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| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> */<a name="line.17"></a> |
| <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.replication.regionserver;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.io.Closeable;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.io.FileNotFoundException;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.io.IOException;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.OptionalLong;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.util.concurrent.PriorityBlockingQueue;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.hadoop.conf.Configuration;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.hadoop.fs.FileStatus;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.hadoop.fs.FileSystem;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.hadoop.fs.Path;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.regionserver.wal.AbstractProtobufWALReader;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.regionserver.wal.WALHeaderEOFException;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.util.LeaseNotRecoveredException;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.util.Pair;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.wal.AbstractFSWALProvider;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.wal.WAL.Entry;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.wal.WALFactory;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.wal.WALStreamReader;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.wal.WALTailingReader;<a name="line.37"></a> |
| <span class="sourceLineNo">038</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.38"></a> |
| <span class="sourceLineNo">039</span>import org.apache.yetus.audience.InterfaceStability;<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>import org.slf4j.Logger;<a name="line.40"></a> |
| <span class="sourceLineNo">041</span>import org.slf4j.LoggerFactory;<a name="line.41"></a> |
| <span class="sourceLineNo">042</span><a name="line.42"></a> |
| <span class="sourceLineNo">043</span>/**<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * Streaming access to WAL entries. This class is given a queue of WAL {@link Path}, and continually<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> * iterates through all the WAL {@link Entry} in the queue. When it's done reading from a Path, it<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> * dequeues it and starts reading from the next.<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> */<a name="line.47"></a> |
| <span class="sourceLineNo">048</span>@InterfaceAudience.Private<a name="line.48"></a> |
| <span class="sourceLineNo">049</span>@InterfaceStability.Evolving<a name="line.49"></a> |
| <span class="sourceLineNo">050</span>class WALEntryStream implements Closeable {<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> private static final Logger LOG = LoggerFactory.getLogger(WALEntryStream.class);<a name="line.51"></a> |
| <span class="sourceLineNo">052</span><a name="line.52"></a> |
| <span class="sourceLineNo">053</span> private WALTailingReader reader;<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> private WALTailingReader.State state;<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> private Path currentPath;<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> // cache of next entry for hasNext()<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> private Entry currentEntry;<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> // position for the current entry. As now we support peek, which means that the upper layer may<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> // choose to return before reading the current entry, so it is not safe to return the value below<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> // in getPosition.<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> private long currentPositionOfEntry = 0;<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> // position after reading current entry<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> private long currentPositionOfReader = 0;<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> private final ReplicationSourceLogQueue logQueue;<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> private final String walGroupId;<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> private final FileSystem fs;<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> private final Configuration conf;<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> private final WALFileLengthProvider walFileLengthProvider;<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> private final MetricsSource metrics;<a name="line.69"></a> |
| <span class="sourceLineNo">070</span><a name="line.70"></a> |
| <span class="sourceLineNo">071</span> // we should be able to skip empty WAL files, but for safety, we still provide this config<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> // see HBASE-18137 for more details<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> private boolean eofAutoRecovery;<a name="line.73"></a> |
| <span class="sourceLineNo">074</span><a name="line.74"></a> |
| <span class="sourceLineNo">075</span> /**<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> * Create an entry stream over the given queue at the given start position<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> * @param logQueue the queue of WAL paths<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> * @param conf the {@link Configuration} to use to create {@link WALStreamReader}<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> * for this stream<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> * @param startPosition the position in the first WAL to start reading at<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> * @param walFileLengthProvider provides the length of the WAL file<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> * @param serverName the server name which all WALs belong to<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> * @param metrics the replication metrics<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> */<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> public WALEntryStream(ReplicationSourceLogQueue