617 lines
32 KiB
HTML
617 lines
32 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|
<!--
|
|
| Generated by Apache Maven Doxia at 2023-03-25
|
|
| Rendered using Apache Maven Stylus Skin 1.5
|
|
-->
|
|
<html xmlns="http://www.w3.org/1999/xhtml">
|
|
<head>
|
|
<title>Apache Hadoop 3.4.0-SNAPSHOT – Async Profiler Servlet for Hadoop</title>
|
|
<style type="text/css" media="all">
|
|
@import url("./css/maven-base.css");
|
|
@import url("./css/maven-theme.css");
|
|
@import url("./css/site.css");
|
|
</style>
|
|
<link rel="stylesheet" href="./css/print.css" type="text/css" media="print" />
|
|
<meta name="Date-Revision-yyyymmdd" content="20230325" />
|
|
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
|
|
</head>
|
|
<body class="composite">
|
|
<div id="banner">
|
|
<a href="http://hadoop.apache.org/" id="bannerLeft">
|
|
<img src="http://hadoop.apache.org/images/hadoop-logo.jpg" alt="" />
|
|
</a>
|
|
<a href="http://www.apache.org/" id="bannerRight">
|
|
<img src="http://www.apache.org/images/asf_logo_wide.png" alt="" />
|
|
</a>
|
|
<div class="clear">
|
|
<hr/>
|
|
</div>
|
|
</div>
|
|
<div id="breadcrumbs">
|
|
|
|
<div class="xright"> <a href="http://wiki.apache.org/hadoop" class="externalLink">Wiki</a>
|
|
|
|
|
<a href="https://gitbox.apache.org/repos/asf/hadoop.git" class="externalLink">git</a>
|
|
|
|
|
<a href="http://hadoop.apache.org/" class="externalLink">Apache Hadoop</a>
|
|
|
|
| Last Published: 2023-03-25
|
|
| Version: 3.4.0-SNAPSHOT
|
|
</div>
|
|
<div class="clear">
|
|
<hr/>
|
|
</div>
|
|
</div>
|
|
<div id="leftColumn">
|
|
<div id="navcolumn">
|
|
|
|
<h5>General</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../index.html">Overview</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/SingleCluster.html">Single Node Setup</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/ClusterSetup.html">Cluster Setup</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/CommandsManual.html">Commands Reference</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/FileSystemShell.html">FileSystem Shell</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/Compatibility.html">Compatibility Specification</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/DownstreamDev.html">Downstream Developer's Guide</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/AdminCompatibilityGuide.html">Admin Compatibility Guide</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/InterfaceClassification.html">Interface Classification</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/filesystem/index.html">FileSystem Specification</a>
|
|
</li>
|
|
</ul>
|
|
<h5>Common</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/CLIMiniCluster.html">CLI Mini Cluster</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/FairCallQueue.html">Fair Call Queue</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/NativeLibraries.html">Native Libraries</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/Superusers.html">Proxy User</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/RackAwareness.html">Rack Awareness</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/SecureMode.html">Secure Mode</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/ServiceLevelAuth.html">Service Level Authorization</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/HttpAuthentication.html">HTTP Authentication</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/CredentialProviderAPI.html">Credential Provider API</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-kms/index.html">Hadoop KMS</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/Tracing.html">Tracing</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/UnixShellGuide.html">Unix Shell Guide</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/registry/index.html">Registry</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/AsyncProfilerServlet.html">Async Profiler</a>
|
|
</li>
|
|
</ul>
|
|
<h5>HDFS</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsDesign.html">Architecture</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsUserGuide.html">User Guide</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HDFSCommands.html">Commands Reference</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.html">NameNode HA With QJM</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithNFS.html">NameNode HA With NFS</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/ObserverNameNode.html">Observer NameNode</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/Federation.html">Federation</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/ViewFs.html">ViewFs</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/ViewFsOverloadScheme.html">ViewFsOverloadScheme</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsSnapshots.html">Snapshots</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsEditsViewer.html">Edits Viewer</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsImageViewer.html">Image Viewer</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsPermissionsGuide.html">Permissions and HDFS</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsQuotaAdminGuide.html">Quotas and HDFS</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/LibHdfs.html">libhdfs (C API)</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/WebHDFS.html">WebHDFS (REST API)</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-hdfs-httpfs/index.html">HttpFS</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/ShortCircuitLocalReads.html">Short