| <!DOCTYPE HTML> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc (17) --> |
| <title>JVM (Apache HBase 4.0.0-alpha-1-SNAPSHOT API)</title> |
| <meta name="viewport" content="width=device-width, initial-scale=1"> |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> |
| <meta name="description" content="declaration: package: org.apache.hadoop.hbase.util, class: JVM"> |
| <meta name="generator" content="javadoc/ClassWriterImpl"> |
| <link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style"> |
| <link rel="stylesheet" type="text/css" href="../../../../../script-dir/jquery-ui.min.css" title="Style"> |
| <link rel="stylesheet" type="text/css" href="../../../../../jquery-ui.overrides.css" title="Style"> |
| <script type="text/javascript" src="../../../../../script.js"></script> |
| <script type="text/javascript" src="../../../../../script-dir/jquery-3.6.1.min.js"></script> |
| <script type="text/javascript" src="../../../../../script-dir/jquery-ui.min.js"></script> |
| </head> |
| <body class="class-declaration-page"> |
| <script type="text/javascript">var evenRowColor = "even-row-color"; |
| var oddRowColor = "odd-row-color"; |
| var tableTab = "table-tab"; |
| var activeTableTab = "active-table-tab"; |
| var pathtoroot = "../../../../../"; |
| loadScripts(document, 'script');</script> |
| <noscript> |
| <div>JavaScript is disabled on your browser.</div> |
| </noscript> |
| <div class="flex-box"> |
| <header role="banner" class="flex-header"> |
| <nav role="navigation"> |
| <!-- ========= START OF TOP NAVBAR ======= --> |
| <div class="top-nav" id="navbar-top"> |
| <div class="skip-nav"><a href="#skip-navbar-top" title="Skip navigation links">Skip navigation links</a></div> |
| <ul id="navbar-top-firstrow" class="nav-list" title="Navigation"> |
| <li><a href="../../../../../index.html">Overview</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="nav-bar-cell1-rev">Class</li> |
| <li><a href="class-use/JVM.html">Use</a></li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../help-doc.html#class">Help</a></li> |
| </ul> |
| </div> |
| <div class="sub-nav"> |
| <div> |
| <ul class="sub-nav-list"> |
| <li>Summary: </li> |
| <li>Nested | </li> |
| <li><a href="#field-summary">Field</a> | </li> |
| <li><a href="#constructor-summary">Constr</a> | </li> |
| <li><a href="#method-summary">Method</a></li> |
| </ul> |
| <ul class="sub-nav-list"> |
| <li>Detail: </li> |
| <li><a href="#field-detail">Field</a> | </li> |
| <li><a href="#constructor-detail">Constr</a> | </li> |
| <li><a href="#method-detail">Method</a></li> |
| </ul> |
| </div> |
| <div class="nav-list-search"><label for="search-input">SEARCH:</label> |
| <input type="text" id="search-input" value="search" disabled="disabled"> |
| <input type="reset" id="reset-button" value="reset" disabled="disabled"> |
| </div> |
| </div> |
| <!-- ========= END OF TOP NAVBAR ========= --> |
| <span class="skip-nav" id="skip-navbar-top"></span></nav> |
| </header> |
| <div class="flex-content"> |
| <main role="main"> |
| <!-- ======== START OF CLASS DATA ======== --> |
| <div class="header"> |
| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.hadoop.hbase.util</a></div> |
| <h1 title="Class JVM" class="title">Class JVM</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance">org.apache.hadoop.hbase.util.JVM</div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <hr> |
| <div class="type-signature"><span class="annotations">@Private |
| </span><span class="modifiers">public class </span><span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-41">JVM</a></span> |
| <span class="extends-implements">extends <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></span></div> |
| <div class="block">This class is a wrapper for the implementation of com.sun.management.UnixOperatingSystemMXBean It |
| will decide to use the sun api or its own implementation depending on the runtime (vendor) used.</div> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- =========== FIELD SUMMARY =========== --> |
| <li> |
| <section class="field-summary" id="field-summary"> |
| <h2>Field Summary</h2> |
| <div class="caption"><span>Fields</span></div> |
| <div class="summary-table three-column-summary"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Field</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code>private static final boolean</code></div> |
| <div class="col-second even-row-color"><code><a href="#aarch64" class="member-name-link">aarch64</a></code></div> |
| <div class="col-last even-row-color"> </div> |
| <div class="col-first odd-row-color"><code>private static final boolean</code></div> |
| <div class="col-second odd-row-color"><code><a href="#amd64" class="member-name-link">amd64</a></code></div> |
| <div class="col-last odd-row-color"> </div> |
| <div class="col-first even-row-color"><code>private static final boolean</code></div> |
| <div class="col-second even-row-color"><code><a href="#ibmvendor" class="member-name-link">ibmvendor</a></code></div> |
| <div class="col-last even-row-color"> </div> |
| <div class="col-first odd-row-color"><code>private static final int</code></div> |
| <div class="col-second odd-row-color"><code><a href="#JVM_SPEC_VERSION" class="member-name-link">JVM_SPEC_VERSION</a></code></div> |
| <div class="col-last odd-row-color"> |
| <div class="block">The Integer represent of JVM_SPEC_VERSION, for the JVM version comparison.</div> |
| </div> |
| <div class="col-first even-row-color"><code>private static final <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div> |
| <div class="col-second even-row-color"><code><a href="#JVM_SPEC_VERSION_STRING" class="member-name-link">JVM_SPEC_VERSION_STRING</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">The raw String of java specification version.</div> |
| </div> |
| <div class="col-first odd-row-color"><code>private static final <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div> |
| <div class="col-second odd-row-color"><code><a href="#JVMVersion" class="member-name-link">JVMVersion</a></code></div> |
| <div class="col-last odd-row-color"> </div> |
| <div class="col-first even-row-color"><code>private static final boolean</code></div> |
| <div class="col-second even-row-color"><code><a href="#linux" class="member-name-link">linux</a></code></div> |
| <div class="col-last even-row-color"> </div> |
| <div class="col-first odd-row-color"><code>private static final org.slf4j.Logger</code></div> |
| <div class="col-second odd-row-color"><code><a href="#LOG" class="member-name-link">LOG</a></code></div> |
| <div class="col-last odd-row-color"> </div> |
