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From git-site-r...@apache.org
Subject [09/20] hbase-site git commit: Published site at 82d554e3783372cc6b05489452c815b57c06f6cd.
Date Wed, 14 Jun 2017 15:00:00 GMT
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/aa46da47/devapidocs/src-html/org/apache/hadoop/hbase/procedure2/store/wal/ProcedureWALFormatReader.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/procedure2/store/wal/ProcedureWALFormatReader.html b/devapidocs/src-html/org/apache/hadoop/hbase/procedure2/store/wal/ProcedureWALFormatReader.html
index c17d1b1..b1f9eeb 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/procedure2/store/wal/ProcedureWALFormatReader.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/procedure2/store/wal/ProcedureWALFormatReader.html
@@ -52,7 +52,7 @@
 <span class="sourceLineNo">044</span>  private static final Log LOG = LogFactory.getLog(ProcedureWALFormatReader.class);<a name="line.44"></a>
 <span class="sourceLineNo">045</span><a name="line.45"></a>
 <span class="sourceLineNo">046</span>  // ==============================================================================================<a name="line.46"></a>
-<span class="sourceLineNo">047</span>  //  We read the WALs in reverse order. from the newest to the oldest.<a name="line.47"></a>
+<span class="sourceLineNo">047</span>  //  We read the WALs in reverse order from the newest to the oldest.<a name="line.47"></a>
 <span class="sourceLineNo">048</span>  //  We have different entry types:<a name="line.48"></a>
 <span class="sourceLineNo">049</span>  //   - INIT: Procedure submitted by the user (also known as 'root procedure')<a name="line.49"></a>
 <span class="sourceLineNo">050</span>  //   - INSERT: Children added to the procedure &lt;parentId&gt;:[&lt;childId&gt;, ...]<a name="line.50"></a>
@@ -61,777 +61,822 @@
 <span class="sourceLineNo">053</span>  //<a name="line.53"></a>
 <span class="sourceLineNo">054</span>  // In the WAL we can find multiple times the same procedure as UPDATE or INSERT.<a name="line.54"></a>
 <span class="sourceLineNo">055</span>  // We read the WAL from top to bottom, so every time we find an entry of the<a name="line.55"></a>
-<span class="sourceLineNo">056</span>  // same procedure, that will be the "latest" update.<a name="line.56"></a>
-<span class="sourceLineNo">057</span>  //<a name="line.57"></a>
-<span class="sourceLineNo">058</span>  // We keep two in-memory maps:<a name="line.58"></a>
-<span class="sourceLineNo">059</span>  //  - localProcedureMap: is the map containing the entries in the WAL we are processing<a name="line.59"></a>
-<span class="sourceLineNo">060</span>  //  - procedureMap: is the map containing all the procedures we found up to the WAL in process.<a name="line.60"></a>
-<span class="sourceLineNo">061</span>  // localProcedureMap is merged with the procedureMap once we reach the WAL EOF.<a name="line.61"></a>
-<span class="sourceLineNo">062</span>  //<a name="line.62"></a>
-<span class="sourceLineNo">063</span>  // Since we are reading the WALs in reverse order (newest to oldest),<a name="line.63"></a>
-<span class="sourceLineNo">064</span>  // if we find an entry related to a procedure we already have in 'procedureMap' we can discard it.<a name="line.64"></a>
-<span class="sourceLineNo">065</span>  //<a name="line.65"></a>
-<span class="sourceLineNo">066</span>  // The WAL is append-only so the last procedure in the WAL is the one that<a name="line.66"></a>
-<span class="sourceLineNo">067</span>  // was in execution at the time we crashed/closed the server.<a name="line.67"></a>
-<span class="sourceLineNo">068</span>  // given that, the procedure replay order can be inferred by the WAL order.<a name="line.68"></a>
-<span class="sourceLineNo">069</span>  //<a name="line.69"></a>
-<span class="sourceLineNo">070</span>  // Example:<a name="line.70"></a>
-<span class="sourceLineNo">071</span>  //    WAL-2: [A, B, A, C, D]<a name="line.71"></a>
-<span class="sourceLineNo">072</span>  //    WAL-1: [F, G, A, F, B]<a name="line.72"></a>
-<span class="sourceLineNo">073</span>  //    Replay-Order: [D, C, A, B, F, G]<a name="line.73"></a>
-<span class="sourceLineNo">074</span>  //<a name="line.74"></a>
-<span class="sourceLineNo">075</span>  // The "localProcedureMap" keeps a "replayOrder" list. Every time we add the<a name="line.75"></a>
-<span class="sourceLineNo">076</span>  // record to the map that record is moved to the head of the "replayOrder" list.<a name="line.76"></a>
-<span class="sourceLineNo">077</span>  // Using the example above:<a name="line.77"></a>
-<span class="sourceLineNo">078</span>  //    WAL-2 localProcedureMap.replayOrder is [D, C, A, B]<a name="line.78"></a>
-<span class="sourceLineNo">079</span>  //    WAL-1 localProcedureMap.replayOrder is [F, G]<a name="line.79"></a>
-<span class="sourceLineNo">080</span>  //<a name="line.80"></a>
-<span class="sourceLineNo">081</span>  // each time we reach the WAL-EOF, the "replayOrder" list is merged/appended in 'procedureMap'<a name="line.81"></a>
-<span class="sourceLineNo">082</span>  // so using the example above we end up with: [D, C, A, B] + [F, G] as replay order.<a name="line.82"></a>
-<span class="sourceLineNo">083</span>  //<a name="line.83"></a>
-<span class="sourceLineNo">084</span>  //  Fast Start: INIT/INSERT record and StackIDs<a name="line.84"></a>
-<span class="sourceLineNo">085</span>  // ---------------------------------------------<a name="line.85"></a>
-<span class="sourceLineNo">086</span>  // We have two special records, INIT and INSERT, that track the first time<a name="line.86"></a>
-<span class="sourceLineNo">087</span>  // the procedure was added to the WAL. We can use this information to be able<a name="line.87"></a>
-<span class="sourceLineNo">088</span>  // to start procedures before reaching the end of the WAL, or before reading all WALs.<a name="line.88"></a>
-<span class="sourceLineNo">089</span>  // But in some cases, the WAL with that record can be already gone.<a name="line.89"></a>
-<span class="sourceLineNo">090</span>  // As an alternative, we can use the stackIds on each procedure,<a name="line.90"></a>
-<span class="sourceLineNo">091</span>  // to identify when a procedure is ready to start.<a name="line.91"></a>
-<span class="sourceLineNo">092</span>  // If there are gaps in the sum of the stackIds we need to read more WALs.<a name="line.92"></a>
-<span class="sourceLineNo">093</span>  //<a name="line.93"></a>
-<span class="sourceLineNo">094</span>  // Example (all procs child of A):<a name="line.94"></a>
-<span class="sourceLineNo">095</span>  //   WAL-2: [A, B]                   A stackIds = [0, 4], B stackIds = [1, 5]<a name="line.95"></a>
-<span class="sourceLineNo">096</span>  //   WAL-1: [A, B, C, D]<a name="line.96"></a>
-<span class="sourceLineNo">097</span>  //<a name="line.97"></a>
-<span class="sourceLineNo">098</span>  // In the case above we need to read one more WAL to be able to consider<a name="line.98"></a>
-<span class="sourceLineNo">099</span>  // the root procedure A and all children as ready.<a name="line.99"></a>
-<span class="sourceLineNo">100</span>  // ==============================================================================================<a name="line.100"></a>
