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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><a name="line.18"></a>
<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.util;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.io.BufferedReader;<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.io.InputStream;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.io.InputStreamReader;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.lang.management.ManagementFactory;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.lang.management.OperatingSystemMXBean;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.lang.management.RuntimeMXBean;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.lang.reflect.Method;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.nio.charset.StandardCharsets;<a name="line.29"></a>
<span class="sourceLineNo">030</span><a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.slf4j.Logger;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.slf4j.LoggerFactory;<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>/**<a name="line.36"></a>
<span class="sourceLineNo">037</span> * This class is a wrapper for the implementation of<a name="line.37"></a>
<span class="sourceLineNo">038</span> * com.sun.management.UnixOperatingSystemMXBean<a name="line.38"></a>
<span class="sourceLineNo">039</span> * It will decide to use the sun api or its own implementation<a name="line.39"></a>
<span class="sourceLineNo">040</span> * depending on the runtime (vendor) used.<a name="line.40"></a>
<span class="sourceLineNo">041</span> */<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 JVM {<a name="line.44"></a>
<span class="sourceLineNo">045</span> private static final Logger LOG = LoggerFactory.getLogger(JVM.class);<a name="line.45"></a>
<span class="sourceLineNo">046</span> private OperatingSystemMXBean osMbean;<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span> private static final boolean ibmvendor =<a name="line.48"></a>
<span class="sourceLineNo">049</span> System.getProperty("java.vendor") != null &amp;&amp;<a name="line.49"></a>
<span class="sourceLineNo">050</span> System.getProperty("java.vendor").contains("IBM");<a name="line.50"></a>
<span class="sourceLineNo">051</span> private static final boolean windows =<a name="line.51"></a>
<span class="sourceLineNo">052</span> System.getProperty("os.name") != null &amp;&amp;<a name="line.52"></a>
<span class="sourceLineNo">053</span> System.getProperty("os.name").startsWith("Windows");<a name="line.53"></a>
<span class="sourceLineNo">054</span> private static final boolean linux =<a name="line.54"></a>
<span class="sourceLineNo">055</span> System.getProperty("os.name") != null &amp;&amp;<a name="line.55"></a>
<span class="sourceLineNo">056</span> System.getProperty("os.name").startsWith("Linux");<a name="line.56"></a>
<span class="sourceLineNo">057</span> private static final boolean amd64 =<a name="line.57"></a>
<span class="sourceLineNo">058</span> System.getProperty("os.arch") != null &amp;&amp;<a name="line.58"></a>
<span class="sourceLineNo">059</span> System.getProperty("os.arch").contains("amd64");<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span> private static final String JVMVersion = System.getProperty("java.version");<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span> /**<a name="line.63"></a>
<span class="sourceLineNo">064</span> * Constructor. Get the running Operating System instance<a name="line.64"></a>
<span class="sourceLineNo">065</span> */<a name="line.65"></a>
<span class="sourceLineNo">066</span> public JVM() {<a name="line.66"></a>
<span class="sourceLineNo">067</span> this.osMbean = ManagementFactory.getOperatingSystemMXBean();<a name="line.67"></a>
<span class="sourceLineNo">068</span> }<a name="line.68"></a>
<span class="sourceLineNo">069</span><a name="line.69"></a>
<span class="sourceLineNo">070</span> /**<a name="line.70"></a>
<span class="sourceLineNo">071</span> * Check if the OS is unix.<a name="line.71"></a>
<span class="sourceLineNo">072</span> *<a name="line.72"></a>
