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From git-site-r...@apache.org
Subject [17/51] [partial] hbase-site git commit: Published site at 82d554e3783372cc6b05489452c815b57c06f6cd.
Date Mon, 24 Jul 2017 19:08:19 GMT
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/2d5075d7/devapidocs/src-html/org/apache/hadoop/hbase/procedure2/ProcedureExecutor.CompletedProcedureRetainer.html
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diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/procedure2/ProcedureExecutor.CompletedProcedureRetainer.html b/devapidocs/src-html/org/apache/hadoop/hbase/procedure2/ProcedureExecutor.CompletedProcedureRetainer.html
new file mode 100644
index 0000000..904b921
--- /dev/null
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/procedure2/ProcedureExecutor.CompletedProcedureRetainer.html
@@ -0,0 +1,2074 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html lang="en">
+<head>
+<title>Source code</title>
+<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style">
+</head>
+<body>
+<div class="sourceContainer">
+<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><a name="line.18"></a>
+<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.procedure2;<a name="line.19"></a>
+<span class="sourceLineNo">020</span><a name="line.20"></a>
+<span class="sourceLineNo">021</span>import org.apache.hadoop.hbase.shaded.com.google.common.annotations.VisibleForTesting;<a name="line.21"></a>
+<span class="sourceLineNo">022</span>import org.apache.hadoop.hbase.shaded.com.google.common.base.Preconditions;<a name="line.22"></a>
+<span class="sourceLineNo">023</span><a name="line.23"></a>
+<span class="sourceLineNo">024</span>import java.io.IOException;<a name="line.24"></a>
+<span class="sourceLineNo">025</span>import java.io.InputStream;<a name="line.25"></a>
+<span class="sourceLineNo">026</span>import java.io.OutputStream;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import java.util.ArrayList;<a name="line.27"></a>
+<span class="sourceLineNo">028</span>import java.util.Arrays;<a name="line.28"></a>
+<span class="sourceLineNo">029</span>import java.util.HashSet;<a name="line.29"></a>
+<span class="sourceLineNo">030</span>import java.util.Iterator;<a name="line.30"></a>
+<span class="sourceLineNo">031</span>import java.util.List;<a name="line.31"></a>
+<span class="sourceLineNo">032</span>import java.util.Map;<a name="line.32"></a>
+<span class="sourceLineNo">033</span>import java.util.Objects;<a name="line.33"></a>
+<span class="sourceLineNo">034</span>import java.util.Set;<a name="line.34"></a>
+<span class="sourceLineNo">035</span>import java.util.concurrent.atomic.AtomicBoolean;<a name="line.35"></a>
+<span class="sourceLineNo">036</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.36"></a>
+<span class="sourceLineNo">037</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.37"></a>
+<span class="sourceLineNo">038</span>import java.util.stream.Collectors;<a name="line.38"></a>
+<span class="sourceLineNo">039</span>import java.util.stream.Stream;<a name="line.39"></a>
+<span class="sourceLineNo">040</span>import java.util.concurrent.ConcurrentHashMap;<a name="line.40"></a>
+<span class="sourceLineNo">041</span>import java.util.concurrent.CopyOnWriteArrayList;<a name="line.41"></a>
+<span class="sourceLineNo">042</span>import java.util.concurrent.DelayQueue;<a name="line.42"></a>
+<span class="sourceLineNo">043</span>import java.util.concurrent.TimeUnit;<a name="line.43"></a>
+<span class="sourceLineNo">044</span><a name="line.44"></a>
+<span class="sourceLineNo">045</span>import org.apache.commons.logging.Log;<a name="line.45"></a>
+<span class="sourceLineNo">046</span>import org.apache.commons.logging.LogFactory;<a name="line.46"></a>
+<span class="sourceLineNo">047</span>import org.apache.hadoop.conf.Configuration;<a name="line.47"></a>
+<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.HConstants;<a name="line.48"></a>
+<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.49"></a>
+<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.classification.InterfaceStability;<a name="line.50"></a>
+<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.exceptions.IllegalArgumentIOException;<a name="line.51"></a>
+<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.procedure2.Procedure.LockState;<a name="line.52"></a>
+<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.procedure2.store.ProcedureStore;<a name="line.53"></a>
+<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.procedure2.store.ProcedureStore.ProcedureIterator;<a name="line.54"></a>
+<span class="sourceLineNo">055</span>import org.apache.hadoop.hbase.procedure2.util.DelayedUtil;<a name="line.55"></a>
+<span class="sourceLineNo">056</span>import org.apache.hadoop.hbase.procedure2.util.DelayedUtil.DelayedWithTimeout;<a name="line.56"></a>
+<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.procedure2.util.StringUtils;<a name="line.57"></a>
+<span class="sourceLineNo">058</span>import org.apache.hadoop.hbase.shaded.protobuf.generated.ProcedureProtos.ProcedureState;<a name="line.58"></a>
+<span class="sourceLineNo">059</span>import org.apache.hadoop.hbase.security.User;<a name="line.59"></a>
+<span class="sourceLineNo">060</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.60"></a>
+<span class="sourceLineNo">061</span>import org.apache.hadoop.hbase.util.NonceKey;<a name="line.61"></a>
+<span class="sourceLineNo">062</span>import org.apache.hadoop.hbase.util.Threads;<a name="line.62"></a>
+<span class="sourceLineNo">063</span><a name="line.63"></a>
+<span class="sourceLineNo">064</span>/**<a name="line.64"></a>
+<span class="sourceLineNo">065</span> * Thread Pool that executes the submitted procedures.<a name="line.65"></a>
+<span class="sourceLineNo">066</span> * The executor has a ProcedureStore associated.<a name="line.66"></a>
+<span class="sourceLineNo">067</span> * Each operation is logged and on restart the pending procedures are resumed.<a name="line.67"></a>
+<span class="sourceLineNo">068</span> *<a name="line.68"></a>
+<span class="sourceLineNo">069</span> * Unless the Procedure code throws an error (e.g. invalid user input)<a name="line.69"></a>
+<span class="sourceLineNo">070</span> * the procedure will complete (at some point in time), On restart the pending<a name="line.70"></a>
+<span class="sourceLineNo">071</span> * procedures are resumed and the once failed will be rolledback.<a name="line.71"></a>
+<span class="sourceLineNo">072</span> *<a name="line.72"></a>