-<span class="sourceLineNo">101</span>  private final WalProcedureMap localProcedureMap = new WalProcedureMap(1024);<a name="line.101"></a>
-<span class="sourceLineNo">102</span>  private final WalProcedureMap procedureMap = new WalProcedureMap(1024);<a name="line.102"></a>
-<span class="sourceLineNo">103</span><a name="line.103"></a>
-<span class="sourceLineNo">104</span>  private final ProcedureWALFormat.Loader loader;<a name="line.104"></a>
-<span class="sourceLineNo">105</span><a name="line.105"></a>
-<span class="sourceLineNo">106</span>  /**<a name="line.106"></a>
-<span class="sourceLineNo">107</span>   * Global tracker that will be used by the WALProcedureStore after load.<a name="line.107"></a>
-<span class="sourceLineNo">108</span>   * If the last WAL was closed cleanly we already have a full tracker ready to be used.<a name="line.108"></a>
-<span class="sourceLineNo">109</span>   * If the last WAL was truncated (e.g. master killed) the tracker will be empty<a name="line.109"></a>
-<span class="sourceLineNo">110</span>   * and the 'partial' flag will be set. In this case, on WAL replay we are going<a name="line.110"></a>
-<span class="sourceLineNo">111</span>   * to rebuild the tracker.<a name="line.111"></a>
-<span class="sourceLineNo">112</span>   */<a name="line.112"></a>
-<span class="sourceLineNo">113</span>  private final ProcedureStoreTracker tracker;<a name="line.113"></a>
-<span class="sourceLineNo">114</span>  // TODO: private final boolean hasFastStartSupport;<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>   * If tracker for a log file is partial (see {@link ProcedureStoreTracker#partial}), we<a name="line.117"></a>
-<span class="sourceLineNo">118</span>   * re-build the list of procedures updated in that WAL because we need it for log cleaning<a name="line.118"></a>
-<span class="sourceLineNo">119</span>   * purposes. If all procedures updated in a WAL are found to be obsolete, it can be safely deleted.<a name="line.119"></a>
-<span class="sourceLineNo">120</span>   * (see {@link WALProcedureStore#removeInactiveLogs()}).<a name="line.120"></a>
-<span class="sourceLineNo">121</span>   * However, we don't need deleted part of a WAL's tracker for this purpose, so we don't bother<a name="line.121"></a>
-<span class="sourceLineNo">122</span>   * re-building it.<a name="line.122"></a>
-<span class="sourceLineNo">123</span>   */<a name="line.123"></a>
-<span class="sourceLineNo">124</span>  private ProcedureStoreTracker localTracker;<a name="line.124"></a>
-<span class="sourceLineNo">125</span><a name="line.125"></a>
-<span class="sourceLineNo">126</span>  // private long compactionLogId;<a name="line.126"></a>
-<span class="sourceLineNo">127</span>  private long maxProcId = 0;<a name="line.127"></a>
-<span class="sourceLineNo">128</span><a name="line.128"></a>
-<span class="sourceLineNo">129</span>  public ProcedureWALFormatReader(final ProcedureStoreTracker tracker,<a name="line.129"></a>
-<span class="sourceLineNo">130</span>      ProcedureWALFormat.Loader loader) {<a name="line.130"></a>
-<span class="sourceLineNo">131</span>    this.tracker = tracker;<a name="line.131"></a>
-<span class="sourceLineNo">132</span>    this.loader = loader;<a name="line.132"></a>
-<span class="sourceLineNo">133</span>    // we support fast-start only if we have a clean shutdown.<a name="line.133"></a>
-<span class="sourceLineNo">134</span>    // this.hasFastStartSupport = !tracker.isEmpty();<a name="line.134"></a>
-<span class="sourceLineNo">135</span>  }<a name="line.135"></a>
-<span class="sourceLineNo">136</span><a name="line.136"></a>
-<span class="sourceLineNo">137</span>  public void read(final ProcedureWALFile log) throws IOException {<a name="line.137"></a>
-<span class="sourceLineNo">138</span>    localTracker = log.getTracker().isPartial() ? log.getTracker() : null;<a name="line.138"></a>
-<span class="sourceLineNo">139</span>    if (localTracker != null) {<a name="line.139"></a>
-<span class="sourceLineNo">140</span>      LOG.info("Rebuilding tracker for " + log);<a name="line.140"></a>
-<span class="sourceLineNo">141</span>    }<a name="line.141"></a>
-<span class="sourceLineNo">142</span><a name="line.142"></a>
-<span class="sourceLineNo">143</span>    FSDataInputStream stream = log.getStream();<a name="line.143"></a>
-<span class="sourceLineNo">144</span>    try {<a name="line.144"></a>
-<span class="sourceLineNo">145</span>      boolean hasMore = true;<a name="line.145"></a>
-<span class="sourceLineNo">146</span>      while (hasMore) {<a name="line.146"></a>
-<span class="sourceLineNo">147</span>        ProcedureWALEntry entry = ProcedureWALFormat.readEntry(stream);<a name="line.147"></a>
-<span class="sourceLineNo">148</span>        if (entry == null) {<a name="line.148"></a>
-<span class="sourceLineNo">149</span>          LOG.warn("Nothing left to decode. Exiting with missing EOF, log=" + log);<a name="line.149"></a>
-<span class="sourceLineNo">150</span>          break;<a name="line.150"></a>
-<span class="sourceLineNo">151</span>        }<a name="line.151"></a>
-<span class="sourceLineNo">152</span>        switch (entry.getType()) {<a name="line.152"></a>
-<span class="sourceLineNo">153</span>          case PROCEDURE_WAL_INIT:<a name="line.153"></a>
-<span class="sourceLineNo">154</span>            readInitEntry(entry);<a name="line.154"></a>
-<span class="sourceLineNo">155</span>            break;<a name="line.155"></a>
-<span class="sourceLineNo">156</span>          case PROCEDURE_WAL_INSERT:<a name="line.156"></a>
-<span class="sourceLineNo">157</span>            readInsertEntry(entry);<a name="line.157"></a>
-<span class="sourceLineNo">158</span>            break;<a name="line.158"></a>
-<span class="sourceLineNo">159</span>          case PROCEDURE_WAL_UPDATE:<a name="line.159"></a>
-<span class="sourceLineNo">160</span>          case PROCEDURE_WAL_COMPACT:<a name="line.160"></a>
-<span class="sourceLineNo">161</span>            readUpdateEntry(entry);<a name="line.161"></a>
-<span class="sourceLineNo">162</span>            break;<a name="line.162"></a>
-<span class="sourceLineNo">163</span>          case PROCEDURE_WAL_DELETE:<a name="line.163"></a>
-<span class="sourceLineNo">164</span>            readDeleteEntry(entry);<a name="line.164"></a>
-<span class="sourceLineNo">165</span>            break;<a name="line.165"></a>
-<span class="sourceLineNo">166</span>          case PROCEDURE_WAL_EOF:<a name="line.166"></a>
-<span class="sourceLineNo">167</span>            hasMore = false;<a name="line.167"></a>
-<span class="sourceLineNo">168</span>            break;<a name="line.168"></a>
-<span class="sourceLineNo">169</span>          default:<a name="line.169"></a>
-<span class="sourceLineNo">170</span>            throw new CorruptedWALProcedureStoreException("Invalid entry: " + entry);<a name="line.170"></a>
-<span class="sourceLineNo">171</span>        }<a name="line.171"></a>
-<span class="sourceLineNo">172</span>      }<a name="line.172"></a>
-<span class="sourceLineNo">173</span>    } catch (InvalidProtocolBufferException e) {<a name="line.173"></a>