<span class="sourceLineNo">073</span> * @return whether this is unix or not.<a name="line.73"></a>
<span class="sourceLineNo">074</span> */<a name="line.74"></a>
<span class="sourceLineNo">075</span> public static boolean isUnix() {<a name="line.75"></a>
<span class="sourceLineNo">076</span> if (windows) {<a name="line.76"></a>
<span class="sourceLineNo">077</span> return false;<a name="line.77"></a>
<span class="sourceLineNo">078</span> }<a name="line.78"></a>
<span class="sourceLineNo">079</span> return (ibmvendor ? linux : true);<a name="line.79"></a>
<span class="sourceLineNo">080</span> }<a name="line.80"></a>
<span class="sourceLineNo">081</span><a name="line.81"></a>
<span class="sourceLineNo">082</span> /**<a name="line.82"></a>
<span class="sourceLineNo">083</span> * Check if the OS is linux.<a name="line.83"></a>
<span class="sourceLineNo">084</span> *<a name="line.84"></a>
<span class="sourceLineNo">085</span> * @return whether this is linux or not.<a name="line.85"></a>
<span class="sourceLineNo">086</span> */<a name="line.86"></a>
<span class="sourceLineNo">087</span> public static boolean isLinux() {<a name="line.87"></a>
<span class="sourceLineNo">088</span> return linux;<a name="line.88"></a>
<span class="sourceLineNo">089</span> }<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>
<span class="sourceLineNo">091</span> /**<a name="line.91"></a>
<span class="sourceLineNo">092</span> * Check if the arch is amd64;<a name="line.92"></a>
<span class="sourceLineNo">093</span> *<a name="line.93"></a>
<span class="sourceLineNo">094</span> * @return whether this is amd64 or not.<a name="line.94"></a>
<span class="sourceLineNo">095</span> */<a name="line.95"></a>
<span class="sourceLineNo">096</span> public static boolean isAmd64() {<a name="line.96"></a>
<span class="sourceLineNo">097</span> return amd64;<a name="line.97"></a>
<span class="sourceLineNo">098</span> }<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> * Check if the finish() method of GZIPOutputStream is broken<a name="line.101"></a>
<span class="sourceLineNo">102</span> *<a name="line.102"></a>
<span class="sourceLineNo">103</span> * @return whether GZIPOutputStream.finish() is broken.<a name="line.103"></a>
<span class="sourceLineNo">104</span> */<a name="line.104"></a>
<span class="sourceLineNo">105</span> public static boolean isGZIPOutputStreamFinishBroken() {<a name="line.105"></a>
<span class="sourceLineNo">106</span> return ibmvendor &amp;&amp; JVMVersion.contains("1.6.0");<a name="line.106"></a>
<span class="sourceLineNo">107</span> }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span> /**<a name="line.109"></a>
<span class="sourceLineNo">110</span> * Load the implementation of UnixOperatingSystemMXBean for Oracle jvm<a name="line.110"></a>
<span class="sourceLineNo">111</span> * and runs the desired method.<a name="line.111"></a>
<span class="sourceLineNo">112</span> *<a name="line.112"></a>
<span class="sourceLineNo">113</span> * @param mBeanMethodName : method to run from the interface UnixOperatingSystemMXBean<a name="line.113"></a>
<span class="sourceLineNo">114</span> *<a name="line.114"></a>
<span class="sourceLineNo">115</span> * @return the method result<a name="line.115"></a>
<span class="sourceLineNo">116</span> */<a name="line.116"></a>
<span class="sourceLineNo">117</span> private Long runUnixMXBeanMethod(String mBeanMethodName) {<a name="line.117"></a>
<span class="sourceLineNo">118</span> Object unixos;<a name="line.118"></a>
<span class="sourceLineNo">119</span> Class&lt;?&gt; classRef;<a name="line.119"></a>
<span class="sourceLineNo">120</span> Method mBeanMethod;<a name="line.120"></a>
<span class="sourceLineNo">121</span><a name="line.121"></a>
<span class="sourceLineNo">122</span> try {<a name="line.122"></a>
<span class="sourceLineNo">123</span> classRef = Class.forName("com.sun.management.UnixOperatingSystemMXBean");<a name="line.123"></a>
<span class="sourceLineNo">124</span> if (classRef.isInstance(osMbean)) {<a name="line.124"></a>