logQueue, FileSystem fs, Configuration conf,<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> long startPosition, WALFileLengthProvider walFileLengthProvider, MetricsSource metrics,<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> String walGroupId) {<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> this.logQueue = logQueue;<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> this.fs = fs;<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> this.conf = conf;<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> this.currentPositionOfEntry = startPosition;<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> this.walFileLengthProvider = walFileLengthProvider;<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> this.metrics = metrics;<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> this.walGroupId = walGroupId;<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> this.eofAutoRecovery = conf.getBoolean("replication.source.eof.autorecovery", false);<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> }<a name="line.96"></a> |
| <span class="sourceLineNo">097</span><a name="line.97"></a> |
| <span class="sourceLineNo">098</span> public enum HasNext {<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> /** means there is a new entry and you could use peek or next to get current entry */<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> YES,<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> /**<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> * means there are something wrong or we have reached EOF of the current file but it is not<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> * closed yet and there is no new file in the replication queue yet, you should sleep a while<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> * and try to call hasNext again<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> */<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> RETRY,<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> /**<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> * Usually this means we have finished reading a WAL file, and for simplify the implementation<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> * of this class, we just let the upper layer issue a new hasNext call again to open the next<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> * WAL file.<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> */<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> RETRY_IMMEDIATELY,<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> /**<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> * means there is no new entry and stream is end, the upper layer should close this stream and<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> * release other resources as well<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> */<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> NO<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> }<a name="line.118"></a> |
| <span class="sourceLineNo">119</span><a name="line.119"></a> |
| <span class="sourceLineNo">120</span> /**<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> * Try advance the stream if there is no entry yet. See the javadoc for {@link HasNext} for more<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> * details about the meanings of the return values.<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> * <p/><a name="line.123"></a> |
| <span class="sourceLineNo">124</span> * You can call {@link #peek()} or {@link #next()} to get the actual {@link Entry} if this method<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> * returns {@link HasNext#YES}.<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> */<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> public HasNext hasNext() {<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> if (currentEntry == null) {<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> return tryAdvanceEntry();<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> } else {<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> return HasNext.YES;<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> }<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> }<a name="line.133"></a> |
| <span class="sourceLineNo">134</span><a name="line.134"></a> |
| <span class="sourceLineNo">135</span> /**<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> * Returns the next WAL entry in this stream but does not advance.<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> * <p/><a name="line.137"></a> |
| <span class="sourceLineNo">138</span> * Must call {@link #hasNext()} first before calling this method, and if you have already called<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> * {@link #next()} to consume the current entry, you need to call {@link #hasNext()} again to<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> * advance the stream before calling this method again, otherwise it will always return<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> * {@code null}<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> * <p/><a name="line.142"></a> |
| <span class="sourceLineNo">143</span> * The reason here is that, we need to use the return value of {@link #hasNext()} to tell upper<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> * layer to retry or not, so we can not wrap the {@link #hasNext()} call inside {@link #peek()} or<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> * {@link #next()} as they have their own return value.<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> * @see #hasNext()<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> * @see #next()<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> */<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> public Entry peek() {<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> return currentEntry;<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> }<a name="line.151"></a> |
| <span class="sourceLineNo">152</span><a name="line.152"></a> |
