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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.io;<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.IOException;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.io.InputStream;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.lang.reflect.InvocationTargetException;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.lang.reflect.Method;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span><a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.commons.io.IOUtils;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.hadoop.fs.FSDataInputStream;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.fs.FileSystem;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.fs.Path;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.fs.HFileSystem;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.slf4j.Logger;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.slf4j.LoggerFactory;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span><a name="line.35"></a> |
| <span class="sourceLineNo">036</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span><a name="line.37"></a> |
| <span class="sourceLineNo">038</span>/**<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> * Wrapper for input stream(s) that takes care of the interaction of FS and HBase checksums,<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * as well as closing streams. Initialization is not thread-safe, but normal operation is;<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * see method comments.<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> */<a name="line.42"></a> |
| <span class="sourceLineNo">043</span>@InterfaceAudience.Private<a name="line.43"></a> |
| <span class="sourceLineNo">044</span>public class FSDataInputStreamWrapper implements Closeable {<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> private static final Logger LOG = LoggerFactory.getLogger(FSDataInputStreamWrapper.class);<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> private static final boolean isLogTraceEnabled = LOG.isTraceEnabled();<a name="line.46"></a> |
| <span class="sourceLineNo">047</span><a name="line.47"></a> |
| <span class="sourceLineNo">048</span> private final HFileSystem hfs;<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> private final Path path;<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> private final FileLink link;<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> private final boolean doCloseStreams;<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> private final boolean dropBehind;<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> private final long readahead;<a name="line.53"></a> |
| <span class="sourceLineNo">054</span><a name="line.54"></a> |
| <span class="sourceLineNo">055</span> /** Two stream handles, one with and one without FS-level checksum.<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> * HDFS checksum setting is on FS level, not single read level, so you have to keep two<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> * FS objects and two handles open to interleave different reads freely, which is very sad.<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> * This is what we do:<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> * 1) First, we need to read the trailer of HFile to determine checksum parameters.<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> * We always use FS checksum to do that, so ctor opens {@link #stream}.<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> * 2.1) After that, if HBase checksum is not used, we'd just always use {@link #stream};<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> * 2.2) If HBase checksum can be used, we'll open {@link #streamNoFsChecksum},<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> * and close {@link #stream}. User MUST call prepareForBlockReader for that to happen;<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> * if they don't, (2.1) will be the default.<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> * 3) The users can call {@link #shouldUseHBaseChecksum()}, and pass its result to<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> * {@link #getStream(boolean)} to get stream (if Java had out/pointer params we could<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * return both in one call). This stream is guaranteed to be set.<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> * 4) The first time HBase checksum fails, one would call {@link #fallbackToFsChecksum(int)}.<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> * That will take lock, and open {@link #stream}. While this is going on, others will<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> * continue to use the old stream; if they also want to fall back, they'll also call<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> * {@link #fallbackToFsChecksum(int)}, and block until {@link #stream} is set.<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> * 5) After some number of checksumOk() calls, we will go back to using HBase checksum.<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> * We will have 2 handles; however we presume checksums fail so rarely that we don't care.<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> */<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> private volatile FSDataInputStream stream = null;<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> private volatile FSDataInputStream streamNoFsChecksum = null;<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> private final Object streamNoFsChecksumFirstCreateLock = new Object();<a name="line.77"></a> |