+<span class="sourceLineNo">073</span> * The user can add procedures to the executor via submitProcedure(proc)<a name="line.73"></a>
+<span class="sourceLineNo">074</span> * check for the finished state via isFinished(procId)<a name="line.74"></a>
+<span class="sourceLineNo">075</span> * and get the result via getResult(procId)<a name="line.75"></a>
+<span class="sourceLineNo">076</span> */<a name="line.76"></a>
+<span class="sourceLineNo">077</span>@InterfaceAudience.Private<a name="line.77"></a>
+<span class="sourceLineNo">078</span>@InterfaceStability.Evolving<a name="line.78"></a>
+<span class="sourceLineNo">079</span>public class ProcedureExecutor&lt;TEnvironment&gt; {<a name="line.79"></a>
+<span class="sourceLineNo">080</span>  private static final Log LOG = LogFactory.getLog(ProcedureExecutor.class);<a name="line.80"></a>
+<span class="sourceLineNo">081</span><a name="line.81"></a>
+<span class="sourceLineNo">082</span>  public static final String CHECK_OWNER_SET_CONF_KEY = "hbase.procedure.check.owner.set";<a name="line.82"></a>
+<span class="sourceLineNo">083</span>  private static final boolean DEFAULT_CHECK_OWNER_SET = false;<a name="line.83"></a>
+<span class="sourceLineNo">084</span><a name="line.84"></a>
+<span class="sourceLineNo">085</span>  public static final String WORKER_KEEP_ALIVE_TIME_CONF_KEY =<a name="line.85"></a>
+<span class="sourceLineNo">086</span>      "hbase.procedure.worker.keep.alive.time.msec";<a name="line.86"></a>
+<span class="sourceLineNo">087</span>  private static final long DEFAULT_WORKER_KEEP_ALIVE_TIME = Long.MAX_VALUE;<a name="line.87"></a>
+<span class="sourceLineNo">088</span><a name="line.88"></a>
+<span class="sourceLineNo">089</span>  Testing testing = null;<a name="line.89"></a>
+<span class="sourceLineNo">090</span>  public static class Testing {<a name="line.90"></a>
+<span class="sourceLineNo">091</span>    protected boolean killIfSuspended = false;<a name="line.91"></a>
+<span class="sourceLineNo">092</span>    protected boolean killBeforeStoreUpdate = false;<a name="line.92"></a>
+<span class="sourceLineNo">093</span>    protected boolean toggleKillBeforeStoreUpdate = false;<a name="line.93"></a>
+<span class="sourceLineNo">094</span><a name="line.94"></a>
+<span class="sourceLineNo">095</span>    protected boolean shouldKillBeforeStoreUpdate() {<a name="line.95"></a>
+<span class="sourceLineNo">096</span>      final boolean kill = this.killBeforeStoreUpdate;<a name="line.96"></a>
+<span class="sourceLineNo">097</span>      if (this.toggleKillBeforeStoreUpdate) {<a name="line.97"></a>
+<span class="sourceLineNo">098</span>        this.killBeforeStoreUpdate = !kill;<a name="line.98"></a>
+<span class="sourceLineNo">099</span>        LOG.warn("Toggle KILL before store update to: " + this.killBeforeStoreUpdate);<a name="line.99"></a>
+<span class="sourceLineNo">100</span>      }<a name="line.100"></a>
+<span class="sourceLineNo">101</span>      return kill;<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>    protected boolean shouldKillBeforeStoreUpdate(final boolean isSuspended) {<a name="line.104"></a>
+<span class="sourceLineNo">105</span>      return (isSuspended &amp;&amp; !killIfSuspended) ? false : shouldKillBeforeStoreUpdate();<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>
+<span class="sourceLineNo">108</span><a name="line.108"></a>
+<span class="sourceLineNo">109</span>  public interface ProcedureExecutorListener {<a name="line.109"></a>
+<span class="sourceLineNo">110</span>    void procedureLoaded(long procId);<a name="line.110"></a>
+<span class="sourceLineNo">111</span>    void procedureAdded(long procId);<a name="line.111"></a>
+<span class="sourceLineNo">112</span>    void procedureFinished(long procId);<a name="line.112"></a>
+<span class="sourceLineNo">113</span>  }<a name="line.113"></a>
+<span class="sourceLineNo">114</span><a name="line.114"></a>
+<span class="sourceLineNo">115</span>  private static class CompletedProcedureRetainer {<a name="line.115"></a>
+<span class="sourceLineNo">116</span>    private final Procedure&lt;?&gt; procedure;<a name="line.116"></a>
+<span class="sourceLineNo">117</span>    private long clientAckTime;<a name="line.117"></a>
+<span class="sourceLineNo">118</span><a name="line.118"></a>
+<span class="sourceLineNo">119</span>    public CompletedProcedureRetainer(Procedure&lt;?&gt; procedure) {<a name="line.119"></a>
+<span class="sourceLineNo">120</span>      this.procedure = procedure;<a name="line.120"></a>
+<span class="sourceLineNo">121</span>      clientAckTime = -1;<a name="line.121"></a>
+<span class="sourceLineNo">122</span>    }<a name="line.122"></a>
+<span class="sourceLineNo">123</span><a name="line.123"></a>
+<span class="sourceLineNo">124</span>    public Procedure&lt;?&gt; getProcedure() {<a name="line.124"></a>
+<span class="sourceLineNo">125</span>      return procedure;<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>    public boolean hasClientAckTime() {<a name="line.128"></a>
+<span class="sourceLineNo">129</span>      return clientAckTime != -1;<a name="line.129"></a>
+<span class="sourceLineNo">130</span>    }<a name="line.130"></a>
+<span class="sourceLineNo">131</span><a name="line.131"></a>
+<span class="sourceLineNo">132</span>    public long getClientAckTime() {<a name="line.132"></a>
+<span class="sourceLineNo">133</span>      return clientAckTime;<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 void setClientAckTime(long clientAckTime) {<a name="line.136"></a>
+<span class="sourceLineNo">137</span>      this.clientAckTime = clientAckTime;<a name="line.137"></a>
+<span class="sourceLineNo">138</span>    }<a name="line.138"></a>
+<span class="sourceLineNo">139</span><a name="line.139"></a>
+<span class="sourceLineNo">140</span>    public boolean isExpired(long now, long evictTtl, long evictAckTtl) {<a name="line.140"></a>
+<span class="sourceLineNo">141</span>      return (hasClientAckTime() &amp;&amp; (now - getClientAckTime()) &gt;= evictAckTtl) ||<a name="line.141"></a>
+<span class="sourceLineNo">142</span>        (now - procedure.getLastUpdate()) &gt;= evictTtl;<a name="line.142"></a>
+<span class="sourceLineNo">143</span>    }<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>   * Internal cleaner that removes the completed procedure results after a TTL.<a name="line.147"></a>
+<span class="sourceLineNo">148</span>   * NOTE: This is a special case handled in timeoutLoop().<a name="line.148"></a>
+<span class="sourceLineNo">149</span>   *<a name="line.149"></a>
