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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.util;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.lang.management.ManagementFactory;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.lang.reflect.InvocationTargetException;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.lang.reflect.Method;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.nio.ByteBuffer;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import javax.management.JMException;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import javax.management.MBeanServer;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import javax.management.MalformedObjectNameException;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import javax.management.ObjectName;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.yetus.audience.InterfaceStability;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.slf4j.Logger;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.slf4j.LoggerFactory;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span><a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.apache.hbase.thirdparty.io.netty.buffer.ByteBufAllocatorMetric;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.apache.hbase.thirdparty.io.netty.buffer.ByteBufAllocatorMetricProvider;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span>import org.apache.hbase.thirdparty.io.netty.buffer.PooledByteBufAllocator;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>import org.apache.hbase.thirdparty.io.netty.util.internal.PlatformDependent;<a name="line.37"></a> |
| <span class="sourceLineNo">038</span><a name="line.38"></a> |
| <span class="sourceLineNo">039</span>/**<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * Utilities for interacting with and monitoring DirectByteBuffer allocations.<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> */<a name="line.41"></a> |
| <span class="sourceLineNo">042</span>@InterfaceAudience.Private<a name="line.42"></a> |
| <span class="sourceLineNo">043</span>@InterfaceStability.Evolving<a name="line.43"></a> |
| <span class="sourceLineNo">044</span>public class DirectMemoryUtils {<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> private static final Logger LOG = LoggerFactory.getLogger(DirectMemoryUtils.class);<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> private static final String MEMORY_USED = "MemoryUsed";<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> private static final MBeanServer BEAN_SERVER;<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> private static final ObjectName NIO_DIRECT_POOL;<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> private static final boolean HAS_MEMORY_USED_ATTRIBUTE;<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> private static final long MAX_DIRECT_MEMORY = PlatformDependent.estimateMaxDirectMemory();<a name="line.50"></a> |
| <span class="sourceLineNo">051</span><a name="line.51"></a> |
| <span class="sourceLineNo">052</span> static {<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> // initialize singletons. Only maintain a reference to the MBeanServer if<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> // we're able to consume it -- hence convoluted logic.<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> ObjectName n = null;<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> MBeanServer s = null;<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> Object a = null;<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> try {<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> n = new ObjectName("java.nio:type=BufferPool,name=direct");<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> } catch (MalformedObjectNameException e) {<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> LOG.warn("Unable to initialize ObjectName for DirectByteBuffer allocations.");<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> } finally {<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> NIO_DIRECT_POOL = n;<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> }<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> if (NIO_DIRECT_POOL != null) {<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> s = ManagementFactory.getPlatformMBeanServer();<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> }<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> BEAN_SERVER = s;<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> if (BEAN_SERVER != null) {<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> try {<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> a = BEAN_SERVER.getAttribute(NIO_DIRECT_POOL, MEMORY_USED);<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> } catch (JMException e) {<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> LOG.debug("Failed to retrieve nio.BufferPool direct MemoryUsed attribute: " + e);<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> HAS_MEMORY_USED_ATTRIBUTE = a != null;<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> }<a name="line.77"></a> |
| <span class="sourceLineNo">078</span><a name="line.78"></a> |
| <span class="sourceLineNo">079</span> /** Returns the direct memory limit of the current progress */<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> public static long getDirectMemorySize() {<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> return MAX_DIRECT_MEMORY;<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> }<a name="line.82"></a> |
| <span class="sourceLineNo">083</span><a name="line.83"></a> |
| <span class="sourceLineNo">084</span> /** Returns the current amount of direct memory used. */<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> public static long getDirectMemoryUsage() {<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> if (BEAN_SERVER == null || NIO_DIRECT_POOL == null || !HAS_MEMORY_USED_ATTRIBUTE) return 0;<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> try {<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> Long value = (Long) BEAN_SERVER.getAttribute(NIO_DIRECT_POOL, MEMORY_USED);<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> return value == null ? 0 : value;<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> } catch (JMException e) {<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> // should print further diagnostic information?<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> return 0;<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> }<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> }<a name="line.94"></a> |
| <span class="sourceLineNo">095</span><a name="line.95"></a> |
| <span class="sourceLineNo">096</span> /** Returns the current amount of direct memory used by netty module. */<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> public static long getNettyDirectMemoryUsage() {<a name="line.97"></a> |
| <span class="sourceLineNo">098</span><a name="line.98"></a> |
| <span class="sourceLineNo">099</span> ByteBufAllocatorMetric metric =<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> ((ByteBufAllocatorMetricProvider) PooledByteBufAllocator.DEFAULT).metric();<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> return metric.usedDirectMemory();<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> }<a name="line.102"></a> |
| <span class="sourceLineNo">103</span><a name="line.103"></a> |
| <span class="sourceLineNo">104</span> /**<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> * DirectByteBuffers are garbage collected by using a phantom reference and a reference queue.<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> * Every once a while, the JVM checks the reference queue and cleans the DirectByteBuffers.<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> * However, as this doesn't happen immediately after discarding all references to a<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> * DirectByteBuffer, it's easy to OutOfMemoryError yourself using DirectByteBuffers. This function<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> * explicitly calls the Cleaner method of a DirectByteBuffer. The DirectByteBuffer that will be<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> * "cleaned". Utilizes reflection.<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> */<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> public static void destroyDirectByteBuffer(ByteBuffer toBeDestroyed)<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> throws IllegalArgumentException, IllegalAccessException, InvocationTargetException,<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> SecurityException, NoSuchMethodException {<a name="line.114"></a> |
| <span class="sourceLineNo">115</span><a name="line.115"></a> |
| <span class="sourceLineNo">116</span> Preconditions.checkArgument(toBeDestroyed.isDirect(), "toBeDestroyed isn't direct!");<a name="line.116"></a> |
| <span class="sourceLineNo">117</span><a name="line.117"></a> |
| <span class="sourceLineNo">118</span> Method cleanerMethod = toBeDestroyed.getClass().getMethod("cleaner");<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> cleanerMethod.setAccessible(true);<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> Object cleaner = cleanerMethod.invoke(toBeDestroyed);<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> Method cleanMethod = cleaner.getClass().getMethod("clean");<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> cleanMethod.setAccessible(true);<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> cleanMethod.invoke(cleaner);<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> }<a name="line.124"></a> |
| <span class="sourceLineNo">125</span>}<a name="line.125"></a> |
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