| <span class="sourceLineNo">153</span> /**<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> * Returns the next WAL entry in this stream and advance the stream. Will throw<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> * {@link IllegalStateException} if you do not call {@link #hasNext()} before calling this method.<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> * Please see the javadoc of {@link #peek()} method to see why we need this.<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> * @throws IllegalStateException Every time you want to call this method, please call<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> * {@link #hasNext()} first, otherwise a<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> * {@link IllegalStateException} will be thrown.<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> * @see #hasNext()<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> * @see #peek()<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> */<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> public Entry next() {<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> if (currentEntry == null) {<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> throw new IllegalStateException("Call hasNext first");<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> }<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> Entry save = peek();<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> currentPositionOfEntry = currentPositionOfReader;<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> currentEntry = null;<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> state = null;<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> return save;<a name="line.171"></a> |
| <span class="sourceLineNo">172</span> }<a name="line.172"></a> |
| <span class="sourceLineNo">173</span><a name="line.173"></a> |
| <span class="sourceLineNo">174</span> /**<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> * {@inheritDoc}<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> */<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> @Override<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> public void close() {<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> closeReader();<a name="line.179"></a> |
| <span class="sourceLineNo">180</span> }<a name="line.180"></a> |
| <span class="sourceLineNo">181</span><a name="line.181"></a> |
| <span class="sourceLineNo">182</span> /** Returns the position of the last Entry returned by next() */<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> public long getPosition() {<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> return currentPositionOfEntry;<a name="line.184"></a> |
| <span class="sourceLineNo">185</span> }<a name="line.185"></a> |
| <span class="sourceLineNo">186</span><a name="line.186"></a> |
| <span class="sourceLineNo">187</span> /** Returns the {@link Path} of the current WAL */<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> public Path getCurrentPath() {<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> return currentPath;<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> }<a name="line.190"></a> |
| <span class="sourceLineNo">191</span><a name="line.191"></a> |
| <span class="sourceLineNo">192</span> private String getCurrentPathStat() {<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> StringBuilder sb = new StringBuilder();<a name="line.193"></a> |
| <span class="sourceLineNo">194</span> if (currentPath != null) {<a name="line.194"></a> |
| <span class="sourceLineNo">195</span> sb.append("currently replicating from: ").append(currentPath).append(" at position: ")<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> .append(currentPositionOfEntry).append("\n");<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> } else {<a name="line.197"></a> |
| <span class="sourceLineNo">198</span> sb.append("no replication ongoing, waiting for new log");<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> }<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> return sb.toString();<a name="line.200"></a> |
| <span class="sourceLineNo">201</span> }<a name="line.201"></a> |
| <span class="sourceLineNo">202</span><a name="line.202"></a> |
| <span class="sourceLineNo">203</span> private void setCurrentPath(Path path) {<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> this.currentPath = path;<a name="line.204"></a> |
| <span class="sourceLineNo">205</span> }<a name="line.205"></a> |
| <span class="sourceLineNo">206</span><a name="line.206"></a> |
| <span class="sourceLineNo">207</span> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "DCN_NULLPOINTER_EXCEPTION",<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> justification = "HDFS-4380")<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> private HasNext prepareReader() {<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> if (reader != null) {<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> if (state != null && state != WALTailingReader.State.NORMAL) {<a name="line.211"></a> |
| <span class="sourceLineNo">212</span> // reset before reading<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> LOG.debug("Reset reader {} to pos {}, reset compression={}", currentPath,<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> currentPositionOfEntry, state.resetCompression());<a name="line.214"></a> |
| <span class="sourceLineNo">215</span> try {<a name="line.215"></a> |
| <span class="sourceLineNo">216</span> if (currentPositionOfEntry > 0) {<a name="line.216"></a> |
| <span class="sourceLineNo">217</span> reader.resetTo(currentPositionOfEntry, state.resetCompression());<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> } else {<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> // we will read from the beginning so we should always clear the compression context<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> reader.resetTo(-1, true);<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> }<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> } catch (IOException e) {<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> LOG.warn("Failed to reset reader {} to pos {}, reset compression={}", currentPath,<a name="line.223"></a> |
| <span class="sourceLineNo">224</span> currentPositionOfEntry, state.resetCompression(), e);<a name="line.224"></a> |
| <span class="sourceLineNo">225</span> // just leave the state as is, and try resetting next time<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> return HasNext.RETRY;<a name="line.226"></a> |
| <span class="sourceLineNo">227</span> }<a name="line.227"></a> |