<span class="sourceLineNo">125</span> mBeanMethod = classRef.getMethod(mBeanMethodName);<a name="line.125"></a>
<span class="sourceLineNo">126</span> unixos = classRef.cast(osMbean);<a name="line.126"></a>
<span class="sourceLineNo">127</span> return (Long) mBeanMethod.invoke(unixos);<a name="line.127"></a>
<span class="sourceLineNo">128</span> }<a name="line.128"></a>
<span class="sourceLineNo">129</span> } catch (Exception e) {<a name="line.129"></a>
<span class="sourceLineNo">130</span> LOG.warn("Not able to load class or method for" +<a name="line.130"></a>
<span class="sourceLineNo">131</span> " com.sun.management.UnixOperatingSystemMXBean.", e);<a name="line.131"></a>
<span class="sourceLineNo">132</span> }<a name="line.132"></a>
<span class="sourceLineNo">133</span> return null;<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> /**<a name="line.136"></a>
<span class="sourceLineNo">137</span> * Get the number of opened filed descriptor for the runtime jvm.<a name="line.137"></a>
<span class="sourceLineNo">138</span> * If Oracle java, it will use the com.sun.management interfaces.<a name="line.138"></a>
<span class="sourceLineNo">139</span> * Otherwise, this methods implements it (linux only).<a name="line.139"></a>
<span class="sourceLineNo">140</span> *<a name="line.140"></a>
<span class="sourceLineNo">141</span> * @return number of open file descriptors for the jvm<a name="line.141"></a>
<span class="sourceLineNo">142</span> */<a name="line.142"></a>
<span class="sourceLineNo">143</span> public long getOpenFileDescriptorCount() {<a name="line.143"></a>
<span class="sourceLineNo">144</span> Long ofdc;<a name="line.144"></a>
<span class="sourceLineNo">145</span><a name="line.145"></a>
<span class="sourceLineNo">146</span> if (!ibmvendor) {<a name="line.146"></a>
<span class="sourceLineNo">147</span> ofdc = runUnixMXBeanMethod("getOpenFileDescriptorCount");<a name="line.147"></a>
<span class="sourceLineNo">148</span> return (ofdc != null ? ofdc : -1);<a name="line.148"></a>
<span class="sourceLineNo">149</span> }<a name="line.149"></a>
<span class="sourceLineNo">150</span> InputStream inputStream = null;<a name="line.150"></a>
<span class="sourceLineNo">151</span> InputStreamReader inputStreamReader = null;<a name="line.151"></a>
<span class="sourceLineNo">152</span> BufferedReader bufferedReader = null;<a name="line.152"></a>
<span class="sourceLineNo">153</span> try {<a name="line.153"></a>
<span class="sourceLineNo">154</span> //need to get the PID number of the process first<a name="line.154"></a>
<span class="sourceLineNo">155</span> RuntimeMXBean rtmbean = ManagementFactory.getRuntimeMXBean();<a name="line.155"></a>
<span class="sourceLineNo">156</span> String rtname = rtmbean.getName();<a name="line.156"></a>
<span class="sourceLineNo">157</span> String[] pidhost = rtname.split("@");<a name="line.157"></a>
<span class="sourceLineNo">158</span><a name="line.158"></a>
<span class="sourceLineNo">159</span> //using linux bash commands to retrieve info<a name="line.159"></a>
<span class="sourceLineNo">160</span> Process p = Runtime.getRuntime().exec(<a name="line.160"></a>
<span class="sourceLineNo">161</span> new String[]{"bash", "-c",<a name="line.161"></a>
<span class="sourceLineNo">162</span> "ls /proc/" + pidhost[0] + "/fdinfo | wc -l"});<a name="line.162"></a>
<span class="sourceLineNo">163</span> inputStream = p.getInputStream();<a name="line.163"></a>
<span class="sourceLineNo">164</span> inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);<a name="line.164"></a>
<span class="sourceLineNo">165</span> bufferedReader = new BufferedReader(inputStreamReader);<a name="line.165"></a>
<span class="sourceLineNo">166</span> String openFileDesCount;<a name="line.166"></a>
<span class="sourceLineNo">167</span> if ((openFileDesCount = bufferedReader.readLine()) != null) {<a name="line.167"></a>
<span class="sourceLineNo">168</span> return Long.parseLong(openFileDesCount);<a name="line.168"></a>
<span class="sourceLineNo">169</span> }<a name="line.169"></a>
<span class="sourceLineNo">170</span> } catch (IOException ie) {<a name="line.170"></a>
