</span> }<a name="line.126"></a> -<span class="sourceLineNo">127</span><a name="line.127"></a> -<span class="sourceLineNo">128</span> /**<a name="line.128"></a> -<span class="sourceLineNo">129</span> * See HBASE-14861. We are extracting master ServerName from rsZnodePath<a name="line.129"></a> -<span class="sourceLineNo">130</span> * example: "/hbase/rs/server.example.com,16020,1448266496481"<a name="line.130"></a> -<span class="sourceLineNo">131</span> * @param rsZnodePath from HBASE_ZNODE_FILE<a name="line.131"></a> -<span class="sourceLineNo">132</span> * @return String representation of ServerName or null if fails<a name="line.132"></a> -<span class="sourceLineNo">133</span> */<a name="line.133"></a> -<span class="sourceLineNo">134</span> <a name="line.134"></a> -<span class="sourceLineNo">135</span> public static String parseMasterServerName(String rsZnodePath) {<a name="line.135"></a> -<span class="sourceLineNo">136</span> String masterServerName = null;<a name="line.136"></a> -<span class="sourceLineNo">137</span> try {<a name="line.137"></a> -<span class="sourceLineNo">138</span> String[] rsZnodeParts = rsZnodePath.split("/");<a name="line.138"></a> -<span class="sourceLineNo">139</span> masterServerName = rsZnodeParts[rsZnodeParts.length -1];<a name="line.139"></a> -<span class="sourceLineNo">140</span> } catch (IndexOutOfBoundsException e) {<a name="line.140"></a> -<span class="sourceLineNo">141</span> LOG.warn("String " + rsZnodePath + " has wrong format", e);<a name="line.141"></a> -<span class="sourceLineNo">142</span> }<a name="line.142"></a> -<span class="sourceLineNo">143</span> return masterServerName; <a name="line.143"></a> -<span class="sourceLineNo">144</span> }<a name="line.144"></a> -<span class="sourceLineNo">145</span> <a name="line.145"></a> -<span class="sourceLineNo">146</span> /**<a name="line.146"></a> -<span class="sourceLineNo">147</span> * <a name="line.147"></a> -<span class="sourceLineNo">148</span> * @return true if cluster is configured with master-rs collocation <a name="line.148"></a> -<span class="sourceLineNo">149</span> */<a name="line.149"></a> -<span class="sourceLineNo">150</span> private static boolean tablesOnMaster(Configuration conf) {<a name="line.150"></a> -<span class="sourceLineNo">151</span> boolean tablesOnMaster = true;<a name="line.151"></a> -<span class="sourceLineNo">152</span> String confValue = conf.get(BaseLoadBalancer.TABLES_ON_MASTER);<a name="line.152"></a> -<span class="sourceLineNo">153</span> if (confValue != null && confValue.equalsIgnoreCase("none")) {<a name="line.153"></a> -<span class="sourceLineNo">154</span> tablesOnMaster = false;<a name="line.154"></a> -<span class="sourceLineNo">155</span> }<a name="line.155"></a> -<span class="sourceLineNo">156</span> return tablesOnMaster;<a name="line.156"></a> -<span class="sourceLineNo">157</span> }<a name="line.157"></a> -<span class="sourceLineNo">158</span><a name="line.158"></a> -<span class="sourceLineNo">159</span> /**<a name="line.159"></a> -<span class="sourceLineNo">160</span> * Delete the master znode if its content (ServerName string) is the same<a name="line.160"></a> -<span class="sourceLineNo">161</span> * as the one in the znode file. (env: HBASE_ZNODE_FILE). I case of master-rs<a name="line.161"></a> -<span class="sourceLineNo">162</span> * colloaction we extract ServerName string from rsZnode path.(HBASE-14861)<a name="line.162"></a> -<span class="sourceLineNo">163</span> * @return true on successful deletion, false otherwise.