+<span class="sourceLineNo">150</span>   * &lt;p&gt;Since the client code looks more or less like:<a name="line.150"></a>
+<span class="sourceLineNo">151</span>   * &lt;pre&gt;<a name="line.151"></a>
+<span class="sourceLineNo">152</span>   *   procId = master.doOperation()<a name="line.152"></a>
+<span class="sourceLineNo">153</span>   *   while (master.getProcResult(procId) == ProcInProgress);<a name="line.153"></a>
+<span class="sourceLineNo">154</span>   * &lt;/pre&gt;<a name="line.154"></a>
+<span class="sourceLineNo">155</span>   * The master should not throw away the proc result as soon as the procedure is done<a name="line.155"></a>
+<span class="sourceLineNo">156</span>   * but should wait a result request from the client (see executor.removeResult(procId))<a name="line.156"></a>
+<span class="sourceLineNo">157</span>   * The client will call something like master.isProcDone() or master.getProcResult()<a name="line.157"></a>
+<span class="sourceLineNo">158</span>   * which will return the result/state to the client, and it will mark the completed<a name="line.158"></a>
+<span class="sourceLineNo">159</span>   * proc as ready to delete. note that the client may not receive the response from<a name="line.159"></a>
+<span class="sourceLineNo">160</span>   * the master (e.g. master failover) so, if we delay a bit the real deletion of<a name="line.160"></a>
+<span class="sourceLineNo">161</span>   * the proc result the client will be able to get the result the next try.<a name="line.161"></a>
+<span class="sourceLineNo">162</span>   */<a name="line.162"></a>
+<span class="sourceLineNo">163</span>  private static class CompletedProcedureCleaner&lt;TEnvironment&gt;<a name="line.163"></a>
+<span class="sourceLineNo">164</span>      extends ProcedureInMemoryChore&lt;TEnvironment&gt; {<a name="line.164"></a>
+<span class="sourceLineNo">165</span>    private static final Log LOG = LogFactory.getLog(CompletedProcedureCleaner.class);<a name="line.165"></a>
+<span class="sourceLineNo">166</span><a name="line.166"></a>
+<span class="sourceLineNo">167</span>    private static final String CLEANER_INTERVAL_CONF_KEY = "hbase.procedure.cleaner.interval";<a name="line.167"></a>
+<span class="sourceLineNo">168</span>    private static final int DEFAULT_CLEANER_INTERVAL = 30 * 1000; // 30sec<a name="line.168"></a>
+<span class="sourceLineNo">169</span><a name="line.169"></a>
+<span class="sourceLineNo">170</span>    private static final String EVICT_TTL_CONF_KEY = "hbase.procedure.cleaner.evict.ttl";<a name="line.170"></a>
+<span class="sourceLineNo">171</span>    private static final int DEFAULT_EVICT_TTL = 15 * 60000; // 15min<a name="line.171"></a>
+<span class="sourceLineNo">172</span><a name="line.172"></a>
+<span class="sourceLineNo">173</span>    private static final String EVICT_ACKED_TTL_CONF_KEY ="hbase.procedure.cleaner.acked.evict.ttl";<a name="line.173"></a>
+<span class="sourceLineNo">174</span>    private static final int DEFAULT_ACKED_EVICT_TTL = 5 * 60000; // 5min<a name="line.174"></a>
+<span class="sourceLineNo">175</span><a name="line.175"></a>
+<span class="sourceLineNo">176</span>    private static final String BATCH_SIZE_CONF_KEY = "hbase.procedure.cleaner.evict.batch.size";<a name="line.176"></a>
+<span class="sourceLineNo">177</span>    private static final int DEFAULT_BATCH_SIZE = 32;<a name="line.177"></a>
+<span class="sourceLineNo">178</span><a name="line.178"></a>
+<span class="sourceLineNo">179</span>    private final Map&lt;Long, CompletedProcedureRetainer&gt; completed;<a name="line.179"></a>
+<span class="sourceLineNo">180</span>    private final Map&lt;NonceKey, Long&gt; nonceKeysToProcIdsMap;<a name="line.180"></a>
+<span class="sourceLineNo">181</span>    private final ProcedureStore store;<a name="line.181"></a>
+<span class="sourceLineNo">182</span>    private Configuration conf;<a name="line.182"></a>
+<span class="sourceLineNo">183</span><a name="line.183"></a>
+<span class="sourceLineNo">184</span>    public CompletedProcedureCleaner(final Configuration conf, final ProcedureStore store,<a name="line.184"></a>
+<span class="sourceLineNo">185</span>        final Map&lt;Long, CompletedProcedureRetainer&gt; completedMap,<a name="line.185"></a>
+<span class="sourceLineNo">186</span>        final Map&lt;NonceKey, Long&gt; nonceKeysToProcIdsMap) {<a name="line.186"></a>
+<span class="sourceLineNo">187</span>      // set the timeout interval that triggers the periodic-procedure<a name="line.187"></a>
+<span class="sourceLineNo">188</span>      super(conf.getInt(CLEANER_INTERVAL_CONF_KEY, DEFAULT_CLEANER_INTERVAL));<a name="line.188"></a>
+<span class="sourceLineNo">189</span>      this.completed = completedMap;<a name="line.189"></a>
+<span class="sourceLineNo">190</span>      this.nonceKeysToProcIdsMap = nonceKeysToProcIdsMap;<a name="line.190"></a>
+<span class="sourceLineNo">191</span>      this.store = store;<a name="line.191"></a>
+<span class="sourceLineNo">192</span>      this.conf = conf;<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>    @Override<a name="line.195"></a>
+<span class="sourceLineNo">196</span>    protected void periodicExecute(final TEnvironment env) {<a name="line.196"></a>
+<span class="sourceLineNo">197</span>      if (completed.isEmpty()) {<a name="line.197"></a>
+<span class="sourceLineNo">198</span>        if (LOG.isTraceEnabled()) {<a name="line.198"></a>
+<span class="sourceLineNo">199</span>          LOG.trace("No completed procedures to cleanup.");<a name="line.199"></a>
+<span class="sourceLineNo">200</span>        }<a name="line.200"></a>
+<span class="sourceLineNo">201</span>        return;<a name="line.201"></a>
+<span class="sourceLineNo">202</span>      }<a name="line.202"></a>
+<span class="sourceLineNo">203</span><a name="line.203"></a>
+<span class="sourceLineNo">204</span>      final long evictTtl = conf.getInt(EVICT_TTL_CONF_KEY, DEFAULT_EVICT_TTL);<a name="line.204"></a>
+<span class="sourceLineNo">205</span>      final long evictAckTtl = conf.getInt(EVICT_ACKED_TTL_CONF_KEY, DEFAULT_ACKED_EVICT_TTL);<a name="line.205"></a>
+<span class="sourceLineNo">206</span>      final int batchSize = conf.getInt(BATCH_SIZE_CONF_KEY, DEFAULT_BATCH_SIZE);<a name="line.206"></a>
+<span class="sourceLineNo">207</span><a name="line.207"></a>
+<span class="sourceLineNo">208</span>      final long[] batchIds = new long[batchSize];<a name="line.208"></a>
+<span class="sourceLineNo">209</span>      int batchCount = 0;<a name="line.209"></a>
+<span class="sourceLineNo">210</span><a name="line.210"></a>