<span class="sourceLineNo">171</span> LOG.warn("Not able to get the number of open file descriptors", ie);<a name="line.171"></a>
<span class="sourceLineNo">172</span> } finally {<a name="line.172"></a>
<span class="sourceLineNo">173</span> if (bufferedReader != null) {<a name="line.173"></a>
<span class="sourceLineNo">174</span> try {<a name="line.174"></a>
<span class="sourceLineNo">175</span> bufferedReader.close();<a name="line.175"></a>
<span class="sourceLineNo">176</span> } catch (IOException e) {<a name="line.176"></a>
<span class="sourceLineNo">177</span> LOG.warn("Not able to close the BufferedReader", e);<a name="line.177"></a>
<span class="sourceLineNo">178</span> }<a name="line.178"></a>
<span class="sourceLineNo">179</span> }<a name="line.179"></a>
<span class="sourceLineNo">180</span> if (inputStreamReader != null) {<a name="line.180"></a>
<span class="sourceLineNo">181</span> try {<a name="line.181"></a>
<span class="sourceLineNo">182</span> inputStreamReader.close();<a name="line.182"></a>
<span class="sourceLineNo">183</span> } catch (IOException e) {<a name="line.183"></a>
<span class="sourceLineNo">184</span> LOG.warn("Not able to close the InputStreamReader", e);<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> if (inputStream != null) {<a name="line.187"></a>
<span class="sourceLineNo">188</span> try {<a name="line.188"></a>
<span class="sourceLineNo">189</span> inputStream.close();<a name="line.189"></a>
<span class="sourceLineNo">190</span> } catch (IOException e) {<a name="line.190"></a>
<span class="sourceLineNo">191</span> LOG.warn("Not able to close the InputStream", e);<a name="line.191"></a>
<span class="sourceLineNo">192</span> }<a name="line.192"></a>
<span class="sourceLineNo">193</span> }<a name="line.193"></a>
<span class="sourceLineNo">194</span> }<a name="line.194"></a>
<span class="sourceLineNo">195</span> return -1;<a name="line.195"></a>
<span class="sourceLineNo">196</span> }<a name="line.196"></a>
<span class="sourceLineNo">197</span><a name="line.197"></a>
<span class="sourceLineNo">198</span> /**<a name="line.198"></a>
<span class="sourceLineNo">199</span> * @see java.lang.management.OperatingSystemMXBean#getSystemLoadAverage<a name="line.199"></a>
<span class="sourceLineNo">200</span> */<a name="line.200"></a>
<span class="sourceLineNo">201</span> public double getSystemLoadAverage() {<a name="line.201"></a>
<span class="sourceLineNo">202</span> return osMbean.getSystemLoadAverage();<a name="line.202"></a>
<span class="sourceLineNo">203</span> }<a name="line.203"></a>
<span class="sourceLineNo">204</span><a name="line.204"></a>
<span class="sourceLineNo">205</span> /**<a name="line.205"></a>
<span class="sourceLineNo">206</span> * @return the physical free memory (not the JVM one, as it's not very useful as it depends on<a name="line.206"></a>
<span class="sourceLineNo">207</span> * the GC), but the one from the OS as it allows a little bit more to guess if the machine is<a name="line.207"></a>
<span class="sourceLineNo">208</span> * overloaded or not).<a name="line.208"></a>
<span class="sourceLineNo">209</span> */<a name="line.209"></a>
<span class="sourceLineNo">210</span> public long getFreeMemory() {<a name="line.210"></a>
<span class="sourceLineNo">211</span> if (ibmvendor) {<a name="line.211"></a>
<span class="sourceLineNo">212</span> return 0;<a name="line.212"></a>
<span class="sourceLineNo">213</span> }<a name="line.213"></a>
<span class="sourceLineNo">214</span><a name="line.214"></a>
<span class="sourceLineNo">215</span> Long r = runUnixMXBeanMethod("getFreePhysicalMemorySize");<a name="line.215"></a>
<span class="sourceLineNo">216</span> return (r != null ? r : -1);<a name="line.216"></a>
<span class="sourceLineNo">217</span> }<a name="line.217"></a>
<span class="sourceLineNo">218</span><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> * Workaround to get the current number of process running. Approach is the one described here:<a name="line.221"></a>