<a name="line.163"></a> -<span class="sourceLineNo">164</span> */<a name="line.164"></a> -<span class="sourceLineNo">165</span> public static boolean clear(Configuration conf) {<a name="line.165"></a> -<span class="sourceLineNo">166</span> Configuration tempConf = new Configuration(conf);<a name="line.166"></a> -<span class="sourceLineNo">167</span> tempConf.setInt("zookeeper.recovery.retry", 0);<a name="line.167"></a> -<span class="sourceLineNo">168</span><a name="line.168"></a> -<span class="sourceLineNo">169</span> ZooKeeperWatcher zkw;<a name="line.169"></a> -<span class="sourceLineNo">170</span> try {<a name="line.170"></a> -<span class="sourceLineNo">171</span> zkw = new ZooKeeperWatcher(tempConf, "clean znode for master",<a name="line.171"></a> -<span class="sourceLineNo">172</span> new Abortable() {<a name="line.172"></a> -<span class="sourceLineNo">173</span> @Override public void abort(String why, Throwable e) {}<a name="line.173"></a> -<span class="sourceLineNo">174</span> @Override public boolean isAborted() { return false; }<a name="line.174"></a> -<span class="sourceLineNo">175</span> });<a name="line.175"></a> -<span class="sourceLineNo">176</span> } catch (IOException e) {<a name="line.176"></a> -<span class="sourceLineNo">177</span> LOG.warn("Can't connect to zookeeper to read the master znode", e);<a name="line.177"></a> -<span class="sourceLineNo">178</span> return false;<a name="line.178"></a> -<span class="sourceLineNo">179</span> }<a name="line.179"></a> -<span class="sourceLineNo">180</span><a name="line.180"></a> -<span class="sourceLineNo">181</span> String znodeFileContent;<a name="line.181"></a> -<span class="sourceLineNo">182</span> try {<a name="line.182"></a> -<span class="sourceLineNo">183</span> znodeFileContent = ZNodeClearer.readMyEphemeralNodeOnDisk();<a name="line.183"></a> -<span class="sourceLineNo">184</span> if(ZNodeClearer.tablesOnMaster(conf)) {<a name="line.184"></a> -<span class="sourceLineNo">185</span> //In case of master crash also remove rsZnode since master is also regionserver <a name="line.185"></a> -<span class="sourceLineNo">186</span> ZKUtil.deleteNodeFailSilent(zkw, ZKUtil.joinZNode(zkw.znodePaths.rsZNode,znodeFileContent));<a name="line.186"></a> -<span class="sourceLineNo">187</span> return MasterAddressTracker.deleteIfEquals(zkw, <a name="line.187"></a> -<span class="sourceLineNo">188</span> ZNodeClearer.parseMasterServerName(znodeFileContent));<a name="line.188"></a> -<span class="sourceLineNo">189</span> } else {<a name="line.189"></a> -<span class="sourceLineNo">190</span> return MasterAddressTracker.deleteIfEquals(zkw, znodeFileContent);<a name="line.190"></a> -<span class="sourceLineNo">191</span> }<a name="line.191"></a> -<span class="sourceLineNo">192</span> } catch (FileNotFoundException fnfe) {<a name="line.192"></a> -<span class="sourceLineNo">193</span> // If no file, just keep going -- return success.<a name="line.193"></a> -<span class="sourceLineNo">194</span> LOG.warn("Can't find the znode file; presume non-fatal", fnfe);<a name="line.194"></a> -<span class="sourceLineNo">195</span> return true;<a name="line.195"></a> -<span class="sourceLineNo">196</span> } catch (IOException e) {<a name="line.196"></a> -<span class="sourceLineNo">197</span> LOG.warn("Can't read the content of the znode file", e);<a name="line.197"></a> -<span class="sourceLineNo">198</span> return false;<a name="line.198"></a> -<span class="sourceLineNo">199</span> } catch (KeeperException e) {<a name="line.199"></a> -<span class="sourceLineNo">200</span> LOG.warn("ZooKeeper exception deleting znode", e);<a name="line.200"></a> -<span class="sourceLineNo">201</span> return false;<a name="line.201"></a> -<span class="sourceLineNo">202</span> } finally {<a name="line.202"></a> -<span class="sourceLineNo">203</span> zkw.close();<a name="line.203"></a> -<span class="sourceLineNo">204</span> }<a name="line.204"></a> -<span class="sourceLineNo">205</span> }<a name="line.205"></a> -<span class="sourceLineNo">206</span>}<a name="line.206"></a> +<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.zookeeper.ZNodePaths;<a name="line.35"></a> +<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;<a name="line.36"></a> +<span class="sourceLineNo">037</span>import org.apache.zookeeper.KeeperException;<a name="line.37"></a> +<span class="sourceLineNo">038</span><a name="line.38"></a> +<span class="sourceLineNo">039</span>/**<a name="line.39"></a> +<span class="sourceLineNo">040</span> * <p>Contains a set of methods for the collaboration between the start/stop scripts and the<a name="line.40"></a> +<span class="sourceLineNo">041</span> * servers. It allows to delete immediately the znode when the master or the regions server crashes.