+<span class="sourceLineNo">211</span>      final long now = EnvironmentEdgeManager.currentTime();<a name="line.211"></a>
+<span class="sourceLineNo">212</span>      final Iterator&lt;Map.Entry&lt;Long, CompletedProcedureRetainer&gt;&gt; it = completed.entrySet().iterator();<a name="line.212"></a>
+<span class="sourceLineNo">213</span>      final boolean debugEnabled = LOG.isDebugEnabled();<a name="line.213"></a>
+<span class="sourceLineNo">214</span>      while (it.hasNext() &amp;&amp; store.isRunning()) {<a name="line.214"></a>
+<span class="sourceLineNo">215</span>        final Map.Entry&lt;Long, CompletedProcedureRetainer&gt; entry = it.next();<a name="line.215"></a>
+<span class="sourceLineNo">216</span>        final CompletedProcedureRetainer retainer = entry.getValue();<a name="line.216"></a>
+<span class="sourceLineNo">217</span>        final Procedure&lt;?&gt; proc = retainer.getProcedure();<a name="line.217"></a>
+<span class="sourceLineNo">218</span><a name="line.218"></a>
+<span class="sourceLineNo">219</span>        // TODO: Select TTL based on Procedure type<a name="line.219"></a>
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+<span class="sourceLineNo">235</span>        }<a name="line.235"></a>
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+<span class="sourceLineNo">242</span><a name="line.242"></a>
+<span class="sourceLineNo">243</span>  /**<a name="line.243"></a>
+<span class="sourceLineNo">244</span>   * Map the the procId returned by submitProcedure(), the Root-ProcID, to the ProcedureInfo.<a name="line.244"></a>
+<span class="sourceLineNo">245</span>   * Once a Root-Procedure completes (success or failure), the result will be added to this map.<a name="line.245"></a>
+<span class="sourceLineNo">246</span>   * The user of ProcedureExecutor should call getResult(procId) to get the result.<a name="line.246"></a>
+<span class="sourceLineNo">247</span>   */<a name="line.247"></a>
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+<span class="sourceLineNo">249</span><a name="line.249"></a>
+<span class="sourceLineNo">250</span>  /**<a name="line.250"></a>
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+<span class="sourceLineNo">252</span>   * The RootProcedureState contains the execution stack of the Root-Procedure,<a name="line.252"></a>
+<span class="sourceLineNo">253</span>   * It is added to the map by submitProcedure() and removed on procedure completion.<a name="line.253"></a>
+<span class="sourceLineNo">254</span>   */<a name="line.254"></a>
+<span class="sourceLineNo">255</span>  private final ConcurrentHashMap&lt;Long, RootProcedureState&gt; rollbackStack = new ConcurrentHashMap&lt;&gt;();<a name="line.255"></a>
+<span class="sourceLineNo">256</span><a name="line.256"></a>
+<span class="sourceLineNo">257</span>  /**<a name="line.257"></a>
+<span class="sourceLineNo">258</span>   * Helper map to lookup the live procedures by ID.<a name="line.258"></a>
+<span class="sourceLineNo">259</span>   * This map contains every procedure. root-procedures and subprocedures.<a name="line.259"></a>
+<span class="sourceLineNo">260</span>   */<a name="line.260"></a>
+<span class="sourceLineNo">261</span>  private final ConcurrentHashMap&lt;Long, Procedure&gt; procedures = new ConcurrentHashMap&lt;&gt;();<a name="line.261"></a>
+<span class="sourceLineNo">262</span><a name="line.262"></a>
+<span class="sourceLineNo">263</span>  /**<a name="line.263"></a>
+<span class="sourceLineNo">264</span>   * Helper map to lookup whether the procedure already issued from the same client.<a name="line.264"></a>
+<span class="sourceLineNo">265</span>   * This map contains every root procedure.<a name="line.265"></a>
+<span class="sourceLineNo">266</span>   */<a name="line.266"></a>
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+<span class="sourceLineNo">268</span><a name="line.268"></a>
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+<span class="sourceLineNo">270</span><a name="line.270"></a>
+<span class="sourceLineNo">271</span>  private Configuration conf;<a name="line.271"></a>
+<span class="sourceLineNo">272</span>  private ThreadGroup threadGroup;<a name="line.272"></a>
+<span class="sourceLineNo">273</span>  private CopyOnWriteArrayList&lt;WorkerThread&gt; workerThreads;<a name="line.273"></a>
+<span class="sourceLineNo">274</span>  private TimeoutExecutorThread timeoutExecutor;<a name="line.274"></a>
+<span class="sourceLineNo">275</span>  private int corePoolSize;<a name="line.275"></a>
+<span class="sourceLineNo">276</span><a name="line.276"></a>
+<span class="sourceLineNo">277</span>  private volatile long keepAliveTime = Long.MAX_VALUE;<a name="line.277"></a>
+<span class="sourceLineNo">278</span><a name="line.278"></a>
+<span class="sourceLineNo">279</span>  /**<a name="line.279"></a>
+<span class="sourceLineNo">280</span>   * Scheduler/Queue that contains runnable procedures.<a name="line.280"></a>
+<span class="sourceLineNo">281</span>   */<a name="line.281"></a>
+<span class="sourceLineNo">282</span>  private final ProcedureScheduler scheduler;<a name="line.282"></a>
+<span class="sourceLineNo">283</span><a name="line.283"></a>
+<span class="sourceLineNo">284</span>  private final AtomicLong lastProcId = new AtomicLong(-1);<a name="line.284"></a>
+<span class="sourceLineNo">285</span>  private final AtomicLong workerId = new AtomicLong(0);<a name="line.285"></a>
+<span class="sourceLineNo">286</span>  private final AtomicInteger activeExecutorCount = new AtomicInteger(0);<a name="line.286"></a>
+<span class="sourceLineNo">287</span>  private final AtomicBoolean running = new AtomicBoolean(false);<a name="line.287"></a>
+<span class="sourceLineNo">288</span>  private final TEnvironment environment;<a name="line.288"></a>
+<span class="sourceLineNo">289</span>  private final ProcedureStore store;<a name="line.289"></a>
+<span class="sourceLineNo">290</span><a name="line.290"></a>
+<span class="sourceLineNo">291</span>  private final boolean checkOwnerSet;<a name="line.291"></a>
+<span class="sourceLineNo">292</span><a name="line.292"></a>
+<span class="sourceLineNo">293</span>  public ProcedureExecutor(final Configuration conf, final TEnvironment environment,<a name="line.293"></a>
+<span class="sourceLineNo">294</span>      final ProcedureStore store) {<a name="line.294"></a>
+<span class="sourceLineNo">295</span>    this(conf, environment, store, new SimpleProcedureScheduler());<a name="line.295"></a>
+<span class="sourceLineNo">296</span>  }<a name="line.296"></a>