-<span class="sourceLineNo">174</span>      LOG.error("While reading procedure from " + log, e);<a name="line.174"></a>
-<span class="sourceLineNo">175</span>      loader.markCorruptedWAL(log, e);<a name="line.175"></a>
-<span class="sourceLineNo">176</span>    }<a name="line.176"></a>
-<span class="sourceLineNo">177</span><a name="line.177"></a>
-<span class="sourceLineNo">178</span>    if (localTracker != null) {<a name="line.178"></a>
-<span class="sourceLineNo">179</span>      localTracker.setPartialFlag(false);<a name="line.179"></a>
-<span class="sourceLineNo">180</span>    }<a name="line.180"></a>
-<span class="sourceLineNo">181</span>    if (!localProcedureMap.isEmpty()) {<a name="line.181"></a>
-<span class="sourceLineNo">182</span>      log.setProcIds(localProcedureMap.getMinProcId(), localProcedureMap.getMaxProcId());<a name="line.182"></a>
-<span class="sourceLineNo">183</span>      procedureMap.mergeTail(localProcedureMap);<a name="line.183"></a>
-<span class="sourceLineNo">184</span><a name="line.184"></a>
-<span class="sourceLineNo">185</span>      //if (hasFastStartSupport) {<a name="line.185"></a>
-<span class="sourceLineNo">186</span>        // TODO: Some procedure may be already runnables (see readInitEntry())<a name="line.186"></a>
-<span class="sourceLineNo">187</span>        //       (we can also check the "update map" in the log trackers)<a name="line.187"></a>
-<span class="sourceLineNo">188</span>        // --------------------------------------------------<a name="line.188"></a>
-<span class="sourceLineNo">189</span>        //EntryIterator iter = procedureMap.fetchReady();<a name="line.189"></a>
-<span class="sourceLineNo">190</span>        //if (iter != null) loader.load(iter);<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>  }<a name="line.194"></a>
-<span class="sourceLineNo">195</span><a name="line.195"></a>
-<span class="sourceLineNo">196</span>  public void finish() throws IOException {<a name="line.196"></a>
-<span class="sourceLineNo">197</span>    // notify the loader about the max proc ID<a name="line.197"></a>
-<span class="sourceLineNo">198</span>    loader.setMaxProcId(maxProcId);<a name="line.198"></a>
-<span class="sourceLineNo">199</span><a name="line.199"></a>
-<span class="sourceLineNo">200</span>    // fetch the procedure ready to run.<a name="line.200"></a>
-<span class="sourceLineNo">201</span>    ProcedureIterator procIter = procedureMap.fetchReady();<a name="line.201"></a>
-<span class="sourceLineNo">202</span>    if (procIter != null) loader.load(procIter);<a name="line.202"></a>
-<span class="sourceLineNo">203</span><a name="line.203"></a>
-<span class="sourceLineNo">204</span>    // remaining procedures have missing link or dependencies<a name="line.204"></a>
-<span class="sourceLineNo">205</span>    // consider them as corrupted, manual fix is probably required.<a name="line.205"></a>
-<span class="sourceLineNo">206</span>    procIter = procedureMap.fetchAll();<a name="line.206"></a>
-<span class="sourceLineNo">207</span>    if (procIter != null) loader.handleCorrupted(procIter);<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>  private void loadProcedure(final ProcedureWALEntry entry, final ProcedureProtos.Procedure proc) {<a name="line.210"></a>
-<span class="sourceLineNo">211</span>    maxProcId = Math.max(maxProcId, proc.getProcId());<a name="line.211"></a>
-<span class="sourceLineNo">212</span>    if (isRequired(proc.getProcId())) {<a name="line.212"></a>
-<span class="sourceLineNo">213</span>      if (LOG.isTraceEnabled()) {<a name="line.213"></a>
-<span class="sourceLineNo">214</span>        LOG.trace("Read " + entry.getType() + " entry " + proc.getProcId());<a name="line.214"></a>
-<span class="sourceLineNo">215</span>      }<a name="line.215"></a>
-<span class="sourceLineNo">216</span>      localProcedureMap.add(proc);<a name="line.216"></a>
-<span class="sourceLineNo">217</span>      if (tracker.isPartial()) {<a name="line.217"></a>
-<span class="sourceLineNo">218</span>        tracker.insert(proc.getProcId());<a name="line.218"></a>
-<span class="sourceLineNo">219</span>      }<a name="line.219"></a>
-<span class="sourceLineNo">220</span>    }<a name="line.220"></a>
-<span class="sourceLineNo">221</span>    if (localTracker != null) {<a name="line.221"></a>
-<span class="sourceLineNo">222</span>      localTracker.insert(proc.getProcId());<a name="line.222"></a>
-<span class="sourceLineNo">223</span>    }<a name="line.223"></a>
-<span class="sourceLineNo">224</span>  }<a name="line.224"></a>
-<span class="sourceLineNo">225</span><a name="line.225"></a>
-<span class="sourceLineNo">226</span>  private void readInitEntry(final ProcedureWALEntry entry)<a name="line.226"></a>
-<span class="sourceLineNo">227</span>      throws IOException {<a name="line.227"></a>
-<span class="sourceLineNo">228</span>    assert entry.getProcedureCount() == 1 : "Expected only one procedure";<a name="line.228"></a>
-<span class="sourceLineNo">229</span>    loadProcedure(entry, entry.getProcedure(0));<a name="line.229"></a>
-<span class="sourceLineNo">230</span>  }<a name="line.230"></a>
-<span class="sourceLineNo">231</span><a name="line.231"></a>
-<span class="sourceLineNo">232</span>  private void readInsertEntry(final ProcedureWALEntry entry) throws IOException {<a name="line.232"></a>
-<span class="sourceLineNo">233</span>    assert entry.getProcedureCount() &gt;= 1 : "Expected one or more procedures";<a name="line.233"></a>
-<span class="sourceLineNo">234</span>    loadProcedure(entry, entry.getProcedure(0));<a name="line.234"></a>
-<span class="sourceLineNo">235</span>    for (int i = 1; i &lt; entry.getProcedureCount(); ++i) {<a name="line.235"></a>
-<span class="sourceLineNo">236</span>      loadProcedure(entry, entry.getProcedure(i));<a name="line.236"></a>
-<span class="sourceLineNo">237</span>    }<a name="line.237"></a>
-<span class="sourceLineNo">238</span>  }<a name="line.238"></a>
-<span class="sourceLineNo">239</span><a name="line.239"></a>
-<span class="sourceLineNo">240</span>  private void readUpdateEntry(final ProcedureWALEntry entry) throws IOException {<a name="line.240"></a>
-<span class="sourceLineNo">241</span>    assert entry.getProcedureCount() == 1 : "Expected only one procedure";<a name="line.241"></a>
-<span class="sourceLineNo">242</span>    loadProcedure(entry, entry.getProcedure(0));<a name="line.242"></a>
-<span class="sourceLineNo">243</span>  }<a name="line.243"></a>
-<span class="sourceLineNo">244</span><a name="line.244"></a>
-<span class="sourceLineNo">245</span>  private void readDeleteEntry(final ProcedureWALEntry entry) throws IOException {<a name="line.245"></a>
-<span class="sourceLineNo">246</span>    assert entry.hasProcId() : "expected ProcID";<a name="line.246"></a>
-<span class="sourceLineNo">247</span><a name="line.247"></a>
-<span class="sourceLineNo">248</span>    if (entry.getChildIdCount() &gt; 0) {<a name="line.248"></a>
-<span class="sourceLineNo">249</span>      assert entry.getProcedureCount() == 1 : "Expected only one procedure";<a name="line.249"></a>
-<span class="sourceLineNo">250</span><a name="line.250"></a>
-<span class="sourceLineNo">251</span>      // update the parent procedure<a name="line.251"></a>