| <div class="col-first even-row-color"><code>private <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.management/java/lang/management/OperatingSystemMXBean.html" title="class or interface in java.lang.management" class="external-link">OperatingSystemMXBean</a></code></div> |
| <div class="col-second even-row-color"><code><a href="#osMbean" class="member-name-link">osMbean</a></code></div> |
| <div class="col-last even-row-color"> </div> |
| <div class="col-first odd-row-color"><code>private static final boolean</code></div> |
| <div class="col-second odd-row-color"><code><a href="#windows" class="member-name-link">windows</a></code></div> |
| <div class="col-last odd-row-color"> </div> |
| </div> |
| </section> |
| </li> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <li> |
| <section class="constructor-summary" id="constructor-summary"> |
| <h2>Constructor Summary</h2> |
| <div class="caption"><span>Constructors</span></div> |
| <div class="summary-table two-column-summary"> |
| <div class="table-header col-first">Constructor</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">JVM</a>()</code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Constructor.</div> |
| </div> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div> |
| <div id="method-summary-table.tabpanel" role="tabpanel"> |
| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>long</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getFreeMemory()" class="member-name-link">getFreeMemory</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Return the physical free memory (not the JVM one, as it's not very useful as it depends on the |
| GC), but the one from the OS as it allows a little bit more to guess if the machine is |
| overloaded or not).</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static int</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#getJVMSpecVersion()" class="member-name-link">getJVMSpecVersion</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>long</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getMaxFileDescriptorCount()" class="member-name-link">getMaxFileDescriptorCount</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Get the number of the maximum file descriptors the system can use.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>int</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getNumberOfRunningProcess()" class="member-name-link">getNumberOfRunningProcess</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Workaround to get the current number of process running.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>long</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getOpenFileDescriptorCount()" class="member-name-link">getOpenFileDescriptorCount</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Get the number of opened filed descriptor for the runtime jvm.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>double</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getSystemLoadAverage()" class="member-name-link">getSystemLoadAverage</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Get the system load average</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isAarch64()" class="member-name-link">isAarch64</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Check if the arch is aarch64;</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isAmd64()" class="member-name-link">isAmd64</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Check if the arch is amd64;</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isGZIPOutputStreamFinishBroken()" class="member-name-link">isGZIPOutputStreamFinishBroken</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Check if the finish() method of GZIPOutputStream is broken</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isLinux()" class="member-name-link">isLinux</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Check if the OS is linux.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static boolean</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#isUnix()" class="member-name-link">isUnix</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Check if the OS is unix.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>private <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Long.html" title="class or interface in java.lang" class="external-link">Long</a></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#runUnixMXBeanMethod(java.lang.String)" class="member-name-link">runUnixMXBeanMethod</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a> mBeanMethodName)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Load the implementation of UnixOperatingSystemMXBean for Oracle jvm and runs the desired |
| method.</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <li> |
| <section class="field-details" id="field-detail"> |
| <h2>Field Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="LOG"> |
| <h3>LOG</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type">org.slf4j.Logger</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-43">LOG</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="osMbean"> |
| <h3>osMbean</h3> |
| <div class="member-signature"><span class="modifiers">private</span> <span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.management/java/lang/management/OperatingSystemMXBean.html" title="class or interface in java.lang.management" class="external-link">OperatingSystemMXBean</a></span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-44">osMbean</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="ibmvendor"> |
| <h3>ibmvendor</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-46">ibmvendor</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="windows"> |
| <h3>windows</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-49">windows</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="linux"> |
| <h3>linux</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-51">linux</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="amd64"> |
| <h3>amd64</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-53">amd64</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="aarch64"> |
| <h3>aarch64</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-55">aarch64</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="JVMVersion"> |
| <h3>JVMVersion</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-58">JVMVersion</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="JVM_SPEC_VERSION_STRING"> |
| <h3>JVM_SPEC_VERSION_STRING</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-63">JVM_SPEC_VERSION_STRING</a></span></div> |
| <div class="block">The raw String of java specification version. "1.8" for java8, "9","10"... for Java 9, 10...</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="JVM_SPEC_VERSION"> |