+<span class="sourceLineNo">297</span><a name="line.297"></a>
+<span class="sourceLineNo">298</span>  public ProcedureExecutor(final Configuration conf, final TEnvironment environment,<a name="line.298"></a>
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+<span class="sourceLineNo">303</span>    this.conf = conf;<a name="line.303"></a>
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+<span class="sourceLineNo">306</span>  }<a name="line.306"></a>
+<span class="sourceLineNo">307</span><a name="line.307"></a>
+<span class="sourceLineNo">308</span>  private void load(final boolean abortOnCorruption) throws IOException {<a name="line.308"></a>
+<span class="sourceLineNo">309</span>    Preconditions.checkArgument(completed.isEmpty(), "completed not empty");<a name="line.309"></a>
+<span class="sourceLineNo">310</span>    Preconditions.checkArgument(rollbackStack.isEmpty(), "rollback state not empty");<a name="line.310"></a>
+<span class="sourceLineNo">311</span>    Preconditions.checkArgument(procedures.isEmpty(), "procedure map not empty");<a name="line.311"></a>
+<span class="sourceLineNo">312</span>    Preconditions.checkArgument(scheduler.size() == 0, "run queue not empty");<a name="line.312"></a>
+<span class="sourceLineNo">313</span><a name="line.313"></a>
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+<span class="sourceLineNo">318</span>        LOG.debug("Load maxProcId=" + maxProcId);<a name="line.318"></a>
+<span class="sourceLineNo">319</span>        lastProcId.set(maxProcId);<a name="line.319"></a>
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+<span class="sourceLineNo">322</span>      @Override<a name="line.322"></a>
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+<span class="sourceLineNo">326</span><a name="line.326"></a>
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+<span class="sourceLineNo">338</span>      }<a name="line.338"></a>
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+<span class="sourceLineNo">341</span><a name="line.341"></a>
+<span class="sourceLineNo">342</span>  private void loadProcedures(final ProcedureIterator procIter,<a name="line.342"></a>
+<span class="sourceLineNo">343</span>      final boolean abortOnCorruption) throws IOException {<a name="line.343"></a>
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+<span class="sourceLineNo">352</span>      long procId = proc.getProcId();<a name="line.352"></a>
+<span class="sourceLineNo">353</span><a name="line.353"></a>
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+<span class="sourceLineNo">356</span>        if (debugEnabled) {<a name="line.356"></a>
+<span class="sourceLineNo">357</span>          LOG.debug("Completed " + proc);<a name="line.357"></a>
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+<span class="sourceLineNo">363</span>        }<a name="line.363"></a>
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+<span class="sourceLineNo">365</span>        // add the procedure to the map<a name="line.365"></a>
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+<span class="sourceLineNo">368</span><a name="line.368"></a>
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+<span class="sourceLineNo">372</span>      }<a name="line.372"></a>
+<span class="sourceLineNo">373</span><a name="line.373"></a>
+<span class="sourceLineNo">374</span>      // add the nonce to the map<a name="line.374"></a>
+<span class="sourceLineNo">375</span>      if (nonceKey != null) {<a name="line.375"></a>
+<span class="sourceLineNo">376</span>        nonceKeysToProcIdsMap.put(nonceKey, procId);<a name="line.376"></a>
+<span class="sourceLineNo">377</span>      }<a name="line.377"></a>
+<span class="sourceLineNo">378</span>    }<a name="line.378"></a>
+<span class="sourceLineNo">379</span><a name="line.379"></a>
+<span class="sourceLineNo">380</span>    // 2. Initialize the stacks<a name="line.380"></a>
+<span class="sourceLineNo">381</span>    final ArrayList&lt;Procedure&gt; runnableList = new ArrayList(runnablesCount);<a name="line.381"></a>
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+<span class="sourceLineNo">383</span>    procIter.reset();<a name="line.383"></a>
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+<span class="sourceLineNo">386</span>        procIter.skipNext();<a name="line.386"></a>
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+<span class="sourceLineNo">388</span>      }<a name="line.388"></a>
+<span class="sourceLineNo">389</span><a name="line.389"></a>
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+<span class="sourceLineNo">392</span><a name="line.392"></a>
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+<span class="sourceLineNo">394</span>        LOG.debug(String.format("Loading %s", proc));<a name="line.394"></a>
+<span class="sourceLineNo">395</span>      }<a name="line.395"></a>
+<span class="sourceLineNo">396</span><a name="line.396"></a>
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+<span class="sourceLineNo">399</span>        // The 'proc' was ready to run but the root procedure was rolledback?<a name="line.399"></a>
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+<span class="sourceLineNo">401</span>        continue;<a name="line.401"></a>
+<span class="sourceLineNo">402</span>      }<a name="line.402"></a>
+<span class="sourceLineNo">403</span><a name="line.403"></a>
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+<span class="sourceLineNo">406</span>        // corrupted procedures are handled later at step 3<a name="line.406"></a>
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+<span class="sourceLineNo">411</span><a name="line.411"></a>
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+<span class="sourceLineNo">436</span>        case INITIALIZING:<a name="line.436"></a>
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+<span class="sourceLineNo">438</span>          LOG.error(msg);<a name="line.438"></a>
+<span class="sourceLineNo">439</span>          throw new UnsupportedOperationException(msg);<a name="line.439"></a>
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+<span class="sourceLineNo">705</span>   * and submit the procedure.<a name="line.705"></a>
+<span class="sourceLineNo">706</span>   *<a name="line.706"></a>
+<span class="sourceLineNo">707</span>   * @param nonceKey A unique identifier for this operation from the client or process.<a name="line.707"></a>
+<span class="sourceLineNo">708</span>   * @return the procId associated with the nonce, if any otherwise an invalid procId.<a name="line.708"></a>