| <span class="sourceLineNo">228</span> } else {<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> return HasNext.YES;<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> // try open next WAL file<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> PriorityBlockingQueue<Path> queue = logQueue.getQueue(walGroupId);<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> Path nextPath = queue.peek();<a name="line.234"></a> |
| <span class="sourceLineNo">235</span> if (nextPath == null) {<a name="line.235"></a> |
| <span class="sourceLineNo">236</span> LOG.debug("No more WAL files in queue");<a name="line.236"></a> |
| <span class="sourceLineNo">237</span> // no more files in queue, this could happen for recovered queue, or for a wal group of a<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> // sync replication peer which has already been transited to DA or S.<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> setCurrentPath(null);<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> return HasNext.NO;<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> }<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> setCurrentPath(nextPath);<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> // we need to test this prior to create the reader. If not, it is possible that, while<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> // opening the file, the file is still being written so its header is incomplete and we get<a name="line.244"></a> |
| <span class="sourceLineNo">245</span> // a header EOF, but then while we test whether it is still being written, we have already<a name="line.245"></a> |
| <span class="sourceLineNo">246</span> // flushed the data out and we consider it is not being written, and then we just skip over<a name="line.246"></a> |
| <span class="sourceLineNo">247</span> // file, then we will lose the data written after opening...<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> boolean beingWritten = walFileLengthProvider.getLogFileSizeIfBeingWritten(nextPath).isPresent();<a name="line.248"></a> |
| <span class="sourceLineNo">249</span> LOG.debug("Creating new reader {}, startPosition={}, beingWritten={}", nextPath,<a name="line.249"></a> |
| <span class="sourceLineNo">250</span> currentPositionOfEntry, beingWritten);<a name="line.250"></a> |
| <span class="sourceLineNo">251</span> try {<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> reader = WALFactory.createTailingReader(fs, nextPath, conf,<a name="line.252"></a> |
| <span class="sourceLineNo">253</span> currentPositionOfEntry > 0 ? currentPositionOfEntry : -1);<a name="line.253"></a> |
| <span class="sourceLineNo">254</span> return HasNext.YES;<a name="line.254"></a> |
| <span class="sourceLineNo">255</span> } catch (WALHeaderEOFException e) {<a name="line.255"></a> |
| <span class="sourceLineNo">256</span> if (!eofAutoRecovery) {<a name="line.256"></a> |
| <span class="sourceLineNo">257</span> // if we do not enable EOF auto recovery, just let the upper layer retry<a name="line.257"></a> |
| <span class="sourceLineNo">258</span> // the replication will be stuck usually, and need to be fixed manually<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> return HasNext.RETRY;<a name="line.259"></a> |
| <span class="sourceLineNo">260</span> }<a name="line.260"></a> |
| <span class="sourceLineNo">261</span> // we hit EOF while reading the WAL header, usually this means we can just skip over this<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> // file, but we need to be careful that whether this file is still being written, if so we<a name="line.262"></a> |
| <span class="sourceLineNo">263</span> // should retry instead of skipping.<a name="line.263"></a> |
| <span class="sourceLineNo">264</span> LOG.warn("EOF while trying to open WAL reader for path: {}, startPosition={}", nextPath,<a name="line.264"></a> |
| <span class="sourceLineNo">265</span> currentPositionOfEntry, e);<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> if (beingWritten) {<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> // just retry as the file is still being written, maybe next time we could read<a name="line.267"></a> |
| <span class="sourceLineNo">268</span> // something<a name="line.268"></a> |
| <span class="sourceLineNo">269</span> return HasNext.RETRY;<a name="line.269"></a> |
| <span class="sourceLineNo">270</span> } else {<a name="line.270"></a> |
| <span class="sourceLineNo">271</span> // the file is not being written so we are safe to just skip over it<a name="line.271"></a> |
| <span class="sourceLineNo">272</span> dequeueCurrentLog();<a name="line.272"></a> |
| <span class="sourceLineNo">273</span> return HasNext.RETRY_IMMEDIATELY;<a name="line.273"></a> |
| <span class="sourceLineNo">274</span> }<a name="line.274"></a> |
| <span class="sourceLineNo">275</span> } catch (LeaseNotRecoveredException e) {<a name="line.275"></a> |
| <span class="sourceLineNo">276</span> // HBASE-15019 the WAL was not closed due to some hiccup.<a name="line.276"></a> |
| <span class="sourceLineNo">277</span> LOG.warn("Try to recover the WAL lease " + nextPath, e);<a name="line.277"></a> |
| <span class="sourceLineNo">278</span> AbstractFSWALProvider.recoverLease(conf, nextPath);<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> return HasNext.RETRY;<a name="line.279"></a> |
| <span class="sourceLineNo">280</span> } catch (IOException | NullPointerException e) {<a name="line.280"></a> |
| <span class="sourceLineNo">281</span> // For why we need to catch NPE here, see HDFS-4380 for more details<a name="line.281"></a> |
| <span class="sourceLineNo">282</span> LOG.warn("Failed to open WAL reader for path: {}", nextPath, e);<a name="line.282"></a> |
| <span class="sourceLineNo">283</span> return HasNext.RETRY;<a name="line.283"></a> |
| <span class="sourceLineNo">284</span> }<a name="line.284"></a> |
| <span class="sourceLineNo">285</span> }<a name="line.285"></a> |
| <span class="sourceLineNo">286</span><a name="line.286"></a> |
| <span class="sourceLineNo">287</span> private HasNext lastAttempt() {<a name="line.287"></a> |
| <span class="sourceLineNo">288</span> LOG.debug("Reset reader {} for the last time to pos {}, reset compression={}", currentPath,<a name="line.288"></a> |