<a name="line.41"></a> +<span class="sourceLineNo">042</span> * The region server / master writes a specific file when it starts / becomes main master. When they<a name="line.42"></a> +<span class="sourceLineNo">043</span> * end properly, they delete the file.</p><a name="line.43"></a> +<span class="sourceLineNo">044</span> * <p>In the script, we check for the existence of these files when the program ends. If they still<a name="line.44"></a> +<span class="sourceLineNo">045</span> * exist we conclude that the server crashed, likely without deleting their znode. To have a faster<a name="line.45"></a> +<span class="sourceLineNo">046</span> * recovery we delete immediately the znode.</p><a name="line.46"></a> +<span class="sourceLineNo">047</span> * <p>The strategy depends on the server type. For a region server we store the znode path in the<a name="line.47"></a> +<span class="sourceLineNo">048</span> * file, and use it to delete it. for a master, as the znode path constant whatever the server, we<a name="line.48"></a> +<span class="sourceLineNo">049</span> * check its content to make sure that the backup server is not now in charge.</p><a name="line.49"></a> +<span class="sourceLineNo">050</span> */<a name="line.50"></a> +<span class="sourceLineNo">051</span>public class ZNodeClearer {<a name="line.51"></a> +<span class="sourceLineNo">052</span> private static final Log LOG = LogFactory.getLog(ZNodeClearer.class);<a name="line.52"></a> +<span class="sourceLineNo">053</span><a name="line.53"></a> +<span class="sourceLineNo">054</span> private ZNodeClearer() {}<a name="line.54"></a> +<span class="sourceLineNo">055</span><a name="line.55"></a> +<span class="sourceLineNo">056</span> /**<a name="line.56"></a> +<span class="sourceLineNo">057</span> * Logs the errors without failing on exception.<a name="line.57"></a> +<span class="sourceLineNo">058</span> */<a name="line.58"></a> +<span class="sourceLineNo">059</span> public static void writeMyEphemeralNodeOnDisk(String fileContent) {<a name="line.59"></a> +<span class="sourceLineNo">060</span> String fileName = ZNodeClearer.getMyEphemeralNodeFileName();<a name="line.60"></a> +<span class="sourceLineNo">061</span> if (fileName == null) {<a name="line.61"></a> +<span class="sourceLineNo">062</span> LOG.warn("Environment variable HBASE_ZNODE_FILE not set; znodes will not be cleared " +<a name="line.62"></a> +<span class="sourceLineNo">063</span> "on crash by start scripts (Longer MTTR!)");<a name="line.63"></a> +<span class="sourceLineNo">064</span> return;<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> FileWriter fstream;<a name="line.67"></a> +<span class="sourceLineNo">068</span> try {<a name="line.68"></a> +<span class="sourceLineNo">069</span> fstream = new FileWriter(fileName);<a name="line.69"></a> +<span class="sourceLineNo">070</span> } catch (IOException e) {<a name="line.70"></a> +<span class="sourceLineNo">071</span> LOG.warn("Can't write znode file "+fileName, e);<a name="line.71"></a> +<span class="sourceLineNo">072</span> return;<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> BufferedWriter out = new BufferedWriter(fstream);<a name="line.75"></a> +<span class="sourceLineNo">076</span><a name="line.76"></a> +<span class="sourceLineNo">077</span> try {<a