+<span class="sourceLineNo">709</span>   */<a name="line.709"></a>
+<span class="sourceLineNo">710</span>  public long registerNonce(final NonceKey nonceKey) {<a name="line.710"></a>
+<span class="sourceLineNo">711</span>    if (nonceKey == null) return -1;<a name="line.711"></a>
+<span class="sourceLineNo">712</span><a name="line.712"></a>
+<span class="sourceLineNo">713</span>    // check if we have already a Reserved ID for the nonce<a name="line.713"></a>
+<span class="sourceLineNo">714</span>    Long oldProcId = nonceKeysToProcIdsMap.get(nonceKey);<a name="line.714"></a>
+<span class="sourceLineNo">715</span>    if (oldProcId == null) {<a name="line.715"></a>
+<span class="sourceLineNo">716</span>      // reserve a new Procedure ID, this will be associated with the nonce<a name="line.716"></a>
+<span class="sourceLineNo">717</span>      // and the procedure submitted with the specified nonce will use this ID.<a name="line.717"></a>
+<span class="sourceLineNo">718</span>      final long newProcId = nextProcId();<a name="line.718"></a>
+<span class="sourceLineNo">719</span>      oldProcId = nonceKeysToProcIdsMap.putIfAbsent(nonceKey, newProcId);<a name="line.719"></a>
+<span class="sourceLineNo">720</span>      if (oldProcId == null) return -1;<a name="line.720"></a>
+<span class="sourceLineNo">721</span>    }<a name="line.721"></a>
+<span class="sourceLineNo">722</span><a name="line.722"></a>
+<span class="sourceLineNo">723</span>    // we found a registered nonce, but the procedure may not have been submitted yet.<a name="line.723"></a>
+<span class="sourceLineNo">724</span>    // since the client expect the procedure to be submitted, spin here until it is.<a name="line.724"></a>
+<span class="sourceLineNo">725</span>    final boolean traceEnabled = LOG.isTraceEnabled();<a name="line.725"></a>
+<span class="sourceLineNo">726</span>    while (isRunning() &amp;&amp;<a name="line.726"></a>
+<span class="sourceLineNo">727</span>           !(procedures.containsKey(oldProcId) || completed.containsKey(oldProcId)) &amp;&amp;<a name="line.727"></a>
+<span class="sourceLineNo">728</span>           nonceKeysToProcIdsMap.containsKey(nonceKey)) {<a name="line.728"></a>
+<span class="sourceLineNo">729</span>      if (traceEnabled) {<a name="line.729"></a>
+<span class="sourceLineNo">730</span>        LOG.trace("Waiting for procId=" + oldProcId.longValue() + " to be submitted");<a name="line.730"></a>
+<span class="sourceLineNo">731</span>      }<a name="line.731"></a>
+<span class="sourceLineNo">732</span>      Threads.sleep(100);<a name="line.732"></a>
+<span class="sourceLineNo">733</span>    }<a name="line.733"></a>
+<span class="sourceLineNo">734</span>    return oldProcId.longValue();<a name="line.734"></a>
+<span class="sourceLineNo">735</span>  }<a name="line.735"></a>
+<span class="sourceLineNo">736</span><a name="line.736"></a>
+<span class="sourceLineNo">737</span>  /**<a name="line.737"></a>
+<span class="sourceLineNo">738</span>   * Remove the NonceKey if the procedure was not submitted to the executor.<a name="line.738"></a>
+<span class="sourceLineNo">739</span>   * @param nonceKey A unique identifier for this operation from the client or process.<a name="line.739"></a>
+<span class="sourceLineNo">740</span>   */<a name="line.740"></a>
+<span class="sourceLineNo">741</span>  public void unregisterNonceIfProcedureWasNotSubmitted(final NonceKey nonceKey) {<a name="line.741"></a>
+<span class="sourceLineNo">742</span>    if (nonceKey == null) return;<a name="line.742"></a>
+<span class="sourceLineNo">743</span><a name="line.743"></a>
+<span class="sourceLineNo">744</span>    final Long procId = nonceKeysToProcIdsMap.get(nonceKey);<a name="line.744"></a>
+<span class="sourceLineNo">745</span>    if (procId == null) return;<a name="line.745"></a>
+<span class="sourceLineNo">746</span><a name="line.746"></a>
+<span class="sourceLineNo">747</span>    // if the procedure was not submitted, remove the nonce<a name="line.747"></a>
+<span class="sourceLineNo">748</span>    if (!(procedures.containsKey(procId) || completed.containsKey(procId))) {<a name="line.748"></a>
+<span class="sourceLineNo">749</span>      nonceKeysToProcIdsMap.remove(nonceKey);<a name="line.749"></a>
+<span class="sourceLineNo">750</span>    }<a name="line.750"></a>
+<span class="sourceLineNo">751</span>  }<a name="line.751"></a>
+<span class="sourceLineNo">752</span><a name="line.752"></a>
+<span class="sourceLineNo">753</span>  private static class FailedProcedure&lt;TEnvironment&gt; extends Procedure&lt;TEnvironment&gt; {<a name="line.753"></a>
+<span class="sourceLineNo">754</span>    private String procName;<a name="line.754"></a>
+<span class="sourceLineNo">755</span><a name="line.755"></a>
+<span class="sourceLineNo">756</span>    public FailedProcedure(NonceKey nonceKey, String procName, User owner,<a name="line.756"></a>
+<span class="sourceLineNo">757</span>        IOException exception) {<a name="line.757"></a>
+<span class="sourceLineNo">758</span>      this.procName = procName;<a name="line.758"></a>
+<span class="sourceLineNo">759</span>      setNonceKey(nonceKey);<a name="line.759"></a>
+<span class="sourceLineNo">760</span>      setOwner(owner);<a name="line.760"></a>
+<span class="sourceLineNo">761</span>      setFailure(Objects.toString(exception.getMessage(), ""), exception);<a name="line.761"></a>
+<span class="sourceLineNo">762</span>    }<a name="line.762"></a>
+<span class="sourceLineNo">763</span><a name="line.763"></a>
+<span class="sourceLineNo">764</span>    @Override<a name="line.764"></a>
+<span class="sourceLineNo">765</span>    public String getProcName() {<a name="line.765"></a>
+<span class="sourceLineNo">766</span>      return procName;<a name="line.766"></a>
+<span class="sourceLineNo">767</span>    }<a name="line.767"></a>
+<span class="sourceLineNo">768</span><a name="line.768"></a>
+<span class="sourceLineNo">769</span>    @Override<a name="line.769"></a>
+<span class="sourceLineNo">770</span>    protected Procedure&lt;TEnvironment&gt;[] execute(TEnvironment env)<a name="line.770"></a>
+<span class="sourceLineNo">771</span>        throws ProcedureYieldException, ProcedureSuspendedException,<a name="line.771"></a>
+<span class="sourceLineNo">772</span>        InterruptedException {<a name="line.772"></a>
+<span class="sourceLineNo">773</span>      throw new UnsupportedOperationException();<a name="line.773"></a>
+<span class="sourceLineNo">774</span>    }<a name="line.774"></a>