| <span class="sourceLineNo">289</span> currentPositionOfEntry, state.resetCompression());<a name="line.289"></a> |
| <span class="sourceLineNo">290</span> try {<a name="line.290"></a> |
| <span class="sourceLineNo">291</span> reader.resetTo(currentPositionOfEntry, state.resetCompression());<a name="line.291"></a> |
| <span class="sourceLineNo">292</span> } catch (IOException e) {<a name="line.292"></a> |
| <span class="sourceLineNo">293</span> LOG.warn("Failed to reset reader {} to pos {}, reset compression={}", currentPath,<a name="line.293"></a> |
| <span class="sourceLineNo">294</span> currentPositionOfEntry, state.resetCompression(), e);<a name="line.294"></a> |
| <span class="sourceLineNo">295</span> // just leave the state as is, next time we will try to reset it again, but there is a<a name="line.295"></a> |
| <span class="sourceLineNo">296</span> // nasty problem is that, we will still reach here finally and try reset again to see if<a name="line.296"></a> |
| <span class="sourceLineNo">297</span> // the log has been fully replicated, which is redundant, can be optimized later<a name="line.297"></a> |
| <span class="sourceLineNo">298</span> return HasNext.RETRY;<a name="line.298"></a> |
| <span class="sourceLineNo">299</span> }<a name="line.299"></a> |
| <span class="sourceLineNo">300</span> Pair<WALTailingReader.State, Boolean> pair = readNextEntryAndRecordReaderPosition();<a name="line.300"></a> |
| <span class="sourceLineNo">301</span> state = pair.getFirst();<a name="line.301"></a> |
| <span class="sourceLineNo">302</span> // should not be written<a name="line.302"></a> |
| <span class="sourceLineNo">303</span> assert !pair.getSecond();<a name="line.303"></a> |
| <span class="sourceLineNo">304</span> if (!state.eof()) {<a name="line.304"></a> |
| <span class="sourceLineNo">305</span> // we still have something to read after reopen, so return YES. Or there are something wrong<a name="line.305"></a> |
| <span class="sourceLineNo">306</span> // and we need to retry<a name="line.306"></a> |
| <span class="sourceLineNo">307</span> return state == WALTailingReader.State.NORMAL ? HasNext.YES : HasNext.RETRY;<a name="line.307"></a> |
| <span class="sourceLineNo">308</span> }<a name="line.308"></a> |
| <span class="sourceLineNo">309</span> // No data available after reopen<a name="line.309"></a> |
| <span class="sourceLineNo">310</span> if (checkAllBytesParsed()) {<a name="line.310"></a> |
| <span class="sourceLineNo">311</span> // move to the next wal file and read<a name="line.311"></a> |
| <span class="sourceLineNo">312</span> dequeueCurrentLog();<a name="line.312"></a> |
| <span class="sourceLineNo">313</span> return HasNext.RETRY_IMMEDIATELY;<a name="line.313"></a> |
| <span class="sourceLineNo">314</span> } else {<a name="line.314"></a> |
| <span class="sourceLineNo">315</span> // see HBASE-15983, if checkAllBytesParsed returns false, we need to try read from<a name="line.315"></a> |
| <span class="sourceLineNo">316</span> // beginning again. Here we set position to 0 and state to ERROR_AND_RESET_COMPRESSION<a name="line.316"></a> |
| <span class="sourceLineNo">317</span> // so when calling tryAdvanceENtry next time we will reset the reader to the beginning<a name="line.317"></a> |
| <span class="sourceLineNo">318</span> // and read.<a name="line.318"></a> |
| <span class="sourceLineNo">319</span> currentPositionOfEntry = 0;<a name="line.319"></a> |
| <span class="sourceLineNo">320</span> currentPositionOfReader = 0;<a name="line.320"></a> |
| <span class="sourceLineNo">321</span> state = WALTailingReader.State.ERROR_AND_RESET_COMPRESSION;<a name="line.321"></a> |
| <span class="sourceLineNo">322</span> return HasNext.RETRY;<a name="line.322"></a> |
| <span class="sourceLineNo">323</span> }<a name="line.323"></a> |
| <span class="sourceLineNo">324</span> }<a name="line.324"></a> |
| <span class="sourceLineNo">325</span><a name="line.325"></a> |
| <span class="sourceLineNo">326</span> private HasNext tryAdvanceEntry() {<a name="line.326"></a> |
| <span class="sourceLineNo">327</span> HasNext prepared = prepareReader();<a name="line.327"></a> |
| <span class="sourceLineNo">328</span> if (prepared != HasNext.YES) {<a name="line.328"></a> |
| <span class="sourceLineNo">329</span> return prepared;<a name="line.329"></a> |
| <span class="sourceLineNo">330</span> }<a name="line.330"></a> |
| <span class="sourceLineNo">331</span><a name="line.331"></a> |
| <span class="sourceLineNo">332</span> Pair<WALTailingReader.State, Boolean> pair = readNextEntryAndRecordReaderPosition();<a name="line.332"></a> |
| <span class="sourceLineNo">333</span> state = pair.getFirst();<a name="line.333"></a> |
| <span class="sourceLineNo">334</span> boolean beingWritten = pair.getSecond();<a name="line.334"></a> |
| <span class="sourceLineNo">335</span> LOG.trace("Reading WAL {}; result={}, currently open for write={}", this.currentPath, state,<a name="line.335"></a> |
| <span class="sourceLineNo">336</span> beingWritten);<a name="line.336"></a> |
| <span class="sourceLineNo">337</span> // The below implementation needs to make sure that when beingWritten == true, we should not<a name="line.337"></a> |
| <span class="sourceLineNo">338</span> // dequeue the current WAL file in logQueue.<a name="line.338"></a> |
| <span class="sourceLineNo">339</span> switch (state) {<a name="line.339"></a> |
| <span class="sourceLineNo">340</span> case NORMAL:<a name="line.340"></a> |
| <span class="sourceLineNo">341</span> // everything is fine, just return<a name="line.341"></a> |
| <span class="sourceLineNo">342</span> return HasNext.YES;<a name="line.342"></a> |
| <span class="sourceLineNo">343</span> case EOF_WITH_TRAILER:<a name="line.343"></a> |
| <span class="sourceLineNo">344</span> // in readNextEntryAndRecordReaderPosition, we will acquire rollWriteLock, and we can only<a name="line.344"></a> |
| <span class="sourceLineNo">345</span> // schedule a close writer task, in which we will write trailer, under the rollWriteLock, so<a name="line.345"></a> |
| <span class="sourceLineNo">346</span> // typically if beingWritten == true, we should not reach here, as we need to reopen the<a name="line.346"></a> |
| <span class="sourceLineNo">347</span> // reader after writing the trailer. The only possible way to reach here while beingWritten<a name="line.347"></a> |