-<span class="sourceLineNo">252</span>      loadProcedure(entry, entry.getProcedure(0));<a name="line.252"></a>
-<span class="sourceLineNo">253</span><a name="line.253"></a>
-<span class="sourceLineNo">254</span>      // remove the child procedures of entry.getProcId()<a name="line.254"></a>
-<span class="sourceLineNo">255</span>      for (int i = 0, count = entry.getChildIdCount(); i &lt; count; ++i) {<a name="line.255"></a>
-<span class="sourceLineNo">256</span>        deleteEntry(entry.getChildId(i));<a name="line.256"></a>
-<span class="sourceLineNo">257</span>      }<a name="line.257"></a>
-<span class="sourceLineNo">258</span>    } else {<a name="line.258"></a>
-<span class="sourceLineNo">259</span>      assert entry.getProcedureCount() == 0 : "Expected no procedures";<a name="line.259"></a>
-<span class="sourceLineNo">260</span><a name="line.260"></a>
-<span class="sourceLineNo">261</span>      // delete the procedure<a name="line.261"></a>
-<span class="sourceLineNo">262</span>      deleteEntry(entry.getProcId());<a name="line.262"></a>
-<span class="sourceLineNo">263</span>    }<a name="line.263"></a>
-<span class="sourceLineNo">264</span>  }<a name="line.264"></a>
-<span class="sourceLineNo">265</span><a name="line.265"></a>
-<span class="sourceLineNo">266</span>  private void deleteEntry(final long procId) {<a name="line.266"></a>
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-<span class="sourceLineNo">290</span>  // ==========================================================================<a name="line.290"></a>
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-<span class="sourceLineNo">293</span>  //                      _______________________________________________<a name="line.293"></a>
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-<span class="sourceLineNo">298</span>  //  We also have a lazy grouping by "root procedure", and a list of<a name="line.298"></a>
-<span class="sourceLineNo">299</span>  //  unlinked procedures. If after reading all the WALs we have unlinked<a name="line.299"></a>
-<span class="sourceLineNo">300</span>  //  procedures it means that we had a missing WAL or a corruption.<a name="line.300"></a>
-<span class="sourceLineNo">301</span>  //      rootHead = A &lt;-&gt; D &lt;-&gt; G<a name="line.301"></a>
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-<span class="sourceLineNo">303</span>  //                 C<a name="line.303"></a>
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-<span class="sourceLineNo">309</span>    // child head<a name="line.309"></a>
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-<span class="sourceLineNo">341</span>      return false;<a name="line.341"></a>
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-<span class="sourceLineNo">367</span>  }<a name="line.367"></a>
+<span class="sourceLineNo">056</span>  // same procedure, that will be the "latest" update (Caveat: with multiple threads writing<a name="line.56"></a>
+<span class="sourceLineNo">057</span>  // the store, this assumption does not hold).<a name="line.57"></a>
+<span class="sourceLineNo">058</span>  //<a name="line.58"></a>
+<span class="sourceLineNo">059</span>  // We keep two in-memory maps:<a name="line.59"></a>
+<span class="sourceLineNo">060</span>  //  - localProcedureMap: is the map containing the entries in the WAL we are processing<a name="line.60"></a>
+<span class="sourceLineNo">061</span>  //  - procedureMap: is the map containing all the procedures we found up to the WAL in process.<a name="line.61"></a>
+<span class="sourceLineNo">062</span>  // localProcedureMap is merged with the procedureMap once we reach the WAL EOF.<a name="line.62"></a>
+<span class="sourceLineNo">063</span>  //<a name="line.63"></a>
+<span class="sourceLineNo">064</span>  // Since we are reading the WALs in reverse order (newest to oldest),<a name="line.64"></a>
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+<span class="sourceLineNo">066</span>  //<a name="line.66"></a>
+<span class="sourceLineNo">067</span>  // The WAL is append-only so the last procedure in the WAL is the one that<a name="line.67"></a>
+<span class="sourceLineNo">068</span>  // was in execution at the time we crashed/closed the server.<a name="line.68"></a>
+<span class="sourceLineNo">069</span>  // Given that, the procedure replay order can be inferred by the WAL order.<a name="line.69"></a>
+<span class="sourceLineNo">070</span>  //<a name="line.70"></a>
+<span class="sourceLineNo">071</span>  // Example:<a name="line.71"></a>
+<span class="sourceLineNo">072</span>  //    WAL-2: [A, B, A, C, D]<a name="line.72"></a>
+<span class="sourceLineNo">073</span>  //    WAL-1: [F, G, A, F, B]<a name="line.73"></a>
+<span class="sourceLineNo">074</span>  //    Replay-Order: [D, C, A, B, F, G]<a name="line.74"></a>
+<span class="sourceLineNo">075</span>  //<a name="line.75"></a>
+<span class="sourceLineNo">076</span>  // The "localProcedureMap" keeps a "replayOrder" list. Every time we add the<a name="line.76"></a>
+<span class="sourceLineNo">077</span>  // record to the map that record is moved to the head of the "replayOrder" list.<a name="line.77"></a>
+<span class="sourceLineNo">078</span>  // Using the example above:<a name="line.78"></a>
+<span class="sourceLineNo">079</span>  //    WAL-2 localProcedureMap.replayOrder is [D, C, A, B]<a name="line.79"></a>
+<span class="sourceLineNo">080</span>  //    WAL-1 localProcedureMap.replayOrder is [F, G]<a name="line.80"></a>
+<span class="sourceLineNo">081</span>  //<a name="line.81"></a>
+<span class="sourceLineNo">082</span>  // Each time we reach the WAL-EOF, the "replayOrder" list is merged/appended in 'procedureMap'<a name="line.82"></a>
+<span class="sourceLineNo">083</span>  // so using the example above we end up with: [D, C, A, B] + [F, G] as replay order.<a name="line.83"></a>
+<span class="sourceLineNo">084</span>  //<a name="line.84"></a>
+<span class="sourceLineNo">085</span>  //  Fast Start: INIT/INSERT record and StackIDs<a name="line.85"></a>
+<span class="sourceLineNo">086</span>  // ---------------------------------------------<a name="line.86"></a>
+<span class="sourceLineNo">087</span>  // We have two special records, INIT and INSERT, that track the first time<a name="line.87"></a>
+<span class="sourceLineNo">088</span>  // the procedure was added to the WAL. We can use this information to be able<a name="line.88"></a>
+<span class="sourceLineNo">089</span>  // to start procedures before reaching the end of the WAL, or before reading all WALs.<a name="line.89"></a>
+<span class="sourceLineNo">090</span>  // But in some cases, the WAL with that record can be already gone.<a name="line.90"></a>
+<span class="sourceLineNo">091</span>  // As an alternative, we can use the stackIds on each procedure,<a name="line.91"></a>
+<span class="sourceLineNo">092</span>  // to identify when a procedure is ready to start.<a name="line.92"></a>
+<span class="sourceLineNo">093</span>  // If there are gaps in the sum of the stackIds we need to read more WALs.<a name="line.93"></a>
+<span class="sourceLineNo">094</span>  //<a name="line.94"></a>
+<span class="sourceLineNo">095</span>  // Example (all procs child of A):<a name="line.95"></a>