<span class="sourceLineNo">222</span> * http://stackoverflow.com/questions/54686/how-to-get-a-list-of-current-open-windows-process-with-java<a name="line.222"></a>
<span class="sourceLineNo">223</span> */<a name="line.223"></a>
<span class="sourceLineNo">224</span> @edu.umd.cs.findbugs.annotations.SuppressWarnings(<a name="line.224"></a>
<span class="sourceLineNo">225</span> value = "RV_DONT_JUST_NULL_CHECK_READLINE",<a name="line.225"></a>
<span class="sourceLineNo">226</span> justification = "used by testing")<a name="line.226"></a>
<span class="sourceLineNo">227</span> public int getNumberOfRunningProcess() {<a name="line.227"></a>
<span class="sourceLineNo">228</span> if (!isUnix()) {<a name="line.228"></a>
<span class="sourceLineNo">229</span> return 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> InputStream inputStream = null;<a name="line.232"></a>
<span class="sourceLineNo">233</span> InputStreamReader inputStreamReader = null;<a name="line.233"></a>
<span class="sourceLineNo">234</span> BufferedReader bufferedReader = null;<a name="line.234"></a>
<span class="sourceLineNo">235</span><a name="line.235"></a>
<span class="sourceLineNo">236</span> try {<a name="line.236"></a>
<span class="sourceLineNo">237</span> int count = 0;<a name="line.237"></a>
<span class="sourceLineNo">238</span> Process p = Runtime.getRuntime().exec("ps -e");<a name="line.238"></a>
<span class="sourceLineNo">239</span> inputStream = p.getInputStream();<a name="line.239"></a>
<span class="sourceLineNo">240</span> inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);<a name="line.240"></a>
<span class="sourceLineNo">241</span> bufferedReader = new BufferedReader(inputStreamReader);<a name="line.241"></a>
<span class="sourceLineNo">242</span> while (bufferedReader.readLine() != null) {<a name="line.242"></a>
<span class="sourceLineNo">243</span> count++;<a name="line.243"></a>
<span class="sourceLineNo">244</span> }<a name="line.244"></a>
<span class="sourceLineNo">245</span> return count - 1; // -1 because there is a headline<a name="line.245"></a>
<span class="sourceLineNo">246</span> } catch (IOException e) {<a name="line.246"></a>
<span class="sourceLineNo">247</span> return -1;<a name="line.247"></a>
<span class="sourceLineNo">248</span> } finally {<a name="line.248"></a>
<span class="sourceLineNo">249</span> if (bufferedReader != null) {<a name="line.249"></a>
<span class="sourceLineNo">250</span> try {<a name="line.250"></a>
<span class="sourceLineNo">251</span> bufferedReader.close();<a name="line.251"></a>
<span class="sourceLineNo">252</span> } catch (IOException e) {<a name="line.252"></a>
<span class="sourceLineNo">253</span> LOG.warn("Not able to close the BufferedReader", e);<a name="line.253"></a>
<span class="sourceLineNo">254</span> }<a name="line.254"></a>
<span class="sourceLineNo">255</span> }<a name="line.255"></a>
<span class="sourceLineNo">256</span> if (inputStreamReader != null) {<a name="line.256"></a>
<span class="sourceLineNo">257</span> try {<a name="line.257"></a>
<span class="sourceLineNo">258</span> inputStreamReader.close();<a name="line.258"></a>
<span class="sourceLineNo">259</span> } catch (IOException e) {<a name="line.259"></a>
<span class="sourceLineNo">260</span> LOG.warn("Not able to close the InputStreamReader", e);<a name="line.260"></a>
<span class="sourceLineNo">261</span> }<a name="line.261"></a>
<span class="sourceLineNo">262</span> }<a name="line.262"></a>
<span class="sourceLineNo">263</span> if (inputStream != null) {<a name="line.263"></a>
<span class="sourceLineNo">264</span> try {<a name="line.264"></a>
<span class="sourceLineNo">265</span> inputStream.close();<a name="line.265"></a>
<span class="sourceLineNo">266</span> } catch (IOException e) {<a name="line.266"></a>
<span class="sourceLineNo">267</span> LOG.warn("Not able to close the InputStream", e);<a name="line.267"></a>
<span class="sourceLineNo">268</span> }<a name="line.268"></a>
<span class="sourceLineNo">269</span> }<a name="line.269"></a>
<span class="sourceLineNo">270</span> }<a name="line.270"></a>
<span class="sourceLineNo">271</span> }<a name="line.271"></a>