+<span class="sourceLineNo">775</span><a name="line.775"></a>
+<span class="sourceLineNo">776</span>    @Override<a name="line.776"></a>
+<span class="sourceLineNo">777</span>    protected void rollback(TEnvironment env)<a name="line.777"></a>
+<span class="sourceLineNo">778</span>        throws IOException, InterruptedException {<a name="line.778"></a>
+<span class="sourceLineNo">779</span>      throw new UnsupportedOperationException();<a name="line.779"></a>
+<span class="sourceLineNo">780</span>    }<a name="line.780"></a>
+<span class="sourceLineNo">781</span><a name="line.781"></a>
+<span class="sourceLineNo">782</span>    @Override<a name="line.782"></a>
+<span class="sourceLineNo">783</span>    protected boolean abort(TEnvironment env) {<a name="line.783"></a>
+<span class="sourceLineNo">784</span>      throw new UnsupportedOperationException();<a name="line.784"></a>
+<span class="sourceLineNo">785</span>    }<a name="line.785"></a>
+<span class="sourceLineNo">786</span><a name="line.786"></a>
+<span class="sourceLineNo">787</span>    @Override<a name="line.787"></a>
+<span class="sourceLineNo">788</span>    protected void serializeStateData(OutputStream stream) throws IOException {<a name="line.788"></a>
+<span class="sourceLineNo">789</span>    }<a name="line.789"></a>
+<span class="sourceLineNo">790</span><a name="line.790"></a>
+<span class="sourceLineNo">791</span>    @Override<a name="line.791"></a>
+<span class="sourceLineNo">792</span>    protected void deserializeStateData(InputStream stream) throws IOException {<a name="line.792"></a>
+<span class="sourceLineNo">793</span>    }<a name="line.793"></a>
+<span class="sourceLineNo">794</span>  }<a name="line.794"></a>
+<span class="sourceLineNo">795</span><a name="line.795"></a>
+<span class="sourceLineNo">796</span>  /**<a name="line.796"></a>
+<span class="sourceLineNo">797</span>   * If the failure failed before submitting it, we may want to give back the<a name="line.797"></a>
+<span class="sourceLineNo">798</span>   * same error to the requests with the same nonceKey.<a name="line.798"></a>
+<span class="sourceLineNo">799</span>   *<a name="line.799"></a>
+<span class="sourceLineNo">800</span>   * @param nonceKey A unique identifier for this operation from the client or process<a name="line.800"></a>
+<span class="sourceLineNo">801</span>   * @param procName name of the procedure, used to inform the user<a name="line.801"></a>
+<span class="sourceLineNo">802</span>   * @param procOwner name of the owner of the procedure, used to inform the user<a name="line.802"></a>
+<span class="sourceLineNo">803</span>   * @param exception the failure to report to the user<a name="line.803"></a>
+<span class="sourceLineNo">804</span>   */<a name="line.804"></a>
+<span class="sourceLineNo">805</span>  public void setFailureResultForNonce(final NonceKey nonceKey, final String procName,<a name="line.805"></a>
+<span class="sourceLineNo">806</span>      final User procOwner, final IOException exception) {<a name="line.806"></a>
+<span class="sourceLineNo">807</span>    if (nonceKey == null) return;<a name="line.807"></a>
+<span class="sourceLineNo">808</span><a name="line.808"></a>
+<span class="sourceLineNo">809</span>    final Long procId = nonceKeysToProcIdsMap.get(nonceKey);<a name="line.809"></a>
+<span class="sourceLineNo">810</span>    if (procId == null || completed.containsKey(procId)) return;<a name="line.810"></a>
+<span class="sourceLineNo">811</span><a name="line.811"></a>
+<span class="sourceLineNo">812</span>    Procedure proc = new FailedProcedure(nonceKey, procName, procOwner, exception);<a name="line.812"></a>
+<span class="sourceLineNo">813</span>    completed.putIfAbsent(procId, new CompletedProcedureRetainer(proc));<a name="line.813"></a>
+<span class="sourceLineNo">814</span>  }<a name="line.814"></a>
+<span class="sourceLineNo">815</span><a name="line.815"></a>
+<span class="sourceLineNo">816</span>  // ==========================================================================<a name="line.816"></a>
+<span class="sourceLineNo">817</span>  //  Submit/Abort Procedure<a name="line.817"></a>
+<span class="sourceLineNo">818</span>  // ==========================================================================<a name="line.818"></a>
+<span class="sourceLineNo">819</span>  /**<a name="line.819"></a>
+<span class="sourceLineNo">820</span>   * Add a new root-procedure to the executor.<a name="line.820"></a>
+<span class="sourceLineNo">821</span>   * @param proc the new procedure to execute.<a name="line.821"></a>
+<span class="sourceLineNo">822</span>   * @return the procedure id, that can be used to monitor the operation<a name="line.822"></a>
+<span class="sourceLineNo">823</span>   */<a name="line.823"></a>
+<span class="sourceLineNo">824</span>  public long submitProcedure(final Procedure proc) {<a name="line.824"></a>
+<span class="sourceLineNo">825</span>    return submitProcedure(proc, null);<a name="line.825"></a>
+<span class="sourceLineNo">826</span>  }<a name="line.826"></a>
+<span class="sourceLineNo">827</span><a name="line.827"></a>
+<span class="sourceLineNo">828</span>  /**<a name="line.828"></a>
+<span class="sourceLineNo">829</span>   * Add a new root-procedure to the executor.<a name="line.829"></a>
+<span class="sourceLineNo">830</span>   * @param proc the new procedure to execute.<a name="line.830"></a>
+<span class="sourceLineNo">831</span>   * @param nonceKey the registered unique identifier for this operation from the client or process.<a name="line.831"></a>
+<span class="sourceLineNo">832</span>   * @return the procedure id, that can be used to monitor the operation<a name="line.832"></a>
+<span class="sourceLineNo">833</span>   */<a name="line.833"></a>
+<span class="sourceLineNo">834</span>  @edu.umd.cs.findbugs.annotations.SuppressWarnings(value="NP_NULL_ON_SOME_PATH",<a name="line.834"></a>
+<span class="sourceLineNo">835</span>      justification = "FindBugs is blind to the check-for-null")<a name="line.835"></a>
+<span class="sourceLineNo">836</span>  public long submitProcedure(final Procedure proc, final NonceKey nonceKey) {<a name="line.836"></a>
+<span class="sourceLineNo">837</span>    Preconditions.checkArgument(lastProcId.get() &gt;= 0);<a name="line.837"></a>
+<span class="sourceLineNo">838</span>    Preconditions.checkArgument(isRunning(), "executor not running");<a name="line.838"></a>
+<span class="sourceLineNo">839</span><a name="line.839"></a>
+<span class="sourceLineNo">840</span>    prepareProcedure(proc);<a name="line.840"></a>