+<span class="sourceLineNo">096</span>  //   WAL-2: [A, B]                   A stackIds = [0, 4], B stackIds = [1, 5]<a name="line.96"></a>
+<span class="sourceLineNo">097</span>  //   WAL-1: [A, B, C, D]<a name="line.97"></a>
+<span class="sourceLineNo">098</span>  //<a name="line.98"></a>
+<span class="sourceLineNo">099</span>  // In the case above we need to read one more WAL to be able to consider<a name="line.99"></a>
+<span class="sourceLineNo">100</span>  // the root procedure A and all children as ready.<a name="line.100"></a>
+<span class="sourceLineNo">101</span>  // ==============================================================================================<a name="line.101"></a>
+<span class="sourceLineNo">102</span>  private final WalProcedureMap localProcedureMap = new WalProcedureMap(1024);<a name="line.102"></a>
+<span class="sourceLineNo">103</span>  private final WalProcedureMap procedureMap = new WalProcedureMap(1024);<a name="line.103"></a>
+<span class="sourceLineNo">104</span><a name="line.104"></a>
+<span class="sourceLineNo">105</span>  private final ProcedureWALFormat.Loader loader;<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>   * Global tracker that will be used by the WALProcedureStore after load.<a name="line.108"></a>
+<span class="sourceLineNo">109</span>   * If the last WAL was closed cleanly we already have a full tracker ready to be used.<a name="line.109"></a>
+<span class="sourceLineNo">110</span>   * If the last WAL was truncated (e.g. master killed) the tracker will be empty<a name="line.110"></a>
+<span class="sourceLineNo">111</span>   * and the 'partial' flag will be set. In this case, on WAL replay we are going<a name="line.111"></a>
+<span class="sourceLineNo">112</span>   * to rebuild the tracker.<a name="line.112"></a>
+<span class="sourceLineNo">113</span>   */<a name="line.113"></a>
+<span class="sourceLineNo">114</span>  private final ProcedureStoreTracker tracker;<a name="line.114"></a>
+<span class="sourceLineNo">115</span>  // TODO: private final boolean hasFastStartSupport;<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>   * If tracker for a log file is partial (see {@link ProcedureStoreTracker#partial}), we<a name="line.118"></a>
+<span class="sourceLineNo">119</span>   * re-build the list of procedures updated in that WAL because we need it for log cleaning<a name="line.119"></a>
+<span class="sourceLineNo">120</span>   * purposes. If all procedures updated in a WAL are found to be obsolete, it can be safely deleted.<a name="line.120"></a>
+<span class="sourceLineNo">121</span>   * (see {@link WALProcedureStore#removeInactiveLogs()}).<a name="line.121"></a>
+<span class="sourceLineNo">122</span>   * However, we don't need deleted part of a WAL's tracker for this purpose, so we don't bother<a name="line.122"></a>
+<span class="sourceLineNo">123</span>   * re-building it.<a name="line.123"></a>
+<span class="sourceLineNo">124</span>   */<a name="line.124"></a>
+<span class="sourceLineNo">125</span>  private ProcedureStoreTracker localTracker;<a name="line.125"></a>
+<span class="sourceLineNo">126</span><a name="line.126"></a>
+<span class="sourceLineNo">127</span>  // private long compactionLogId;<a name="line.127"></a>
+<span class="sourceLineNo">128</span>  private long maxProcId = 0;<a name="line.128"></a>
+<span class="sourceLineNo">129</span><a name="line.129"></a>
+<span class="sourceLineNo">130</span>  public ProcedureWALFormatReader(final ProcedureStoreTracker tracker,<a name="line.130"></a>
+<span class="sourceLineNo">131</span>      ProcedureWALFormat.Loader loader) {<a name="line.131"></a>
+<span class="sourceLineNo">132</span>    this.tracker = tracker;<a name="line.132"></a>
+<span class="sourceLineNo">133</span>    this.loader = loader;<a name="line.133"></a>
+<span class="sourceLineNo">134</span>    // we support fast-start only if we have a clean shutdown.<a name="line.134"></a>
+<span class="sourceLineNo">135</span>    // this.hasFastStartSupport = !tracker.isEmpty();<a name="line.135"></a>
+<span class="sourceLineNo">136</span>  }<a name="line.136"></a>
+<span class="sourceLineNo">137</span><a name="line.137"></a>
+<span class="sourceLineNo">138</span>  public void read(final ProcedureWALFile log) throws IOException {<a name="line.138"></a>
+<span class="sourceLineNo">139</span>    localTracker = log.getTracker().isPartial() ? log.getTracker() : null;<a name="line.139"></a>
+<span class="sourceLineNo">140</span>    if (localTracker != null) {<a name="line.140"></a>
+<span class="sourceLineNo">141</span>      LOG.info("Rebuilding tracker for " + log);<a name="line.141"></a>
+<span class="sourceLineNo">142</span>    }<a name="line.142"></a>
+<span class="sourceLineNo">143</span><a name="line.143"></a>
+<span class="sourceLineNo">144</span>    FSDataInputStream stream = log.getStream();<a name="line.144"></a>
+<span class="sourceLineNo">145</span>    try {<a name="line.145"></a>
+<span class="sourceLineNo">146</span>      boolean hasMore = true;<a name="line.146"></a>
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+<span class="sourceLineNo">148</span>        ProcedureWALEntry entry = ProcedureWALFormat.readEntry(stream);<a name="line.148"></a>
+<span class="sourceLineNo">149</span>        if (entry == null) {<a name="line.149"></a>
+<span class="sourceLineNo">150</span>          LOG.warn("Nothing left to decode. Exiting with missing EOF, log=" + log);<a name="line.150"></a>
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+<span class="sourceLineNo">152</span>        }<a name="line.152"></a>
+<span class="sourceLineNo">153</span>        switch (entry.getType()) {<a name="line.153"></a>
+<span class="sourceLineNo">154</span>          case PROCEDURE_WAL_INIT:<a name="line.154"></a>
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+<span class="sourceLineNo">156</span>            break;<a name="line.156"></a>
+<span class="sourceLineNo">157</span>          case PROCEDURE_WAL_INSERT:<a name="line.157"></a>
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+<span class="sourceLineNo">160</span>          case PROCEDURE_WAL_UPDATE:<a name="line.160"></a>
+<span class="sourceLineNo">161</span>          case PROCEDURE_WAL_COMPACT:<a name="line.161"></a>
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+<span class="sourceLineNo">164</span>          case PROCEDURE_WAL_DELETE:<a name="line.164"></a>
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+<span class="sourceLineNo">170</span>          default:<a name="line.170"></a>
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+<span class="sourceLineNo">173</span>      }<a name="line.173"></a>
+<span class="sourceLineNo">174</span>    } catch (InvalidProtocolBufferException e) {<a name="line.174"></a>
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+<span class="sourceLineNo">176</span>      loader.markCorruptedWAL(log, e);<a name="line.176"></a>
+<span class="sourceLineNo">177</span>    }<a name="line.177"></a>
+<span class="sourceLineNo">178</span><a name="line.178"></a>
+<span class="sourceLineNo">179</span>    if (localTracker != null) {<a name="line.179"></a>
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+<span class="sourceLineNo">181</span>    }<a name="line.181"></a>