Circuit Local Reads</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/CentralizedCacheManagement.html">Centralized Cache Management</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsNfsGateway.html">NFS Gateway</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsRollingUpgrade.html">Rolling Upgrade</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/ExtendedAttributes.html">Extended Attributes</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/TransparentEncryption.html">Transparent Encryption</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsMultihoming.html">Multihoming</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html">Storage Policies</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/MemoryStorage.html">Memory Storage Support</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/SLGUserGuide.html">Synthetic Load Generator</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HDFSErasureCoding.html">Erasure Coding</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HDFSDiskbalancer.html">Disk Balancer</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsUpgradeDomain.html">Upgrade Domain</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsDataNodeAdminGuide.html">DataNode Admin</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs-rbf/HDFSRouterFederation.html">Router Federation</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/HdfsProvidedStorage.html">Provided Storage</a>
|
|
</li>
|
|
</ul>
|
|
<h5>MapReduce</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduceTutorial.html">Tutorial</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapredCommands.html">Commands Reference</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapReduce_Compatibility_Hadoop1_Hadoop2.html">Compatibility with 1.x</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/EncryptedShuffle.html">Encrypted Shuffle</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/PluggableShuffleAndPluggableSort.html">Pluggable Shuffle/Sort</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/DistributedCacheDeploy.html">Distributed Cache Deploy</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/SharedCacheSupport.html">Support for YARN Shared Cache</a>
|
|
</li>
|
|
</ul>
|
|
<h5>MapReduce REST APIs</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/MapredAppMasterRest.html">MR Application Master</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-hs/HistoryServerRest.html">MR History Server</a>
|
|
</li>
|
|
</ul>
|
|
<h5>YARN</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/YARN.html">Architecture</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/YarnCommands.html">Commands Reference</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/CapacityScheduler.html">Capacity Scheduler</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/FairScheduler.html">Fair Scheduler</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/ResourceManagerRestart.html">ResourceManager Restart</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/ResourceManagerHA.html">ResourceManager HA</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/ResourceModel.html">Resource Model</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/NodeLabel.html">Node Labels</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/NodeAttributes.html">Node Attributes</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/WebApplicationProxy.html">Web Application Proxy</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServer.html">Timeline Server</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html">Timeline Service V.2</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/WritingYarnApplications.html">Writing YARN Applications</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/YarnApplicationSecurity.html">YARN Application Security</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/NodeManager.html">NodeManager</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/DockerContainers.html">Running Applications in Docker Containers</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/RuncContainers.html">Running Applications in runC Containers</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/NodeManagerCgroups.html">Using CGroups</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/SecureContainer.html">Secure Containers</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/ReservationSystem.html">Reservation System</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/GracefulDecommission.html">Graceful Decommission</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/OpportunisticContainers.html">Opportunistic Containers</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/Federation.html">YARN Federation</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/SharedCache.html">Shared Cache</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/UsingGpus.html">Using GPU</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/UsingFPGA.html">Using FPGA</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/PlacementConstraints.html">Placement Constraints</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/YarnUI2.html">YARN UI2</a>
|
|
</li>
|
|
</ul>
|
|
<h5>YARN REST APIs</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/WebServicesIntro.html">Introduction</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html">Resource Manager</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/NodeManagerRest.html">Node Manager</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServer.html#Timeline_Server_REST_API_v1">Timeline Server</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html#Timeline_Service_v.2_REST_API">Timeline Service V.2</a>