| <h3>JVM_SPEC_VERSION</h3> |
| <div class="member-signature"><span class="modifiers">private static final</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-70">JVM_SPEC_VERSION</a></span></div> |
| <div class="block">The Integer represent of JVM_SPEC_VERSION, for the JVM version comparison. Java 8, 9, 10 ... |
| will be noted as 8, 9 10 ...</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor-detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>()"> |
| <h3>JVM</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-77">JVM</a></span>()</div> |
| <div class="block">Constructor. Get the running Operating System instance</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="isUnix()"> |
| <h3>isUnix</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-85">isUnix</a></span>()</div> |
| <div class="block">Check if the OS is unix.</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>whether this is unix or not.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="isLinux()"> |
| <h3>isLinux</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-96">isLinux</a></span>()</div> |
| <div class="block">Check if the OS is linux.</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>whether this is linux or not.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="isAmd64()"> |
| <h3>isAmd64</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-104">isAmd64</a></span>()</div> |
| <div class="block">Check if the arch is amd64;</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>whether this is amd64 or not.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="isAarch64()"> |
| <h3>isAarch64</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-112">isAarch64</a></span>()</div> |
| <div class="block">Check if the arch is aarch64;</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>whether this is aarch64 or not.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="isGZIPOutputStreamFinishBroken()"> |
| <h3>isGZIPOutputStreamFinishBroken</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">boolean</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-120">isGZIPOutputStreamFinishBroken</a></span>()</div> |
| <div class="block">Check if the finish() method of GZIPOutputStream is broken</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>whether GZIPOutputStream.finish() is broken.</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getJVMSpecVersion()"> |
| <h3>getJVMSpecVersion</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-124">getJVMSpecVersion</a></span>()</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="runUnixMXBeanMethod(java.lang.String)"> |
| <h3>runUnixMXBeanMethod</h3> |
| <div class="member-signature"><span class="modifiers">private</span> <span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Long.html" title="class or interface in java.lang" class="external-link">Long</a></span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-134">runUnixMXBeanMethod</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a> mBeanMethodName)</span></div> |
| <div class="block">Load the implementation of UnixOperatingSystemMXBean for Oracle jvm and runs the desired |
| method.</div> |
| <dl class="notes"> |
| <dt>Parameters:</dt> |
| <dd><code>mBeanMethodName</code> - : method to run from the interface UnixOperatingSystemMXBean</dd> |
| <dt>Returns:</dt> |
| <dd>the method result</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getOpenFileDescriptorCount()"> |
| <h3>getOpenFileDescriptorCount</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">long</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-159">getOpenFileDescriptorCount</a></span>()</div> |
| <div class="block">Get the number of opened filed descriptor for the runtime jvm. If Oracle java, it will use the |
| com.sun.management interfaces. Otherwise, this methods implements it (linux only).</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>number of open file descriptors for the jvm</dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getSystemLoadAverage()"> |
| <h3>getSystemLoadAverage</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">double</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-216">getSystemLoadAverage</a></span>()</div> |
| <div class="block">Get the system load average</div> |
| <dl class="notes"> |
| <dt>See Also:</dt> |
| <dd> |
| <ul class="see-list-long"> |
| <li><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.management/java/lang/management/OperatingSystemMXBean.html#getSystemLoadAverage()" title="class or interface in java.lang.management" class="external-link"><code>OperatingSystemMXBean.getSystemLoadAverage()</code></a></li> |
| </ul> |
| </dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getFreeMemory()"> |
| <h3>getFreeMemory</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">long</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-225">getFreeMemory</a></span>()</div> |
| <div class="block">Return the physical free memory (not the JVM one, as it's not very useful as it depends on the |
| GC), but the one from the OS as it allows a little bit more to guess if the machine is |
| overloaded or not).</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getNumberOfRunningProcess()"> |
| <h3>getNumberOfRunningProcess</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">int</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-238">getNumberOfRunningProcess</a></span>()</div> |
| <div class="block">Workaround to get the current number of process running. Approach is the one described here: |
| http://stackoverflow.com/questions/54686/how-to-get-a-list-of-current-open-windows-process-with-java</div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getMaxFileDescriptorCount()"> |
| <h3>getMaxFileDescriptorCount</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type">long</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/util/JVM.html#line-291">getMaxFileDescriptorCount</a></span>()</div> |
| <div class="block">Get the number of the maximum file descriptors the system can use. If Oracle java, it will use |
| the com.sun.management interfaces. Otherwise, this methods implements it (linux only).</div> |
| <dl class="notes"> |
| <dt>Returns:</dt> |
| <dd>max number of file descriptors the operating system can use.</dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <!-- ========= END OF CLASS DATA ========= --> |
| </main> |
| <footer role="contentinfo"> |
| <hr> |
| <p class="legal-copy"><small>Copyright © 2007–2020 <a href="https://www.apache.org/">The Apache Software Foundation</a>. All rights reserved.</small></p> |
| </footer> |
| </div> |
| </div> |
| </body> |
| </html> |