+<span class="sourceLineNo">182</span>    if (!localProcedureMap.isEmpty()) {<a name="line.182"></a>
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+<span class="sourceLineNo">184</span>      procedureMap.mergeTail(localProcedureMap);<a name="line.184"></a>
+<span class="sourceLineNo">185</span><a name="line.185"></a>
+<span class="sourceLineNo">186</span>      //if (hasFastStartSupport) {<a name="line.186"></a>
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+<span class="sourceLineNo">192</span>      // --------------------------------------------------<a name="line.192"></a>
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+<span class="sourceLineNo">200</span><a name="line.200"></a>
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+<span class="sourceLineNo">204</span><a name="line.204"></a>
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+<span class="sourceLineNo">210</span><a name="line.210"></a>
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+<span class="sourceLineNo">226</span><a name="line.226"></a>
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+<span class="sourceLineNo">266</span><a name="line.266"></a>
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+<span class="sourceLineNo">282</span><a name="line.282"></a>
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+<span class="sourceLineNo">290</span><a name="line.290"></a>
+<span class="sourceLineNo">291</span>  // ==========================================================================<a name="line.291"></a>
+<span class="sourceLineNo">292</span>  //  We keep an in-memory map of the procedures sorted by replay order.<a name="line.292"></a>
+<span class="sourceLineNo">293</span>  //  (see the details in the beginning of the file)<a name="line.293"></a>
+<span class="sourceLineNo">294</span>  //                      _______________________________________________<a name="line.294"></a>
+<span class="sourceLineNo">295</span>  //      procedureMap = | A |   | E |   | C |   |   |   |   | G |   |   |<a name="line.295"></a>
+<span class="sourceLineNo">296</span>  //                       D               B<a name="line.296"></a>
+<span class="sourceLineNo">297</span>  //      replayOrderHead = C &lt;-&gt; B &lt;-&gt; E &lt;-&gt; D &lt;-&gt; A &lt;-&gt; G<a name="line.297"></a>
+<span class="sourceLineNo">298</span>  //<a name="line.298"></a>
+<span class="sourceLineNo">299</span>  //  We also have a lazy grouping by "root procedure", and a list of<a name="line.299"></a>
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+<span class="sourceLineNo">304</span>  //                 C<a name="line.304"></a>
+<span class="sourceLineNo">305</span>  //      unlinkFromLinkList = None<a name="line.305"></a>
+<span class="sourceLineNo">306</span>  // ==========================================================================<a name="line.306"></a>
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-<span class="sourceLineNo">408</span>    public ProcedureInfo nextAsProcedureInfo() {<a name="line.408"></a>
-<span class="sourceLineNo">409</span>      try {<a name="line.409"></a>
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-<span class="sourceLineNo">418</span>    // procedure hash table<a name="line.418"></a>
-<span class="sourceLineNo">419</span>    private Entry[] procedureMap;<a name="line.419"></a>
+<span class="sourceLineNo">408</span>    public void skipNext() {<a name="line.408"></a>
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+<span class="sourceLineNo">410</span>    }<a name="line.410"></a>
+<span class="sourceLineNo">411</span><a name="line.411"></a>
+<span class="sourceLineNo">412</span>    @Override<a name="line.412"></a>
+<span class="sourceLineNo">413</span>    public Procedure nextAsProcedure() throws IOException {<a name="line.413"></a>
+<span class="sourceLineNo">414</span>      try {<a name="line.414"></a>
+<span class="sourceLineNo">415</span>        return current.convert();<a name="line.415"></a>
+<span class="sourceLineNo">416</span>      } finally {<a name="line.416"></a>
+<span class="sourceLineNo">417</span>        current = current.replayNext;<a name="line.417"></a>
+<span class="sourceLineNo">418</span>      }<a name="line.418"></a>
+<span class="sourceLineNo">419</span>    }<a name="line.419"></a>
 <span class="sourceLineNo">420</span><a name="line.420"></a>
-<span class="sourceLineNo">421</span>    // replay-order double-linked-list<a name="line.421"></a>
-<span class="sourceLineNo">422</span>    private Entry replayOrderHead;<a name="line.422"></a>
-<span class="sourceLineNo">423</span>    private Entry replayOrderTail;<a name="line.423"></a>
-<span class="sourceLineNo">424</span><a name="line.424"></a>
-<span class="sourceLineNo">425</span>    // root linked-list<a name="line.425"></a>
-<span class="sourceLineNo">426</span>    private Entry rootHead;<a name="line.426"></a>
-<span class="sourceLineNo">427</span><a name="line.427"></a>
-<span class="sourceLineNo">428</span>    // pending unlinked children (root not present yet)<a name="line.428"></a>
-<span class="sourceLineNo">429</span>    private Entry childUnlinkedHead;<a name="line.429"></a>
+<span class="sourceLineNo">421</span>    @Override<a name="line.421"></a>
+<span class="sourceLineNo">422</span>    public ProcedureInfo nextAsProcedureInfo() {<a name="line.422"></a>
+<span class="sourceLineNo">423</span>      try {<a name="line.423"></a>
+<span class="sourceLineNo">424</span>        return current.convertToInfo();<a name="line.424"></a>
+<span class="sourceLineNo">425</span>      } finally {<a name="line.425"></a>
+<span class="sourceLineNo">426</span>        current = current.replayNext;<a name="line.426"></a>
+<span class="sourceLineNo">427</span>      }<a name="line.427"></a>
+<span class="sourceLineNo">428</span>    }<a name="line.428"></a>
+<span class="sourceLineNo">429</span>  }<a name="line.429"></a>
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-<span class="sourceLineNo">431</span>    // Track ProcId range<a name="line.431"></a>
-<span class="sourceLineNo">432</span>    private long minProcId = Long.MAX_VALUE;<a name="line.432"></a>
-<span class="sourceLineNo">433</span>    private long maxProcId = Long.MIN_VALUE;<a name="line.433"></a>
+<span class="sourceLineNo">431</span>  private static class WalProcedureMap {<a name="line.431"></a>
+<span class="sourceLineNo">432</span>    // procedure hash table<a name="line.432"></a>
+<span class="sourceLineNo">433</span>    private Entry[] procedureMap;<a name="line.433"></a>
 <span class="sourceLineNo">434</span><a name="line.434"></a>
-<span class="sourceLineNo">435</span>    public WalProcedureMap(int size) {<a name="line.435"></a>
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-<span class="sourceLineNo">437</span>      replayOrderHead = null;<a name="line.437"></a>
-<span class="sourceLineNo">438</span>      replayOrderTail = null;<a name="line.438"></a>
-<span class="sourceLineNo">439</span>      rootHead = null;<a name="line.439"></a>
-<span class="sourceLineNo">440</span>      childUnlinkedHead = null;<a name="line.440"></a>
-<span class="sourceLineNo">441</span>    }<a name="line.441"></a>