+<span class="sourceLineNo">841</span><a name="line.841"></a>
+<span class="sourceLineNo">842</span>    final Long currentProcId;<a name="line.842"></a>
+<span class="sourceLineNo">843</span>    if (nonceKey != null) {<a name="line.843"></a>
+<span class="sourceLineNo">844</span>      currentProcId = nonceKeysToProcIdsMap.get(nonceKey);<a name="line.844"></a>
+<span class="sourceLineNo">845</span>      Preconditions.checkArgument(currentProcId != null,<a name="line.845"></a>
+<span class="sourceLineNo">846</span>        "Expected nonceKey=" + nonceKey + " to be reserved, use registerNonce(); proc=" + proc);<a name="line.846"></a>
+<span class="sourceLineNo">847</span>    } else {<a name="line.847"></a>
+<span class="sourceLineNo">848</span>      currentProcId = nextProcId();<a name="line.848"></a>
+<span class="sourceLineNo">849</span>    }<a name="line.849"></a>
+<span class="sourceLineNo">850</span><a name="line.850"></a>
+<span class="sourceLineNo">851</span>    // Initialize the procedure<a name="line.851"></a>
+<span class="sourceLineNo">852</span>    proc.setNonceKey(nonceKey);<a name="line.852"></a>
+<span class="sourceLineNo">853</span>    proc.setProcId(currentProcId.longValue());<a name="line.853"></a>
+<span class="sourceLineNo">854</span><a name="line.854"></a>
+<span class="sourceLineNo">855</span>    // Commit the transaction<a name="line.855"></a>
+<span class="sourceLineNo">856</span>    store.insert(proc, null);<a name="line.856"></a>
+<span class="sourceLineNo">857</span>    if (LOG.isDebugEnabled()) {<a name="line.857"></a>
+<span class="sourceLineNo">858</span>      LOG.debug("Stored " + proc);<a name="line.858"></a>
+<span class="sourceLineNo">859</span>    }<a name="line.859"></a>
+<span class="sourceLineNo">860</span><a name="line.860"></a>
+<span class="sourceLineNo">861</span>    // Add the procedure to the executor<a name="line.861"></a>
+<span class="sourceLineNo">862</span>    return pushProcedure(proc);<a name="line.862"></a>
+<span class="sourceLineNo">863</span>  }<a name="line.863"></a>
+<span class="sourceLineNo">864</span><a name="line.864"></a>
+<span class="sourceLineNo">865</span>  /**<a name="line.865"></a>
+<span class="sourceLineNo">866</span>   * Add a set of new root-procedure to the executor.<a name="line.866"></a>
+<span class="sourceLineNo">867</span>   * @param procs the new procedures to execute.<a name="line.867"></a>
+<span class="sourceLineNo">868</span>   */<a name="line.868"></a>
+<span class="sourceLineNo">869</span>  // TODO: Do we need to take nonces here?<a name="line.869"></a>
+<span class="sourceLineNo">870</span>  public void submitProcedures(final Procedure[] procs) {<a name="line.870"></a>
+<span class="sourceLineNo">871</span>    Preconditions.checkArgument(lastProcId.get() &gt;= 0);<a name="line.871"></a>
+<span class="sourceLineNo">872</span>    Preconditions.checkArgument(isRunning(), "executor not running");<a name="line.872"></a>
+<span class="sourceLineNo">873</span><a name="line.873"></a>
+<span class="sourceLineNo">874</span>    // Prepare procedure<a name="line.874"></a>
+<span class="sourceLineNo">875</span>    for (int i = 0; i &lt; procs.length; ++i) {<a name="line.875"></a>
+<span class="sourceLineNo">876</span>      prepareProcedure(procs[i]).setProcId(nextProcId());<a name="line.876"></a>
+<span class="sourceLineNo">877</span>    }<a name="line.877"></a>
+<span class="sourceLineNo">878</span><a name="line.878"></a>
+<span class="sourceLineNo">879</span>    // Commit the transaction<a name="line.879"></a>
+<span class="sourceLineNo">880</span>    store.insert(procs);<a name="line.880"></a>
+<span class="sourceLineNo">881</span>    if (LOG.isDebugEnabled()) {<a name="line.881"></a>
+<span class="sourceLineNo">882</span>      LOG.debug("Stored " + Arrays.toString(procs));<a name="line.882"></a>
+<span class="sourceLineNo">883</span>    }<a name="line.883"></a>
+<span class="sourceLineNo">884</span><a name="line.884"></a>
+<span class="sourceLineNo">885</span>    // Add the procedure to the executor<a name="line.885"></a>
+<span class="sourceLineNo">886</span>    for (int i = 0; i &lt; procs.length; ++i) {<a name="line.886"></a>
+<span class="sourceLineNo">887</span>      pushProcedure(procs[i]);<a name="line.887"></a>
+<span class="sourceLineNo">888</span>    }<a name="line.888"></a>
+<span class="sourceLineNo">889</span>  }<a name="line.889"></a>
+<span class="sourceLineNo">890</span><a name="line.890"></a>
+<span class="sourceLineNo">891</span>  private Procedure prepareProcedure(final Procedure proc) {<a name="line.891"></a>
+<span class="sourceLineNo">892</span>    Preconditions.checkArgument(proc.getState() == ProcedureState.INITIALIZING);<a name="line.892"></a>
+<span class="sourceLineNo">893</span>    Preconditions.checkArgument(isRunning(), "executor not running");<a name="line.893"></a>
+<span class="sourceLineNo">894</span>    Preconditions.checkArgument(!proc.hasParent(), "unexpected parent", proc);<a name="line.894"></a>
+<span class="sourceLineNo">895</span>    if (this.checkOwnerSet) {<a name="line.895"></a>
+<span class="sourceLineNo">896</span>      Preconditions.checkArgument(proc.hasOwner(), "missing owner");<a name="line.896"></a>
+<span class="sourceLineNo">897</span>    }<a name="line.897"></a>
+<span class="sourceLineNo">898</span>    return proc;<a name="line.898"></a>
+<span class="sourceLineNo">899</span>  }<a name="line.899"></a>
+<span class="sourceLineNo">900</span><a name="line.900"></a>
+<span class="sourceLineNo">901</span>  private long pushProcedure(final Procedure proc) {<a name="line.901"></a>
+<span class="sourceLineNo">902</span>    final long currentProcId = proc.getProcId();<a name="line.902"></a>
+<span class="sourceLineNo">903</span><a name="line.903"></a>
+<span class="sourceLineNo">904</span>    // Update metrics on start of a procedure<a name="line.904"></a>
+<span class="sourceLineNo">905</span>    proc.updateMetricsOnSubmit(getEnvironment());<a name="line.905"></a>
+<span class="sourceLineNo">906</span><a name="line.906"></a>
+<span class="sourceLineNo">907</span>    // Create the rollback stack for the procedure<a name="line.907"></a>
+<span class="sourceLineNo">908</span>    RootProcedureState stack = new RootProcedureState();<a name="line.908"></a>
+<span class="sourceLineNo">909</span>    rollbackStack.put(currentProcId, stack);<a name="line.909"></a>
+<span class="sourceLineNo">910</span><a name="line.9

<TRUNCATED>

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