|
|
</li>
|
|
</ul>
|
|
<h5>YARN Service</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/Overview.html">Overview</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/QuickStart.html">QuickStart</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/Concepts.html">Concepts</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/YarnServiceAPI.html">Yarn Service API</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/ServiceDiscovery.html">Service Discovery</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-site/yarn-service/SystemServices.html">System Services</a>
|
|
</li>
|
|
</ul>
|
|
<h5>Hadoop Compatible File Systems</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-aliyun/tools/hadoop-aliyun/index.html">Aliyun OSS</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-aws/tools/hadoop-aws/index.html">Amazon S3</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-azure/index.html">Azure Blob Storage</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-azure-datalake/index.html">Azure Data Lake Storage</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-cos/cloud-storage/index.html">Tencent COS</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-huaweicloud/cloud-storage/index.html">Huaweicloud OBS</a>
|
|
</li>
|
|
</ul>
|
|
<h5>Auth</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-auth/index.html">Overview</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-auth/Examples.html">Examples</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-auth/Configuration.html">Configuration</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-auth/BuildingIt.html">Building</a>
|
|
</li>
|
|
</ul>
|
|
<h5>Tools</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-streaming/HadoopStreaming.html">Hadoop Streaming</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-archives/HadoopArchives.html">Hadoop Archives</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-archive-logs/HadoopArchiveLogs.html">Hadoop Archive Logs</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-distcp/DistCp.html">DistCp</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-federation-balance/HDFSFederationBalance.html">HDFS Federation Balance</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-gridmix/GridMix.html">GridMix</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-rumen/Rumen.html">Rumen</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-resourceestimator/ResourceEstimator.html">Resource Estimator Service</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-sls/SchedulerLoadSimulator.html">Scheduler Load Simulator</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/Benchmarking.html">Hadoop Benchmarking</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-dynamometer/Dynamometer.html">Dynamometer</a>
|
|
</li>
|
|
</ul>
|
|
<h5>Reference</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/release/">Changelog and Release Notes</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../api/index.html">Java API docs</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/UnixShellAPI.html">Unix Shell API</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/Metrics.html">Metrics</a>
|
|
</li>
|
|
</ul>
|
|
<h5>Configuration</h5>
|
|
<ul>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/core-default.xml">core-default.xml</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs/hdfs-default.xml">hdfs-default.xml</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-hdfs-rbf/hdfs-rbf-default.xml">hdfs-rbf-default.xml</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-mapreduce-client/hadoop-mapreduce-client-core/mapred-default.xml">mapred-default.xml</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-yarn/hadoop-yarn-common/yarn-default.xml">yarn-default.xml</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-kms/kms-default.html">kms-default.xml</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-hdfs-httpfs/httpfs-default.html">httpfs-default.xml</a>
|
|
</li>
|
|
<li class="none">
|
|
<a href="../../hadoop-project-dist/hadoop-common/DeprecatedProperties.html">Deprecated Properties</a>
|
|
</li>
|
|
</ul>
|
|
<a href="http://maven.apache.org/" title="Built by Maven" class="poweredBy">
|
|
<img alt="Built by Maven" src="./images/logos/maven-feather.png"/>
|
|
</a>
|
|
|
|
</div>
|
|
</div>
|
|
<div id="bodyColumn">
|
|
<div id="contentBox">
|
|
<!---
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License. See accompanying LICENSE file.
|
|
-->
|
|
<h1>Async Profiler Servlet for Hadoop</h1>
|
|
<ul>
|
|
<li><a href="#Purpose">Purpose</a></li>
|
|
<li><a href="#Prerequisites">Prerequisites</a></li>
|
|
<li><a href="#Usage">Usage</a></li></ul>
|
|
<section>
|
|
<h2><a name="Purpose"></a>Purpose</h2>
|
|
<p>This document describes how to configure and use async profiler with Hadoop applications. Async profiler is a low overhead sampling profiler for Java that does not suffer from Safepoint bias problem. It features HotSpot-specific APIs to collect stack traces and to track memory allocations. The profiler works with OpenJDK, Oracle JDK and other Java runtimes based on the HotSpot JVM.</p>
|
|
<p>Hadoop profiler servlet supports Async Profiler major versions 1.x and 2.x.</p></section><section>
|
|
<h2><a name="Prerequisites"></a>Prerequisites</h2>