<span class="sourceLineNo">272</span><a name="line.272"></a>
<span class="sourceLineNo">273</span> /**<a name="line.273"></a>
<span class="sourceLineNo">274</span> * Get the number of the maximum file descriptors the system can use.<a name="line.274"></a>
<span class="sourceLineNo">275</span> * If Oracle java, it will use the com.sun.management interfaces.<a name="line.275"></a>
<span class="sourceLineNo">276</span> * Otherwise, this methods implements it (linux only).<a name="line.276"></a>
<span class="sourceLineNo">277</span> *<a name="line.277"></a>
<span class="sourceLineNo">278</span> * @return max number of file descriptors the operating system can use.<a name="line.278"></a>
<span class="sourceLineNo">279</span> */<a name="line.279"></a>
<span class="sourceLineNo">280</span> public long getMaxFileDescriptorCount() {<a name="line.280"></a>
<span class="sourceLineNo">281</span> Long mfdc;<a name="line.281"></a>
<span class="sourceLineNo">282</span> if (!ibmvendor) {<a name="line.282"></a>
<span class="sourceLineNo">283</span> mfdc = runUnixMXBeanMethod("getMaxFileDescriptorCount");<a name="line.283"></a>
<span class="sourceLineNo">284</span> return (mfdc != null ? mfdc : -1);<a name="line.284"></a>
<span class="sourceLineNo">285</span> }<a name="line.285"></a>
<span class="sourceLineNo">286</span> InputStream in = null;<a name="line.286"></a>
<span class="sourceLineNo">287</span> BufferedReader output = null;<a name="line.287"></a>
<span class="sourceLineNo">288</span> try {<a name="line.288"></a>
<span class="sourceLineNo">289</span> //using linux bash commands to retrieve info<a name="line.289"></a>
<span class="sourceLineNo">290</span> Process p = Runtime.getRuntime().exec(new String[]{"bash", "-c", "ulimit -n"});<a name="line.290"></a>
<span class="sourceLineNo">291</span> in = p.getInputStream();<a name="line.291"></a>
<span class="sourceLineNo">292</span> output = new BufferedReader(new InputStreamReader(in, StandardCharsets.UTF_8));<a name="line.292"></a>
<span class="sourceLineNo">293</span> String maxFileDesCount;<a name="line.293"></a>
<span class="sourceLineNo">294</span> if ((maxFileDesCount = output.readLine()) != null) {<a name="line.294"></a>
<span class="sourceLineNo">295</span> return Long.parseLong(maxFileDesCount);<a name="line.295"></a>
<span class="sourceLineNo">296</span> }<a name="line.296"></a>
<span class="sourceLineNo">297</span> } catch (IOException ie) {<a name="line.297"></a>
<span class="sourceLineNo">298</span> LOG.warn("Not able to get the max number of file descriptors", ie);<a name="line.298"></a>
<span class="sourceLineNo">299</span> } finally {<a name="line.299"></a>
<span class="sourceLineNo">300</span> if (output != null) {<a name="line.300"></a>
<span class="sourceLineNo">301</span> try {<a name="line.301"></a>
<span class="sourceLineNo">302</span> output.close();<a name="line.302"></a>
<span class="sourceLineNo">303</span> } catch (IOException e) {<a name="line.303"></a>
<span class="sourceLineNo">304</span> LOG.warn("Not able to close the reader", e);<a name="line.304"></a>
<span class="sourceLineNo">305</span> }<a name="line.305"></a>
<span class="sourceLineNo">306</span> }<a name="line.306"></a>
<span class="sourceLineNo">307</span> if (in != null) {<a name="line.307"></a>
<span class="sourceLineNo">308</span> try {<a name="line.308"></a>
<span class="sourceLineNo">309</span> in.close();<a name="line.309"></a>
<span class="sourceLineNo">310</span> } catch (IOException e) {<a name="line.310"></a>
<span class="sourceLineNo">311</span> LOG.warn("Not able to close the InputStream", e);<a name="line.311"></a>
<span class="sourceLineNo">312</span> }<a name="line.312"></a>
<span class="sourceLineNo">313</span> }<a name="line.313"></a>
<span class="sourceLineNo">314</span> }<a name="line.314"></a>
<span class="sourceLineNo">315</span> return -1;<a name="line.315"></a>
<span class="sourceLineNo">316</span> }<a name="line.316"></a>
<span class="sourceLineNo">317</span>}<a name="line.317"></a>
</pre>
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