name="line.77"></a> +<span class="sourceLineNo">078</span> try {<a name="line.78"></a> +<span class="sourceLineNo">079</span> out.write(fileContent + "\n");<a name="line.79"></a> +<span class="sourceLineNo">080</span> } finally {<a name="line.80"></a> +<span class="sourceLineNo">081</span> try {<a name="line.81"></a> +<span class="sourceLineNo">082</span> out.close();<a name="line.82"></a> +<span class="sourceLineNo">083</span> } finally {<a name="line.83"></a> +<span class="sourceLineNo">084</span> fstream.close();<a name="line.84"></a> +<span class="sourceLineNo">085</span> }<a name="line.85"></a> +<span class="sourceLineNo">086</span> }<a name="line.86"></a> +<span class="sourceLineNo">087</span> } catch (IOException e) {<a name="line.87"></a> +<span class="sourceLineNo">088</span> LOG.warn("Can't write znode file "+fileName, e);<a name="line.88"></a> +<span class="sourceLineNo">089</span> }<a name="line.89"></a> +<span class="sourceLineNo">090</span> }<a name="line.90"></a> +<span class="sourceLineNo">091</span><a name="line.91"></a> +<span class="sourceLineNo">092</span> /**<a name="line.92"></a> +<span class="sourceLineNo">093</span> * read the content of znode file, expects a single line.<a name="line.93"></a> +<span class="sourceLineNo">094</span> */<a name="line.94"></a> +<span class="sourceLineNo">095</span> public static String readMyEphemeralNodeOnDisk() throws IOException {<a name="line.95"></a> +<span class="sourceLineNo">096</span> String fileName = getMyEphemeralNodeFileName();<a name="line.96"></a> +<span class="sourceLineNo">097</span> if (fileName == null){<a name="line.97"></a> +<span class="sourceLineNo">098</span> throw new FileNotFoundException("No filename; set environment variable HBASE_ZNODE_FILE");<a name="line.98"></a> +<span class="sourceLineNo">099</span> }<a name="line.99"></a> +<span class="sourceLineNo">100</span> FileReader znodeFile = new FileReader(fileName);<a name="line.100"></a> +<span class="sourceLineNo">101</span> BufferedReader br = null;<a name="line.101"></a> +<span class="sourceLineNo">102</span> try {<a name="line.102"></a> +<span class="sourceLineNo">103</span> br = new BufferedReader(znodeFile);<a name="line.103"></a> +<span class="sourceLineNo">104</span> String file_content = br.readLine();<a name="line.104"></a> +<span class="sourceLineNo">105</span> return file_content;<a name="line.105"></a> +<span class="sourceLineNo">106</span> } finally {<a name="line.106"></a> +<span class="sourceLineNo">107</span> if (br != null) br.close();<a name="line.107"></a> +<span class="sourceLineNo">108</span> }<a name="line.108"></a> +<span class="sourceLineNo">109</span> }<a name="line.109"></a> +<span class="sourceLineNo">110</span><a name="line.110"></a> +<span class="sourceLineNo">111</span> /**<a name="line.111"></a> +<span class="sourceLineNo">112</span> * Get the name of the file used to store the znode contents<a name="line.112"></a> +<span class="sourceLineNo">113</span> */<a name="line.113"></a> +<span class="sourceLineNo">114</span> public static String getMyEphemeralNodeFileName() {<a name="line.114"></a> +<span class="sourceLineNo">115</span> return System.getenv().get("HBASE_ZNODE_FILE");<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> * delete the znode file<a name="line.119"></a> +<span class="sourceLineNo">120</span> */<a name="line.120"></a> +<span class="sourceLineNo">121</span> public static void deleteMyEphemeralNodeOnDisk() {<a name="line.121"></a> +<span class="sourceLineNo">122</span> String fileName = getMyEphemeralNodeFileName();<a name="line.122"></a> +<span class="sourceLineNo">123</span><a name="line.123"></a> +<span class="sourceLineNo">124</span> if (fileName != null) {<a name="line.124"></a> +<span class="sourceLineNo">125</span> new File(fileName).delete();<a name="line.125"></a> +<span class="sourceLineNo">126</span> }<a