| <span class="sourceLineNo">078</span><a name="line.78"></a> |
| <span class="sourceLineNo">079</span> // The configuration states that we should validate hbase checksums<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> private boolean useHBaseChecksumConfigured;<a name="line.80"></a> |
| <span class="sourceLineNo">081</span><a name="line.81"></a> |
| <span class="sourceLineNo">082</span> // Record the current state of this reader with respect to<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> // validating checkums in HBase. This is originally set the same<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> // value as useHBaseChecksumConfigured, but can change state as and when<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> // we encounter checksum verification failures.<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> private volatile boolean useHBaseChecksum;<a name="line.86"></a> |
| <span class="sourceLineNo">087</span><a name="line.87"></a> |
| <span class="sourceLineNo">088</span> // In the case of a checksum failure, do these many succeeding<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> // reads without hbase checksum verification.<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> private AtomicInteger hbaseChecksumOffCount = new AtomicInteger(-1);<a name="line.90"></a> |
| <span class="sourceLineNo">091</span><a name="line.91"></a> |
| <span class="sourceLineNo">092</span> private Boolean instanceOfCanUnbuffer = null;<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> // Using reflection to get org.apache.hadoop.fs.CanUnbuffer#unbuffer method to avoid compilation<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> // errors against Hadoop pre 2.6.4 and 2.7.1 versions.<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> private Method unbuffer = null;<a name="line.95"></a> |
| <span class="sourceLineNo">096</span><a name="line.96"></a> |
| <span class="sourceLineNo">097</span> public FSDataInputStreamWrapper(FileSystem fs, Path path) throws IOException {<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> this(fs, path, false, -1L);<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> }<a name="line.99"></a> |
| <span class="sourceLineNo">100</span><a name="line.100"></a> |
| <span class="sourceLineNo">101</span> public FSDataInputStreamWrapper(FileSystem fs, Path path, boolean dropBehind, long readahead) throws IOException {<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> this(fs, null, path, dropBehind, readahead);<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> }<a name="line.103"></a> |
| <span class="sourceLineNo">104</span><a name="line.104"></a> |
| <span class="sourceLineNo">105</span> public FSDataInputStreamWrapper(FileSystem fs, FileLink link,<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> boolean dropBehind, long readahead) throws IOException {<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> this(fs, link, null, dropBehind, readahead);<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> }<a name="line.108"></a> |
| <span class="sourceLineNo">109</span><a name="line.109"></a> |
| <span class="sourceLineNo">110</span> private FSDataInputStreamWrapper(FileSystem fs, FileLink link, Path path, boolean dropBehind,<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> long readahead) throws IOException {<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> assert (path == null) != (link == null);<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> this.path = path;<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> this.link = link;<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> this.doCloseStreams = true;<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> this.dropBehind = dropBehind;<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> this.readahead = readahead;<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> // If the fs is not an instance of HFileSystem, then create an instance of HFileSystem<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> // that wraps over the specified fs. In this case, we will not be able to avoid<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> // checksumming inside the filesystem.<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> this.hfs = (fs instanceof HFileSystem) ? (HFileSystem) fs : new HFileSystem(fs);<a name="line.121"></a> |
| <span class="sourceLineNo">122</span><a name="line.122"></a> |
| <span class="sourceLineNo">123</span> // Initially we are going to read the tail block. Open the reader w/FS checksum.<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> this.useHBaseChecksumConfigured = this.useHBaseChecksum = false;<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> this.stream = (link != null) ? link.open(hfs) : hfs.open(path);<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> setStreamOptions(stream);<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> }<a name="line.127"></a> |
| <span class="sourceLineNo">128</span><a name="line.128"></a> |