| <span class="sourceLineNo">348</span> // == true is due to the inflightWALClosures logic in AbstractFSWAL, as if the writer is<a name="line.348"></a> |
| <span class="sourceLineNo">349</span> // still in this map, we will consider it as beingWritten, but actually, here we could make<a name="line.349"></a> |
| <span class="sourceLineNo">350</span> // sure that the new WAL file has already been enqueued into the logQueue, so here dequeuing<a name="line.350"></a> |
| <span class="sourceLineNo">351</span> // the current log file is safe.<a name="line.351"></a> |
| <span class="sourceLineNo">352</span> if (beingWritten && logQueue.getQueue(walGroupId).size() <= 1) {<a name="line.352"></a> |
| <span class="sourceLineNo">353</span> // As explained above, if we implement everything correctly, we should not arrive here.<a name="line.353"></a> |
| <span class="sourceLineNo">354</span> // But anyway, even if we reach here due to some code changes in the future, reading<a name="line.354"></a> |
| <span class="sourceLineNo">355</span> // the file again can make sure that we will not accidentally consider the queue as<a name="line.355"></a> |
| <span class="sourceLineNo">356</span> // finished, and since there is a trailer, we will soon consider the file as finished<a name="line.356"></a> |
| <span class="sourceLineNo">357</span> // and move on.<a name="line.357"></a> |
| <span class="sourceLineNo">358</span> LOG.warn(<a name="line.358"></a> |
| <span class="sourceLineNo">359</span> "We have reached the trailer while reading the file '{}' which is currently"<a name="line.359"></a> |
| <span class="sourceLineNo">360</span> + " beingWritten, but it is the last file in log queue {}. This should not happen"<a name="line.360"></a> |
| <span class="sourceLineNo">361</span> + " typically, try to read again so we will not miss anything",<a name="line.361"></a> |
| <span class="sourceLineNo">362</span> currentPath, walGroupId);<a name="line.362"></a> |
| <span class="sourceLineNo">363</span> return HasNext.RETRY;<a name="line.363"></a> |
| <span class="sourceLineNo">364</span> }<a name="line.364"></a> |
| <span class="sourceLineNo">365</span> assert !beingWritten || logQueue.getQueue(walGroupId).size() > 1;<a name="line.365"></a> |
| <span class="sourceLineNo">366</span> // we have reached the trailer, which means this WAL file has been closed cleanly and we<a name="line.366"></a> |
| <span class="sourceLineNo">367</span> // have finished reading it successfully, just move to the next WAL file and let the upper<a name="line.367"></a> |
| <span class="sourceLineNo">368</span> // layer start reading the next WAL file<a name="line.368"></a> |
| <span class="sourceLineNo">369</span> dequeueCurrentLog();<a name="line.369"></a> |
| <span class="sourceLineNo">370</span> return HasNext.RETRY_IMMEDIATELY;<a name="line.370"></a> |
| <span class="sourceLineNo">371</span> case EOF_AND_RESET:<a name="line.371"></a> |
| <span class="sourceLineNo">372</span> case EOF_AND_RESET_COMPRESSION:<a name="line.372"></a> |
| <span class="sourceLineNo">373</span> if (beingWritten) {<a name="line.373"></a> |
| <span class="sourceLineNo">374</span> // just sleep a bit and retry to see if there are new entries coming since the file is<a name="line.374"></a> |
| <span class="sourceLineNo">375</span> // still being written<a name="line.375"></a> |
| <span class="sourceLineNo">376</span> return HasNext.RETRY;<a name="line.376"></a> |
| <span class="sourceLineNo">377</span> }<a name="line.377"></a> |
| <span class="sourceLineNo">378</span> // no more entries in this log file, and the file is already closed, i.e, rolled<a name="line.378"></a> |
| <span class="sourceLineNo">379</span> // Before dequeuing, we should always get one more attempt at reading.<a name="line.379"></a> |
| <span class="sourceLineNo">380</span> // This is in case more entries came in after we opened the reader, and the log is rolled<a name="line.380"></a> |
| <span class="sourceLineNo">381</span> // while we were reading. See HBASE-6758<a name="line.381"></a> |
| <span class="sourceLineNo">382</span> return lastAttempt();<a name="line.382"></a> |
| <span class="sourceLineNo">383</span> case ERROR_AND_RESET:<a name="line.383"></a> |
| <span class="sourceLineNo">384</span> case ERROR_AND_RESET_COMPRESSION:<a name="line.384"></a> |
| <span class="sourceLineNo">385</span> // we have meet an error, just sleep a bit and retry again<a name="line.385"></a> |
| <span class="sourceLineNo">386</span> return HasNext.RETRY;<a name="line.386"></a> |
| <span class="sourceLineNo">387</span> default:<a name="line.387"></a> |
| <span class="sourceLineNo">388</span> throw new IllegalArgumentException("Unknown read next result: " + state);<a name="line.388"></a> |
| <span class="sourceLineNo">389</span> }<a name="line.389"></a> |
| <span class="sourceLineNo">390</span> }<a name="line.390"></a> |
| <span class="sourceLineNo">391</span><a name="line.391"></a> |
| <span class="sourceLineNo">392</span> private FileStatus getCurrentPathFileStatus() throws IOException {<a name="line.392"></a> |
| <span class="sourceLineNo">393</span> try {<a name="line.393"></a> |
| <span class="sourceLineNo">394</span> return fs.getFileStatus(currentPath);<a name="line.394"></a> |
| <span class="sourceLineNo">395</span> } catch (FileNotFoundException e) {<a name="line.395"></a> |
| <span class="sourceLineNo">396</span> // try archived path<a name="line.396"></a> |
| <span class="sourceLineNo">397</span> Path archivedWAL = AbstractFSWALProvider.findArchivedLog(currentPath, conf);<a name="line.397"></a> |
| <span class="sourceLineNo">398</span> if (archivedWAL != null) {<a name="line.398"></a> |
| <span class="sourceLineNo">399</span> return fs.getFileStatus(archivedWAL);<a name="line.399"></a> |
| <span class="sourceLineNo">400</span> } else {<a name="line.400"></a> |
| <span class="sourceLineNo">401</span> throw e;<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> |
| <span class="sourceLineNo">404</span> }<a name="line.404"></a> |
| <span class="sourceLineNo">405</span><a name="line.405"></a> |
| <span class="sourceLineNo">406</span> // HBASE-15984 check to see we have in fact parsed all data in a cleanly closed file<a name="line.406"></a> |
| <span class="sourceLineNo">407</span> private boolean checkAllBytesParsed() {<a name="line.407"></a> |