name="line.126"></a> +<span class="sourceLineNo">127</span> }<a name="line.127"></a> +<span class="sourceLineNo">128</span><a name="line.128"></a> +<span class="sourceLineNo">129</span> /**<a name="line.129"></a> +<span class="sourceLineNo">130</span> * See HBASE-14861. We are extracting master ServerName from rsZnodePath<a name="line.130"></a> +<span class="sourceLineNo">131</span> * example: "/hbase/rs/server.example.com,16020,1448266496481"<a name="line.131"></a> +<span class="sourceLineNo">132</span> * @param rsZnodePath from HBASE_ZNODE_FILE<a name="line.132"></a> +<span class="sourceLineNo">133</span> * @return String representation of ServerName or null if fails<a name="line.133"></a> +<span class="sourceLineNo">134</span> */<a name="line.134"></a> +<span class="sourceLineNo">135</span> <a name="line.135"></a> +<span class="sourceLineNo">136</span> public static String parseMasterServerName(String rsZnodePath) {<a name="line.136"></a> +<span class="sourceLineNo">137</span> String masterServerName = null;<a name="line.137"></a> +<span class="sourceLineNo">138</span> try {<a name="line.138"></a> +<span class="sourceLineNo">139</span> String[] rsZnodeParts = rsZnodePath.split("/");<a name="line.139"></a> +<span class="sourceLineNo">140</span> masterServerName = rsZnodeParts[rsZnodeParts.length -1];<a name="line.140"></a> +<span class="sourceLineNo">141</span> } catch (IndexOutOfBoundsException e) {<a name="line.141"></a> +<span class="sourceLineNo">142</span> LOG.warn("String " + rsZnodePath + " has wrong format", e);<a name="line.142"></a> +<span class="sourceLineNo">143</span> }<a name="line.143"></a> +<span class="sourceLineNo">144</span> return masterServerName; <a name="line.144"></a> +<span class="sourceLineNo">145</span> }<a name="line.145"></a> +<span class="sourceLineNo">146</span> <a name="line.146"></a> +<span class="sourceLineNo">147</span> /**<a name="line.147"></a> +<span class="sourceLineNo">148</span> * <a name="line.148"></a> +<span class="sourceLineNo">149</span> * @return true if cluster is configured with master-rs collocation <a name="line.149"></a> +<span class="sourceLineNo">150</span> */<a name="line.150"></a> +<span class="sourceLineNo">151</span> private static boolean tablesOnMaster(Configuration conf) {<a name="line.151"></a> +<span class="sourceLineNo">152</span> boolean tablesOnMaster = true;<a name="line.152"></a> +<span class="sourceLineNo">153</span> String confValue = conf.get(BaseLoadBalancer.TABLES_ON_MASTER);<a name="line.153"></a> +<span class="sourceLineNo">154</span> if (confValue != null && confValue.equalsIgnoreCase("none")) {<a name="line.154"></a> +<span class="sourceLineNo">155</span> tablesOnMaster = false;<a name="line.155"></a> +<span class="sourceLineNo">156</span> }<a name="line.156"></a> +<span class="sourceLineNo">157</span> return tablesOnMaster;<a name="line.157"></a> +<span class="sourceLineNo">158</span> }<a name="line.158"></a> +<span class="sourceLineNo">159</span><a name="line.159"></a> +<span class="sourceLineNo">160</span> /**<a name="line.160"></a> +<span class="sourceLineNo">161</span> * Delete the master znode if its content (ServerName string) is the same<a name="line.161"></a> +<span class="sourceLineNo">162</span> * as the one in the znode file. (env: HBASE_ZNODE_FILE). I case of master-rs<a name="line.162"></a> +<span class="sourceLineNo">163</span> * colloaction we extract ServerName string from rsZnode path.(HBASE-14861)<a name="line.163"></a> +<span class="sourceLineNo">164</span> * @return true on successful deletion, false otherwise.