| <span class="sourceLineNo">129</span> private void setStreamOptions(FSDataInputStream in) {<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> try {<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> in.setDropBehind(dropBehind);<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> } catch (Exception e) {<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> // Skipped.<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> }<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> if (readahead >= 0) {<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> try {<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> in.setReadahead(readahead);<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> } catch (Exception e) {<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> // Skipped.<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> }<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><a name="line.143"></a> |
| <span class="sourceLineNo">144</span> /**<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> * Prepares the streams for block reader. NOT THREAD SAFE. Must be called once, after any<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> * reads finish and before any other reads start (what happens in reality is we read the<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> * tail, then call this based on what's in the tail, then read blocks).<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> * @param forceNoHBaseChecksum Force not using HBase checksum.<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> */<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> public void prepareForBlockReader(boolean forceNoHBaseChecksum) throws IOException {<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> if (hfs == null) return;<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> assert this.stream != null && !this.useHBaseChecksumConfigured;<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> boolean useHBaseChecksum =<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> !forceNoHBaseChecksum && hfs.useHBaseChecksum() && (hfs.getNoChecksumFs() != hfs);<a name="line.154"></a> |
| <span class="sourceLineNo">155</span><a name="line.155"></a> |
| <span class="sourceLineNo">156</span> if (useHBaseChecksum) {<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> FileSystem fsNc = hfs.getNoChecksumFs();<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> this.streamNoFsChecksum = (link != null) ? link.open(fsNc) : fsNc.open(path);<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> setStreamOptions(streamNoFsChecksum);<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> this.useHBaseChecksumConfigured = this.useHBaseChecksum = useHBaseChecksum;<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> // Close the checksum stream; we will reopen it if we get an HBase checksum failure.<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> this.stream.close();<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> this.stream = null;<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> }<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> }<a name="line.165"></a> |
| <span class="sourceLineNo">166</span><a name="line.166"></a> |
| <span class="sourceLineNo">167</span> /** For use in tests. */<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> @VisibleForTesting<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> public FSDataInputStreamWrapper(FSDataInputStream fsdis) {<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> this(fsdis, fsdis);<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> /** For use in tests. */<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> @VisibleForTesting<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> public FSDataInputStreamWrapper(FSDataInputStream fsdis, FSDataInputStream noChecksum) {<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> doCloseStreams = false;<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> stream = fsdis;<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> streamNoFsChecksum = noChecksum;<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> path = null;<a name="line.179"></a> |
| <span class="sourceLineNo">180</span> link = null;<a name="line.180"></a> |
| <span class="sourceLineNo">181</span> hfs = null;<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> useHBaseChecksumConfigured = useHBaseChecksum = false;<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> dropBehind = false;<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> readahead = 0;<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> /**<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> * @return Whether we are presently using HBase checksum.<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> */<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> public boolean shouldUseHBaseChecksum() {<a name="line.190"></a> |
| <span class="sourceLineNo">191</span> return this.useHBaseChecksum;<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> * Get the stream to use. Thread-safe.<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> * @param useHBaseChecksum must be the value that shouldUseHBaseChecksum has returned<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> * at some point in the past, otherwise the result is undefined.<a name="line.197"></a> |