-<span class="sourceLineNo">442</span><a name="line.442"></a>
-<span class="sourceLineNo">443</span>    public void add(ProcedureProtos.Procedure procProto) {<a name="line.443"></a>
-<span class="sourceLineNo">444</span>      trackProcIds(procProto.getProcId());<a name="line.444"></a>
-<span class="sourceLineNo">445</span>      Entry entry = addToMap(procProto.getProcId(), procProto.hasParentId());<a name="line.445"></a>
-<span class="sourceLineNo">446</span>      boolean isNew = entry.proto == null;<a name="line.446"></a>
-<span class="sourceLineNo">447</span>      entry.proto = procProto;<a name="line.447"></a>
-<span class="sourceLineNo">448</span>      addToReplayList(entry);<a name="line.448"></a>
-<span class="sourceLineNo">449</span><a name="line.449"></a>
-<span class="sourceLineNo">450</span>      if (isNew) {<a name="line.450"></a>
-<span class="sourceLineNo">451</span>        if (procProto.hasParentId()) {<a name="line.451"></a>
-<span class="sourceLineNo">452</span>          childUnlinkedHead = addToLinkList(entry, childUnlinkedHead);<a name="line.452"></a>
-<span class="sourceLineNo">453</span>        } else {<a name="line.453"></a>
-<span class="sourceLineNo">454</span>          rootHead = addToLinkList(entry, rootHead);<a name="line.454"></a>
-<span class="sourceLineNo">455</span>        }<a name="line.455"></a>
-<span class="sourceLineNo">456</span>      }<a name="line.456"></a>
-<span class="sourceLineNo">457</span>    }<a name="line.457"></a>
-<span class="sourceLineNo">458</span><a name="line.458"></a>
-<span class="sourceLineNo">459</span>    public boolean remove(long procId) {<a name="line.459"></a>
-<span class="sourceLineNo">460</span>      trackProcIds(procId);<a name="line.460"></a>
-<span class="sourceLineNo">461</span>      Entry entry = removeFromMap(procId);<a name="line.461"></a>
-<span class="sourceLineNo">462</span>      if (entry != null) {<a name="line.462"></a>
-<span class="sourceLineNo">463</span>        unlinkFromReplayList(entry);<a name="line.463"></a>
-<span class="sourceLineNo">464</span>        unlinkFromLinkList(entry);<a name="line.464"></a>
-<span class="sourceLineNo">465</span>        return true;<a name="line.465"></a>
-<span class="sourceLineNo">466</span>      }<a name="line.466"></a>
-<span class="sourceLineNo">467</span>      return false;<a name="line.467"></a>
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-<span class="sourceLineNo">469</span><a name="line.469"></a>
-<span class="sourceLineNo">470</span>    private void trackProcIds(long procId) {<a name="line.470"></a>
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-<span class="sourceLineNo">472</span>      maxProcId = Math.max(maxProcId, procId);<a name="line.472"></a>
-<span class="sourceLineNo">473</span>    }<a name="line.473"></a>
-<span class="sourceLineNo">474</span><a name="line.474"></a>
-<span class="sourceLineNo">475</span>    public long getMinProcId() {<a name="line.475"></a>
-<span class="sourceLineNo">476</span>      return minProcId;<a name="line.476"></a>
+<span class="sourceLineNo">435</span>    // replay-order double-linked-list<a name="line.435"></a>
+<span class="sourceLineNo">436</span>    private Entry replayOrderHead;<a name="line.436"></a>
+<span class="sourceLineNo">437</span>    private Entry replayOrderTail;<a name="line.437"></a>
+<span class="sourceLineNo">438</span><a name="line.438"></a>
+<span class="sourceLineNo">439</span>    // root linked-list<a name="line.439"></a>
+<span class="sourceLineNo">440</span>    private Entry rootHead;<a name="line.440"></a>
+<span class="sourceLineNo">441</span><a name="line.441"></a>
+<span class="sourceLineNo">442</span>    // pending unlinked children (root not present yet)<a name="line.442"></a>
+<span class="sourceLineNo">443</span>    private Entry childUnlinkedHead;<a name="line.443"></a>
+<span class="sourceLineNo">444</span><a name="line.444"></a>
+<span class="sourceLineNo">445</span>    // Track ProcId range<a name="line.445"></a>
+<span class="sourceLineNo">446</span>    private long minProcId = Long.MAX_VALUE;<a name="line.446"></a>
+<span class="sourceLineNo">447</span>    private long maxProcId = Long.MIN_VALUE;<a name="line.447"></a>
+<span class="sourceLineNo">448</span><a name="line.448"></a>
+<span class="sourceLineNo">449</span>    public WalProcedureMap(int size) {<a name="line.449"></a>
+<span class="sourceLineNo">450</span>      procedureMap = new Entry[size];<a name="line.450"></a>
+<span class="sourceLineNo">451</span>      replayOrderHead = null;<a name="line.451"></a>
+<span class="sourceLineNo">452</span>      replayOrderTail = null;<a name="line.452"></a>
+<span class="sourceLineNo">453</span>      rootHead = null;<a name="line.453"></a>
+<span class="sourceLineNo">454</span>      childUnlinkedHead = null;<a name="line.454"></a>
+<span class="sourceLineNo">455</span>    }<a name="line.455"></a>
+<span class="sourceLineNo">456</span><a name="line.456"></a>
+<span class="sourceLineNo">457</span>    public void add(ProcedureProtos.Procedure procProto) {<a name="line.457"></a>
+<span class="sourceLineNo">458</span>      trackProcIds(procProto.getProcId());<a name="line.458"></a>
+<span class="sourceLineNo">459</span>      Entry entry = addToMap(procProto.getProcId(), procProto.hasParentId());<a name="line.459"></a>
+<span class="sourceLineNo">460</span>      boolean newEntry = entry.proto == null;<a name="line.460"></a>
+<span class="sourceLineNo">461</span>      // We have seen procedure WALs where the entries are out of order; see HBASE-18152.<a name="line.461"></a>
+<span class="sourceLineNo">462</span>      // To compensate, only replace the Entry procedure if for sure this new procedure<a name="line.462"></a>
+<span class="sourceLineNo">463</span>      // is indeed an entry that came later. TODO: Fix the writing of procedure info so<a name="line.463"></a>
+<span class="sourceLineNo">464</span>      // it does not violate basic expectation, that WALs contain procedure changes going<a name="line.464"></a>
+<span class="sourceLineNo">465</span>      // from start to finish in sequence.<a name="line.465"></a>
+<span class="sourceLineNo">466</span>      if (newEntry || isIncreasing(entry.proto, procProto)) {<a name="line.466"></a>
+<span class="sourceLineNo">467</span>        entry.proto = procProto;<a name="line.467"></a>
+<span class="sourceLineNo">468</span>      }<a name="line.468"></a>
+<span class="sourceLineNo">469</span>      addToReplayList(entry);<a name="line.469"></a>
+<span class="sourceLineNo">470</span>      if(newEntry) {<a name="line.470"></a>
+<span class="sourceLineNo">471</span>        if (procProto.hasParentId()) {<a name="line.471"></a>
+<span class="sourceLineNo">472</span>          childUnlinkedHead = addToLinkList(entry, childUnlinkedHead);<a name="line.472"></a>
+<span class="sourceLineNo">473</span>        } else {<a name="line.473"></a>
+<span class="sourceLineNo">474</span>          rootHead = addToLinkList(entry, rootHead);<a name="line.474"></a>
+<span class="sourceLineNo">475</span>        }<a name="line.475"></a>
+<span class="sourceLineNo">476</span>      }<a name="line.476"></a>
 <span class="sourceLineNo">477</span>    }<a name="line.477"></a>