<a name="line.164"></a> +<span class="sourceLineNo">165</span> */<a name="line.165"></a> +<span class="sourceLineNo">166</span> public static boolean clear(Configuration conf) {<a name="line.166"></a> +<span class="sourceLineNo">167</span> Configuration tempConf = new Configuration(conf);<a name="line.167"></a> +<span class="sourceLineNo">168</span> tempConf.setInt("zookeeper.recovery.retry", 0);<a name="line.168"></a> +<span class="sourceLineNo">169</span><a name="line.169"></a> +<span class="sourceLineNo">170</span> ZooKeeperWatcher zkw;<a name="line.170"></a> +<span class="sourceLineNo">171</span> try {<a name="line.171"></a> +<span class="sourceLineNo">172</span> zkw = new ZooKeeperWatcher(tempConf, "clean znode for master",<a name="line.172"></a> +<span class="sourceLineNo">173</span> new Abortable() {<a name="line.173"></a> +<span class="sourceLineNo">174</span> @Override public void abort(String why, Throwable e) {}<a name="line.174"></a> +<span class="sourceLineNo">175</span> @Override public boolean isAborted() { return false; }<a name="line.175"></a> +<span class="sourceLineNo">176</span> });<a name="line.176"></a> +<span class="sourceLineNo">177</span> } catch (IOException e) {<a name="line.177"></a> +<span class="sourceLineNo">178</span> LOG.warn("Can't connect to zookeeper to read the master znode", e);<a name="line.178"></a> +<span class="sourceLineNo">179</span> return false;<a name="line.179"></a> +<span class="sourceLineNo">180</span> }<a name="line.180"></a> +<span class="sourceLineNo">181</span><a name="line.181"></a> +<span class="sourceLineNo">182</span> String znodeFileContent;<a name="line.182"></a> +<span class="sourceLineNo">183</span> try {<a name="line.183"></a> +<span class="sourceLineNo">184</span> znodeFileContent = ZNodeClearer.readMyEphemeralNodeOnDisk();<a name="line.184"></a> +<span class="sourceLineNo">185</span> if (ZNodeClearer.tablesOnMaster(conf)) {<a name="line.185"></a> +<span class="sourceLineNo">186</span> // In case of master crash also remove rsZnode since master is also regionserver<a name="line.186"></a> +<span class="sourceLineNo">187</span> ZKUtil.deleteNodeFailSilent(zkw,<a name="line.187"></a> +<span class="sourceLineNo">188</span> ZNodePaths.joinZNode(zkw.znodePaths.rsZNode, znodeFileContent));<a name="line.188"></a> +<span class="sourceLineNo">189</span> return MasterAddressTracker.deleteIfEquals(zkw,<a name="line.189"></a> +<span class="sourceLineNo">190</span> ZNodeClearer.parseMasterServerName(znodeFileContent));<a name="line.190"></a> +<span class="sourceLineNo">191</span> } else {<a name="line.191"></a> +<span class="sourceLineNo">192</span> return MasterAddressTracker.deleteIfEquals(zkw, znodeFileContent);<a name="line.192"></a> +<span class="sourceLineNo">193</span> }<a name="line.193"></a> +<span class="sourceLineNo">194</span> } catch (FileNotFoundException fnfe) {<a name="line.194"></a> +<span class="sourceLineNo">195</span> // If no file, just keep going -- return success.<a name="line.195"></a> +<span class="sourceLineNo">196</span> LOG.warn("Can't find the znode file; presume non-fatal", fnfe);<a name="line.196"></a> +<span class="sourceLineNo">197</span> return true;<a name="line.197"></a> +<span class="sourceLineNo">198</span> } catch (IOException e) {<a name="line.198"></a> +<span class="sourceLineNo">199</span> LOG.warn("Can't read the content of the znode file", e);<a name="line.199"></a> +<span class="sourceLineNo">200</span> return false;<a name="line.200"></a> +<span class="sourceLineNo">201</span> } catch (KeeperException e) {<a name="line.201"></a> +<span class="sourceLineNo">202</span> LOG.warn("ZooKeeper exception deleting znode", e);<a name="line.202"></a> +<span class="sourceLineNo">203</span> return false;<a name="line.203"></a> +<span class="sourceLineNo">204</span> } finally {<a name="line.204"></a> +<span class="sourceLineNo">205</span> zkw.close();<a name="line.205"></a> +<span class="sourceLineNo">206</span> }<a name="line.206"></a> +<span class="sourceLineNo">207</span> }<a name="line.207"></a> +<span class="sourceLineNo">208</span>}<a name="line.208"></a>