| <span class="sourceLineNo">198</span> */<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> public FSDataInputStream getStream(boolean useHBaseChecksum) {<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> return useHBaseChecksum ? this.streamNoFsChecksum : this.stream;<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> /**<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> * Read from non-checksum stream failed, fall back to FS checksum. Thread-safe.<a name="line.204"></a> |
| <span class="sourceLineNo">205</span> * @param offCount For how many checksumOk calls to turn off the HBase checksum.<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> */<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> public FSDataInputStream fallbackToFsChecksum(int offCount) throws IOException {<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> // checksumOffCount is speculative, but let's try to reset it less.<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> boolean partOfConvoy = false;<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> if (this.stream == null) {<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> synchronized (streamNoFsChecksumFirstCreateLock) {<a name="line.211"></a> |
| <span class="sourceLineNo">212</span> partOfConvoy = (this.stream != null);<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> if (!partOfConvoy) {<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> this.stream = (link != null) ? link.open(hfs) : hfs.open(path);<a name="line.214"></a> |
| <span class="sourceLineNo">215</span> }<a name="line.215"></a> |
| <span class="sourceLineNo">216</span> }<a name="line.216"></a> |
| <span class="sourceLineNo">217</span> }<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> if (!partOfConvoy) {<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> this.useHBaseChecksum = false;<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> this.hbaseChecksumOffCount.set(offCount);<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> }<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> return this.stream;<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> /** Report that checksum was ok, so we may ponder going back to HBase checksum. */<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> public void checksumOk() {<a name="line.226"></a> |
| <span class="sourceLineNo">227</span> if (this.useHBaseChecksumConfigured && !this.useHBaseChecksum<a name="line.227"></a> |
| <span class="sourceLineNo">228</span> && (this.hbaseChecksumOffCount.getAndDecrement() < 0)) {<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> // The stream we need is already open (because we were using HBase checksum in the past).<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> assert this.streamNoFsChecksum != null;<a name="line.230"></a> |
| <span class="sourceLineNo">231</span> this.useHBaseChecksum = true;<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> }<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> }<a name="line.233"></a> |
| <span class="sourceLineNo">234</span><a name="line.234"></a> |
| <span class="sourceLineNo">235</span> /** Close stream(s) if necessary. */<a name="line.235"></a> |
| <span class="sourceLineNo">236</span> @Override<a name="line.236"></a> |
| <span class="sourceLineNo">237</span> public void close() {<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> if (!doCloseStreams) {<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> return;<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> }<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> // we do not care about the close exception as it is for reading, no data loss issue.<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> IOUtils.closeQuietly(streamNoFsChecksum);<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> IOUtils.closeQuietly(stream);<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> }<a name="line.244"></a> |
| <span class="sourceLineNo">245</span><a name="line.245"></a> |
| <span class="sourceLineNo">246</span> public HFileSystem getHfs() {<a name="line.246"></a> |
| <span class="sourceLineNo">247</span> return this.hfs;<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> }<a name="line.248"></a> |
| <span class="sourceLineNo">249</span><a name="line.249"></a> |
| <span class="sourceLineNo">250</span> /**<a name="line.250"></a> |
| <span class="sourceLineNo">251</span> * This will free sockets and file descriptors held by the stream only when the stream implements<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> * org.apache.hadoop.fs.CanUnbuffer. NOT THREAD SAFE. Must be called only when all the clients<a name="line.252"></a> |
| <span class="sourceLineNo">253</span> * using this stream to read the blocks have finished reading. If by chance the stream is<a name="line.253"></a> |
| <span class="sourceLineNo">254</span> * unbuffered and there are clients still holding this stream for read then on next client read<a name="line.254"></a> |
| <span class="sourceLineNo">255</span> * request a new socket will be opened by Datanode without client knowing about it and will serve<a name="line.255"></a> |
| <span class="sourceLineNo">256</span> * its read request. Note: If this socket is idle for some time then the DataNode will close the<a name="line.256"></a> |
| <span class="sourceLineNo">257</span> * socket and the socket will move into CLOSE_WAIT state and on the next client request on this<a name="line.257"></a> |