|
|
<p>Make sure Hadoop is installed, configured and setup correctly. For more information see:</p>
|
|
<ul>
|
|
|
|
<li><a href="./SingleCluster.html">Single Node Setup</a> for first-time users.</li>
|
|
<li><a href="./ClusterSetup.html">Cluster Setup</a> for large, distributed clusters.</li>
|
|
</ul>
|
|
<p>Go to <a class="externalLink" href="https://github.com/jvm-profiling-tools/async-profiler">https://github.com/jvm-profiling-tools/async-profiler</a>, download a release appropriate for your platform, and install on every cluster host.</p>
|
|
<p>Set <code>ASYNC_PROFILER_HOME</code> in the environment (put it in hadoop-env.sh) to the root directory of the async-profiler install location, or pass it on the Hadoop daemon’s command line as a system property as <code>-Dasync.profiler.home=/path/to/async-profiler</code>.</p></section><section>
|
|
<h2><a name="Usage"></a>Usage</h2>
|
|
<p>Once the prerequisites have been satisfied, access to the async-profiler is available by using Namenode or ResourceManager UI.</p>
|
|
<p>Following options from async-profiler can be specified as query paramater. * <code>-e event</code> profiling event: cpu|alloc|lock|cache-misses etc. * <code>-d duration</code> run profiling for ‘duration’ seconds (integer) * <code>-i interval</code> sampling interval in nanoseconds (long) * <code>-j jstackdepth</code> maximum Java stack depth (integer) * <code>-b bufsize</code> frame buffer size (long) * <code>-t</code> profile different threads separately * <code>-s</code> simple class names instead of FQN * <code>-o fmt[,fmt...]</code> output format: summary|traces|flat|collapsed|svg|tree|jfr|html * <code>--width px</code> SVG width pixels (integer) * <code>--height px</code> SVG frame height pixels (integer) * <code>--minwidth px</code> skip frames smaller than px (double) * <code>--reverse</code> generate stack-reversed FlameGraph / Call tree</p>
|
|
<p>Example: If Namenode http address is localhost:9870, and ResourceManager http address is localhost:8088, ProfileServlet running with async-profiler setup can be accessed with <a class="externalLink" href="http://localhost:9870/prof">http://localhost:9870/prof</a> and <a class="externalLink" href="http://localhost:8088/prof">http://localhost:8088/prof</a> for Namenode and ResourceManager processes respectively.</p>
|
|
<p>Diving deep into some params:</p>
|
|
<ul>
|
|
|
|
<li>To collect 10 second CPU profile of current process (returns FlameGraph svg)</li>
|
|
<li><code>curl http://localhost:9870/prof</code> (FlameGraph svg for Namenode)</li>
|
|
<li><code>curl http://localhost:8088/prof</code> (FlameGraph svg for ResourceManager)</li>
|
|
<li>To collect 10 second CPU profile of pid 12345 (returns FlameGraph svg)</li>
|
|
<li><code>curl http://localhost:9870/prof?pid=12345</code> (For instance, provide pid of Datanode here)</li>
|
|
<li>To collect 30 second CPU profile of pid 12345 (returns FlameGraph svg)</li>
|
|
<li><code>curl http://localhost:9870/prof?pid=12345&duration=30</code></li>
|
|
<li>To collect 1 minute CPU profile of current process and output in tree format (html)</li>
|
|
<li><code>curl http://localhost:9870/prof?output=tree&amp;duration=60</code></li>
|
|
<li>To collect 10 second heap allocation profile of current process (returns FlameGraph svg)</li>
|
|
<li><code>curl http://localhost:9870/prof?event=alloc</code></li>
|
|
<li>To collect lock contention profile of current process (returns FlameGraph svg)</li>
|
|
<li><code>curl http://localhost:9870/prof?event=lock</code></li>
|
|
</ul>
|
|
<p>The following event types are supported by async-profiler. Use the ‘event’ parameter to specify. Default is ‘cpu’. Not all operating systems will support all types.</p>
|
|
<p>Perf events:</p>
|
|
<ul>
|
|
|
|
<li>cpu</li>
|
|
<li>page-faults</li>
|
|
<li>context-switches</li>
|
|
<li>cycles</li>
|
|
<li>instructions</li>
|
|
<li>cache-references</li>
|
|
<li>cache-misses</li>
|
|
<li>branches</li>
|
|
<li>branch-misses</li>
|
|
<li>bus-cycles</li>
|
|
<li>L1-dcache-load-misses</li>
|
|
<li>LLC-load-misses</li>
|
|
<li>dTLB-load-misses</li>
|
|
</ul>
|
|
<p>Java events:</p>
|
|
<ul>
|
|
|
|
<li>alloc</li>
|
|
<li>lock</li>
|
|
</ul>
|
|
<p>The following output formats are supported. Use the ‘output’ parameter to specify. Default is ‘flamegraph’.</p>
|
|
<p>Output formats:</p>
|
|
<ul>
|
|
|
|
<li>summary: A dump of basic profiling statistics.</li>
|
|
<li>traces: Call traces.</li>
|
|
<li>flat: Flat profile (top N hot methods).</li>
|
|
<li>collapsed: Collapsed call traces in the format used by FlameGraph script. This is a collection of call stacks, where each line is a semicolon separated list of frames followed by a counter.</li>
|
|
<li>svg: FlameGraph in SVG format.</li>
|
|
<li>tree: Call tree in HTML format.</li>
|
|
<li>jfr: Call traces in Java Flight Recorder format.</li>
|
|
</ul>
|
|
<p>The ‘duration’ parameter specifies how long to collect trace data before generating output, specified in seconds. The default is 10 seconds.</p></section>
|
|
</div>
|
|
</div>
|
|
<div class="clear">
|
|
<hr/>
|
|
</div>
|
|
<div id="footer">
|
|
<div class="xright">
|
|
© 2008-2023
|
|
Apache Software Foundation
|
|
|
|
- <a href="http://maven.apache.org/privacy-policy.html">Privacy Policy</a>.
|
|
Apache Maven, Maven, Apache, the Apache feather logo, and the Apache Maven project logos are trademarks of The Apache Software Foundation.
|
|
</div>
|
|
<div class="clear">
|
|
<hr/>
|
|
</div>
|
|
</div>
|
|
</body>
|
|
</html>
|