| <span class="sourceLineNo">408</span> // -1 means the wal wasn't closed cleanly.<a name="line.408"></a> |
| <span class="sourceLineNo">409</span> final long trailerSize = currentTrailerSize();<a name="line.409"></a> |
| <span class="sourceLineNo">410</span> FileStatus stat = null;<a name="line.410"></a> |
| <span class="sourceLineNo">411</span> try {<a name="line.411"></a> |
| <span class="sourceLineNo">412</span> stat = getCurrentPathFileStatus();<a name="line.412"></a> |
| <span class="sourceLineNo">413</span> } catch (IOException e) {<a name="line.413"></a> |
| <span class="sourceLineNo">414</span> LOG.warn("Couldn't get file length information about log {}, it {} closed cleanly {}",<a name="line.414"></a> |
| <span class="sourceLineNo">415</span> currentPath, trailerSize < 0 ? "was not" : "was", getCurrentPathStat(), e);<a name="line.415"></a> |
| <span class="sourceLineNo">416</span> metrics.incrUnknownFileLengthForClosedWAL();<a name="line.416"></a> |
| <span class="sourceLineNo">417</span> }<a name="line.417"></a> |
| <span class="sourceLineNo">418</span> // Here we use currentPositionOfReader instead of currentPositionOfEntry.<a name="line.418"></a> |
| <span class="sourceLineNo">419</span> // We only call this method when currentEntry is null so usually they are the same, but there<a name="line.419"></a> |
| <span class="sourceLineNo">420</span> // are two exceptions. One is we have nothing in the file but only a header, in this way<a name="line.420"></a> |
| <span class="sourceLineNo">421</span> // the currentPositionOfEntry will always be 0 since we have no change to update it. The other<a name="line.421"></a> |
| <span class="sourceLineNo">422</span> // is that we reach the end of file, then currentPositionOfEntry will point to the tail of the<a name="line.422"></a> |
| <span class="sourceLineNo">423</span> // last valid entry, and the currentPositionOfReader will usually point to the end of the file.<a name="line.423"></a> |
| <span class="sourceLineNo">424</span> if (stat != null) {<a name="line.424"></a> |
| <span class="sourceLineNo">425</span> if (trailerSize < 0) {<a name="line.425"></a> |
| <span class="sourceLineNo">426</span> if (currentPositionOfReader < stat.getLen()) {<a name="line.426"></a> |
| <span class="sourceLineNo">427</span> final long skippedBytes = stat.getLen() - currentPositionOfReader;<a name="line.427"></a> |
| <span class="sourceLineNo">428</span> // See the commits in HBASE-25924/HBASE-25932 for context.<a name="line.428"></a> |
| <span class="sourceLineNo">429</span> LOG.warn("Reached the end of WAL {}. It was not closed cleanly,"<a name="line.429"></a> |
| <span class="sourceLineNo">430</span> + " so we did not parse {} bytes of data.", currentPath, skippedBytes);<a name="line.430"></a> |
| <span class="sourceLineNo">431</span> metrics.incrUncleanlyClosedWALs();<a name="line.431"></a> |
| <span class="sourceLineNo">432</span> metrics.incrBytesSkippedInUncleanlyClosedWALs(skippedBytes);<a name="line.432"></a> |
| <span class="sourceLineNo">433</span> }<a name="line.433"></a> |
| <span class="sourceLineNo">434</span> } else if (currentPositionOfReader + trailerSize < stat.getLen()) {<a name="line.434"></a> |
| <span class="sourceLineNo">435</span> LOG.warn(<a name="line.435"></a> |
| <span class="sourceLineNo">436</span> "Processing end of WAL {} at position {}, which is too far away from"<a name="line.436"></a> |
| <span class="sourceLineNo">437</span> + " reported file length {}. Restarting WAL reading (see HBASE-15983 for details). {}",<a name="line.437"></a> |
| <span class="sourceLineNo">438</span> currentPath, currentPositionOfReader, stat.getLen(), getCurrentPathStat());<a name="line.438"></a> |
| <span class="sourceLineNo">439</span> metrics.incrRestartedWALReading();<a name="line.439"></a> |
| <span class="sourceLineNo">440</span> metrics.incrRepeatedFileBytes(currentPositionOfReader);<a name="line.440"></a> |
| <span class="sourceLineNo">441</span> return false;<a name="line.441"></a> |
| <span class="sourceLineNo">442</span> }<a name="line.442"></a> |
| <span class="sourceLineNo">443</span> }<a name="line.443"></a> |
| <span class="sourceLineNo">444</span> LOG.debug("Reached the end of {} and length of the file is {}", currentPath,<a name="line.444"></a> |
| <span class="sourceLineNo">445</span> stat == null ? "N/A" : stat.getLen());<a name="line.445"></a> |
| <span class="sourceLineNo">446</span> metrics.incrCompletedWAL();<a name="line.446"></a> |
| <span class="sourceLineNo">447</span> return true;<a name="line.447"></a> |
| <span class="sourceLineNo">448</span> }<a name="line.448"></a> |
| <span class="sourceLineNo">449</span><a name="line.449"></a> |
| <span class="sourceLineNo">450</span> private void dequeueCurrentLog() {<a name="line.450"></a> |
| <span class="sourceLineNo">451</span> LOG.debug("EOF, closing {}", currentPath);<a name="line.451"></a> |
| <span class="sourceLineNo">452</span> closeReader();<a name="line.452"></a> |
| <span class="sourceLineNo">453</span> logQueue.remove(walGroupId);<a name="line.453"></a> |
| <span class="sourceLineNo">454</span> setCurrentPath(null);<a name="line.454"></a> |
| <span class="sourceLineNo">455</span> currentPositionOfEntry = 0;<a name="line.455"></a> |
| <span class="sourceLineNo">456</span> state = null;<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> /**<a name="line.459"></a> |
| <span class="sourceLineNo">460</span> * Returns whether the file is opened for writing.<a name="line.460"></a> |
| <span class="sourceLineNo">461</span> */<a name="line.461"></a> |
| <span class="sourceLineNo">462</span> private Pair<WALTailingReader.State, Boolean> readNextEntryAndRecordReaderPosition() {<a name="line.462"></a> |
| <span class="sourceLineNo">463</span> OptionalLong fileLength;<a name="line.463"></a> |
| <span class="sourceLineNo">464</span> if (logQueue.getQueueSize(walGroupId) > 1) {<a name="line.464"></a> |
| <span class="sourceLineNo">465</span> // if there are more than one files in queue, although it is possible that we are<a name="line.465"></a> |
| <span class="sourceLineNo">466</span> // still trying to write the trailer of the file and it is not closed yet, we can<a name="line.466"></a> |
| <span class="sourceLineNo">467</span> // make sure that we will not write any WAL entries to it any more, so it is safe<a name="line.467"></a> |