| <span class="sourceLineNo">258</span> * stream, the current socket will be closed and a new socket will be opened to serve the<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> * requests.<a name="line.259"></a> |
| <span class="sourceLineNo">260</span> */<a name="line.260"></a> |
| <span class="sourceLineNo">261</span> @SuppressWarnings({ "rawtypes" })<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> public void unbuffer() {<a name="line.262"></a> |
| <span class="sourceLineNo">263</span> FSDataInputStream stream = this.getStream(this.shouldUseHBaseChecksum());<a name="line.263"></a> |
| <span class="sourceLineNo">264</span> if (stream != null) {<a name="line.264"></a> |
| <span class="sourceLineNo">265</span> InputStream wrappedStream = stream.getWrappedStream();<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> // CanUnbuffer interface was added as part of HDFS-7694 and the fix is available in Hadoop<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> // 2.6.4+ and 2.7.1+ versions only so check whether the stream object implements the<a name="line.267"></a> |
| <span class="sourceLineNo">268</span> // CanUnbuffer interface or not and based on that call the unbuffer api.<a name="line.268"></a> |
| <span class="sourceLineNo">269</span> final Class<? extends InputStream> streamClass = wrappedStream.getClass();<a name="line.269"></a> |
| <span class="sourceLineNo">270</span> if (this.instanceOfCanUnbuffer == null) {<a name="line.270"></a> |
| <span class="sourceLineNo">271</span> // To ensure we compute whether the stream is instance of CanUnbuffer only once.<a name="line.271"></a> |
| <span class="sourceLineNo">272</span> this.instanceOfCanUnbuffer = false;<a name="line.272"></a> |
| <span class="sourceLineNo">273</span> Class<?>[] streamInterfaces = streamClass.getInterfaces();<a name="line.273"></a> |
| <span class="sourceLineNo">274</span> for (Class c : streamInterfaces) {<a name="line.274"></a> |
| <span class="sourceLineNo">275</span> if (c.getCanonicalName().toString().equals("org.apache.hadoop.fs.CanUnbuffer")) {<a name="line.275"></a> |
| <span class="sourceLineNo">276</span> try {<a name="line.276"></a> |
| <span class="sourceLineNo">277</span> this.unbuffer = streamClass.getDeclaredMethod("unbuffer");<a name="line.277"></a> |
| <span class="sourceLineNo">278</span> } catch (NoSuchMethodException | SecurityException e) {<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> if (isLogTraceEnabled) {<a name="line.279"></a> |
| <span class="sourceLineNo">280</span> LOG.trace("Failed to find 'unbuffer' method in class " + streamClass<a name="line.280"></a> |
| <span class="sourceLineNo">281</span> + " . So there may be a TCP socket connection "<a name="line.281"></a> |
| <span class="sourceLineNo">282</span> + "left open in CLOSE_WAIT state.", e);<a name="line.282"></a> |
| <span class="sourceLineNo">283</span> }<a name="line.283"></a> |
| <span class="sourceLineNo">284</span> return;<a name="line.284"></a> |
| <span class="sourceLineNo">285</span> }<a name="line.285"></a> |
| <span class="sourceLineNo">286</span> this.instanceOfCanUnbuffer = true;<a name="line.286"></a> |
| <span class="sourceLineNo">287</span> break;<a name="line.287"></a> |
| <span class="sourceLineNo">288</span> }<a name="line.288"></a> |
| <span class="sourceLineNo">289</span> }<a name="line.289"></a> |
| <span class="sourceLineNo">290</span> }<a name="line.290"></a> |
| <span class="sourceLineNo">291</span> if (this.instanceOfCanUnbuffer) {<a name="line.291"></a> |
| <span class="sourceLineNo">292</span> try {<a name="line.292"></a> |
| <span class="sourceLineNo">293</span> this.unbuffer.invoke(wrappedStream);<a name="line.293"></a> |
| <span class="sourceLineNo">294</span> } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {<a name="line.294"></a> |
| <span class="sourceLineNo">295</span> if (isLogTraceEnabled) {<a name="line.295"></a> |
| <span class="sourceLineNo">296</span> LOG.trace("Failed to invoke 'unbuffer' method in class " + streamClass<a name="line.296"></a> |
| <span class="sourceLineNo">297</span> + " . So there may be a TCP socket connection left open in CLOSE_WAIT state.", e);<a name="line.297"></a> |
| <span class="sourceLineNo">298</span> }<a name="line.298"></a> |
| <span class="sourceLineNo">299</span> }<a name="line.299"></a> |
| <span class="sourceLineNo">300</span> } else {<a name="line.300"></a> |
| <span class="sourceLineNo">301</span> if (isLogTraceEnabled) {<a name="line.301"></a> |
| <span class="sourceLineNo">302</span> LOG.trace("Failed to find 'unbuffer' method in class " + streamClass<a name="line.302"></a> |
| <span class="sourceLineNo">303</span> + " . So there may be a TCP socket connection "<a name="line.303"></a> |
| <span class="sourceLineNo">304</span> + "left open in CLOSE_WAIT state. For more details check "<a name="line.304"></a> |
| <span class="sourceLineNo">305</span> + "https://issues.apache.org/jira/browse/HBASE-9393");<a name="line.305"></a> |
| <span class="sourceLineNo">306</span> }<a name="line.306"></a> |
| <span class="sourceLineNo">307</span> }<a name="line.307"></a> |
| <span class="sourceLineNo">308</span> }<a name="line.308"></a> |
| <span class="sourceLineNo">309</span> }<a name="line.309"></a> |
| <span class="sourceLineNo">310</span>}<a name="line.310"></a> |
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| </pre> |
| </div> |
| </body> |
| </html> |