 <span class="sourceLineNo">478</span><a name="line.478"></a>
-<span class="sourceLineNo">479</span>    public long getMaxProcId() {<a name="line.479"></a>
-<span class="sourceLineNo">480</span>      return maxProcId;<a name="line.480"></a>
-<span class="sourceLineNo">481</span>    }<a name="line.481"></a>
-<span class="sourceLineNo">482</span><a name="line.482"></a>
-<span class="sourceLineNo">483</span>    public boolean contains(long procId) {<a name="line.483"></a>
-<span class="sourceLineNo">484</span>      return getProcedure(procId) != null;<a name="line.484"></a>
-<span class="sourceLineNo">485</span>    }<a name="line.485"></a>
-<span class="sourceLineNo">486</span><a name="line.486"></a>
-<span class="sourceLineNo">487</span>    public boolean isEmpty() {<a name="line.487"></a>
-<span class="sourceLineNo">488</span>      return replayOrderHead == null;<a name="line.488"></a>
-<span class="sourceLineNo">489</span>    }<a name="line.489"></a>
-<span class="sourceLineNo">490</span><a name="line.490"></a>
-<span class="sourceLineNo">491</span>    public void clear() {<a name="line.491"></a>
-<span class="sourceLineNo">492</span>      for (int i = 0; i &lt; procedureMap.length; ++i) {<a name="line.492"></a>
-<span class="sourceLineNo">493</span>        procedureMap[i] = null;<a name="line.493"></a>
-<span class="sourceLineNo">494</span>      }<a name="line.494"></a>
-<span class="sourceLineNo">495</span>      replayOrderHead = null;<a name="line.495"></a>
-<span class="sourceLineNo">496</span>      replayOrderTail = null;<a name="line.496"></a>
-<span class="sourceLineNo">497</span>      rootHead = null;<a name="line.497"></a>
-<span class="sourceLineNo">498</span>      childUnlinkedHead = null;<a name="line.498"></a>
-<span class="sourceLineNo">499</span>      minProcId = Long.MAX_VALUE;<a name="line.499"></a>
-<span class="sourceLineNo">500</span>      maxProcId = Long.MIN_VALUE;<a name="line.500"></a>
-<span class="sourceLineNo">501</span>    }<a name="line.501"></a>
-<span class="sourceLineNo">502</span><a name="line.502"></a>
-<span class="sourceLineNo">503</span>    /*<a name="line.503"></a>
-<span class="sourceLineNo">504</span>     * Merges two WalProcedureMap,<a name="line.504"></a>
-<span class="sourceLineNo">505</span>     * the target is the "global" map, the source is the "local" map.<a name="line.505"></a>
-<span class="sourceLineNo">506</span>     *  - The entries in the hashtables are guaranteed to be unique.<a name="line.506"></a>
-<span class="sourceLineNo">507</span>     *    On replay we don't load procedures that already exist in the "global"<a name="line.507"></a>
-<span class="sourceLineNo">508</span>     *    map (the one we are merging the "local" in to).<a name="line.508"></a>
-<span class="sourceLineNo">509</span>     *  - The replayOrderList of the "local" nao will be appended to the "global"<a name="line.509"></a>
-<span class="sourceLineNo">510</span>     *    map replay list.<a name="line.510"></a>
-<span class="sourceLineNo">511</span>     *  - The "local" map will be cleared at the end of the operation.<a name="line.511"></a>
-<span class="sourceLineNo">512</span>     */<a name="line.512"></a>
-<span class="sourceLineNo">513</span>    public void mergeTail(WalProcedureMap other) {<a name="line.513"></a>
-<span class="sourceLineNo">514</span>      for (Entry p = other.replayOrderHead; p != null; p = p.replayNext) {<a name="line.514"></a>
-<span class="sourceLineNo">515</span>        int slotIndex = getMapSlot(p.getProcId());<a name="line.515"></a>
-<span class="sourceLineNo">516</span>        p.hashNext = procedureMap[slotIndex];<a name="line.516"></a>
-<span class="sourceLineNo">517</span>        procedureMap[slotIndex] = p;<a name="line.517"></a>
-<span class="sourceLineNo">518</span>      }<a name="line.518"></a>
-<span class="sourceLineNo">519</span><a name="line.519"></a>
-<span class="sourceLineNo">520</span>      if (replayOrderHead == null) {<a name="line.520"></a>
-<span class="sourceLineNo">521</span>        replayOrderHead = other.replayOrderHead;<a name="line.521"></a>
-<span class="sourceLineNo">522</span>        replayOrderTail = other.replayOrderTail;<a name="line.522"></a>
-<span class="sourceLineNo">523</span>        rootHead = other.rootHead;<a name="line.523"></a>
-<span class="sourceLineNo">524</span>        childUnlinkedHead = other.childUnlinkedHead;<a name="line.524"></a>
-<span class="sourceLineNo">525</span>      } else {<a name="line.525"></a>
-<span class="sourceLineNo">526</span>        // append replay list<a name="line.526"></a>
-<span class="sourceLineNo">527</span>        assert replayOrderTail.replayNext == null;<a name="line.527"></a>
-<span class="sourceLineNo">528</span>        assert other.replayOrderHead.replayPrev == null;<a name="line.528"></a>
-<span class="sourceLineNo">529</span>        replayOrderTail.replayNext = other.replayOrderHead;<a name="line.529"></a>
-<span class="sourceLineNo">530</span>        other.replayOrderHead.replayPrev = replayOrderTail;<a name="line.530"></a>
-<span class="sourceLineNo">531</span>        replayOrderTail = other.replayOrderTail;<a name="line.531"></a>
-<span class="sourceLineNo">532</span><a name="line.532"></a>
-<span class="sourceLineNo">533</span>        // merge rootHead<a name="line.533"></a>
-<span class="sourceLineNo">534</span>        if (rootHead == null) {<a name="line.534"></a>
-<span class="sourceLineNo">535</span>          rootHead = other.rootHead;<a name="line.535"></a>
-<span class="sourceLineNo">536</span>        } else if (other.rootHead != null) {<a name="line.536"></a>
-<span class="sourceLineNo">537</span>          Entry otherTail = findLinkListTail(other.rootHead);<a name="line.537"></a>
-<span class="sourceLineNo">538</span>          otherTail.linkNext = rootHead;<a name="line.538"></a>
-<span class="sourceLineNo">539</span>          rootHead.linkPrev = otherTail;<a name="line.539"></a>
-<span class="sourceLineNo">540</span>          rootHead = other.rootHead;<a name="line.540"></a>
-<span class="sourceLineNo">541</span>        }<a name="line.541"></a>
-<span class="sourceLineNo">542</span><a name="line.542"></a>
-<span class="sourceLineNo">543</span>        // merge childUnlinkedHead<a name="line.543"></a>
-<span class="sourceLineNo">544</span>        if (childUnlinkedHead == null) {<a name="line.544"></a>
-<span class="sourceLineNo">545</span>          childUnlinkedHead = other.childUnlinkedHead;<a name="line.545"></a>
-<span class="sourceLineNo">546</span>        } else if (other.childUnlinkedHead != null) {<a name="line.546"></a>
-<span class="sourceLineNo">547</span>          Entry otherTail = findLinkListTail(other.childUnlinkedHead);<a name="line.547"></a>
-<span class="sourceLineNo">548</span>          otherTail.linkNext = childUnlinkedHead;<a name="line.548"></a>
-<span class="sourceLineNo">549</span>          childUnlinkedHead.linkPrev = otherTail;<a name="line.549"></a>
-<span class="sourceLineNo">550</span>          childUnlinkedHead = other.childUnlinkedHead;<a name="line.550"></a>
-<span class="sourceLineNo">551</span>        }<a name="line.551"></a>
-<span class="

<TRUNCATED>

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