| <span class="sourceLineNo">468</span> // to just let the upper layer try to read the whole file without limit<a name="line.468"></a> |
| <span class="sourceLineNo">469</span> fileLength = OptionalLong.empty();<a name="line.469"></a> |
| <span class="sourceLineNo">470</span> } else {<a name="line.470"></a> |
| <span class="sourceLineNo">471</span> // if there is only one file in queue, check whether it is still being written to<a name="line.471"></a> |
| <span class="sourceLineNo">472</span> // we must call this before actually reading from the reader, as this method will acquire the<a name="line.472"></a> |
| <span class="sourceLineNo">473</span> // rollWriteLock. This is very important, as we will enqueue the new WAL file in postLogRoll,<a name="line.473"></a> |
| <span class="sourceLineNo">474</span> // and before this happens, we could have already finished closing the previous WAL file. If<a name="line.474"></a> |
| <span class="sourceLineNo">475</span> // we do not acquire the rollWriteLock and return whether the current file is being written<a name="line.475"></a> |
| <span class="sourceLineNo">476</span> // to, we may finish reading the previous WAL file and start to read the next one, before it<a name="line.476"></a> |
| <span class="sourceLineNo">477</span> // is enqueued into the logQueue, thus lead to an empty logQueue and make the shipper think<a name="line.477"></a> |
| <span class="sourceLineNo">478</span> // the queue is already ended and quit. See HBASE-28114 and related issues for more details.<a name="line.478"></a> |
| <span class="sourceLineNo">479</span> // in the future, if we want to optimize the logic here, for example, do not call this method<a name="line.479"></a> |
| <span class="sourceLineNo">480</span> // every time, or do not acquire rollWriteLock in the implementation of this method, we need<a name="line.480"></a> |
| <span class="sourceLineNo">481</span> // to carefully review the optimized implementation<a name="line.481"></a> |
| <span class="sourceLineNo">482</span> fileLength = walFileLengthProvider.getLogFileSizeIfBeingWritten(currentPath);<a name="line.482"></a> |
| <span class="sourceLineNo">483</span> }<a name="line.483"></a> |
| <span class="sourceLineNo">484</span> WALTailingReader.Result readResult = reader.next(fileLength.orElse(-1));<a name="line.484"></a> |
| <span class="sourceLineNo">485</span> long readerPos = readResult.getEntryEndPos();<a name="line.485"></a> |
| <span class="sourceLineNo">486</span> Entry readEntry = readResult.getEntry();<a name="line.486"></a> |
| <span class="sourceLineNo">487</span> if (readResult.getState() == WALTailingReader.State.NORMAL) {<a name="line.487"></a> |
| <span class="sourceLineNo">488</span> LOG.trace("reading entry: {} ", readEntry);<a name="line.488"></a> |
| <span class="sourceLineNo">489</span> metrics.incrLogEditsRead();<a name="line.489"></a> |
| <span class="sourceLineNo">490</span> metrics.incrLogReadInBytes(readerPos - currentPositionOfEntry);<a name="line.490"></a> |
| <span class="sourceLineNo">491</span> // record current entry and reader position<a name="line.491"></a> |
| <span class="sourceLineNo">492</span> currentEntry = readResult.getEntry();<a name="line.492"></a> |
| <span class="sourceLineNo">493</span> this.currentPositionOfReader = readerPos;<a name="line.493"></a> |
| <span class="sourceLineNo">494</span> } else {<a name="line.494"></a> |
| <span class="sourceLineNo">495</span> LOG.trace("reading entry failed with: {}", readResult.getState());<a name="line.495"></a> |
| <span class="sourceLineNo">496</span> // set current entry to null<a name="line.496"></a> |
| <span class="sourceLineNo">497</span> currentEntry = null;<a name="line.497"></a> |
| <span class="sourceLineNo">498</span> try {<a name="line.498"></a> |
| <span class="sourceLineNo">499</span> this.currentPositionOfReader = reader.getPosition();<a name="line.499"></a> |
| <span class="sourceLineNo">500</span> } catch (IOException e) {<a name="line.500"></a> |
| <span class="sourceLineNo">501</span> LOG.warn("failed to get current position of reader", e);<a name="line.501"></a> |
| <span class="sourceLineNo">502</span> if (readResult.getState().resetCompression()) {<a name="line.502"></a> |
| <span class="sourceLineNo">503</span> return Pair.newPair(WALTailingReader.State.ERROR_AND_RESET_COMPRESSION,<a name="line.503"></a> |
| <span class="sourceLineNo">504</span> fileLength.isPresent());<a name="line.504"></a> |
| <span class="sourceLineNo">505</span> }<a name="line.505"></a> |
| <span class="sourceLineNo">506</span> }<a name="line.506"></a> |
| <span class="sourceLineNo">507</span> }<a name="line.507"></a> |
| <span class="sourceLineNo">508</span> return Pair.newPair(readResult.getState(), fileLength.isPresent());<a name="line.508"></a> |
| <span class="sourceLineNo">509</span> }<a name="line.509"></a> |
| <span class="sourceLineNo">510</span><a name="line.510"></a> |
| <span class="sourceLineNo">511</span> private void closeReader() {<a name="line.511"></a> |
| <span class="sourceLineNo">512</span> if (reader != null) {<a name="line.512"></a> |
| <span class="sourceLineNo">513</span> reader.close();<a name="line.513"></a> |
| <span class="sourceLineNo">514</span> reader = null;<a name="line.514"></a> |
| <span class="sourceLineNo">515</span> }<a name="line.515"></a> |
| <span class="sourceLineNo">516</span> }<a name="line.516"></a> |
| <span class="sourceLineNo">517</span><a name="line.517"></a> |
| <span class="sourceLineNo">518</span> private long currentTrailerSize() {<a name="line.518"></a> |
| <span class="sourceLineNo">519</span> long size = -1L;<a name="line.519"></a> |
| <span class="sourceLineNo">520</span> if (reader instanceof AbstractProtobufWALReader) {<a name="line.520"></a> |
| <span class="sourceLineNo">521</span> final AbstractProtobufWALReader pbwr = (AbstractProtobufWALReader) reader;<a name="line.521"></a> |
| <span class="sourceLineNo">522</span> size = pbwr.trailerSize();<a name="line.522"></a> |
| <span class="sourceLineNo">523</span> }<a name="line.523"></a> |
| <span class="sourceLineNo">524</span> return size;<a name="line.524"></a> |
| <span class="sourceLineNo">525</span> }<a name="line.525"></a> |
| <span class="sourceLineNo">526</span>}<a name="line.526"></a> |
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| </pre> |
| </div> |
| </body> |
| </html> |
