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Posted to xmlrpc-auto@ws.apache.org by "Alan Burlison (JIRA)" <xm...@ws.apache.org> on 2009/04/28 16:53:30 UTC
[jira] Issue Comment Edited: (XMLRPC-168) XML-RPC server deadlocks
under heavy load
[ https://issues.apache.org/jira/browse/XMLRPC-168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12703603#action_12703603 ]
Alan Burlison edited comment on XMLRPC-168 at 4/28/09 7:52 AM:
---------------------------------------------------------------
Found this issue when testing https://issues.apache.org/jira/browse/XMLRPC-167
was (Author: alanbur):
Found this issue when testing
> XML-RPC server deadlocks under heavy load
> -----------------------------------------
>
> Key: XMLRPC-168
> URL: https://issues.apache.org/jira/browse/XMLRPC-168
> Project: XML-RPC
> Issue Type: Bug
> Components: Source
> Affects Versions: 3.1.2
> Environment: Soalris
> Reporter: Alan Burlison
>
> When running a XML-RPC server under heavy load, it eventually deadlocks inside the thread pool that manages the 'worker' threads which handle the individual XML-RPC requests - the classes involved are org.apache.xmlrpc.util.ThreadPool and org.apache.xmlrpc.util.ThreadPool$Poolable. jstack on the hung process shows:
> ----------
> Found one Java-level deadlock:
> =============================
> "XML-RPC-13":
> waiting to lock monitor 0x08d10bec (object 0xbb6959c0, a org.apache.xmlrpc.util.ThreadPool),
> which is held by "XML-RPC Weblistener"
> "XML-RPC Weblistener":
> waiting to lock monitor 0x08d1186c (object 0xbd2ed340, a org.apache.xmlrpc.util.ThreadPool$Poolable$1),
> which is held by "XML-RPC-2"
> "XML-RPC-2":
> waiting to lock monitor 0x08d112f4 (object 0xbd2ed570, a org.apache.xmlrpc.util.ThreadPool$Poolable),
> which is held by "XML-RPC Weblistener"
> Java stack information for the threads listed above:
> ===================================================
> "XML-RPC-13":
> at org.apache.xmlrpc.util.ThreadPool.repool(Unknown Source)
> - waiting to lock <0xbb6959c0> (a org.apache.xmlrpc.util.ThreadPool)
> at org.apache.xmlrpc.util.ThreadPool$Poolable$1.run(Unknown Source)
> "XML-RPC Weblistener":
> at org.apache.xmlrpc.util.ThreadPool$Poolable.start(Unknown Source)
> - waiting to lock <0xbd2ed340> (a org.apache.xmlrpc.util.ThreadPool$Poolable$1)
> - locked <0xbd2ed570> (a org.apache.xmlrpc.util.ThreadPool$Poolable)
> at org.apache.xmlrpc.util.ThreadPool.startTask(Unknown Source)
> - locked <0xbb6959c0> (a org.apache.xmlrpc.util.ThreadPool)
> at org.apache.xmlrpc.webserver.WebServer.run(Unknown Source)
> at java.lang.Thread.run(Thread.java:619)
> "XML-RPC-2":
> at org.apache.xmlrpc.util.ThreadPool$Poolable.isShuttingDown(Unknown Source)
> - waiting to lock <0xbd2ed570> (a org.apache.xmlrpc.util.ThreadPool$Poolable)
> at org.apache.xmlrpc.util.ThreadPool$Poolable.access$000(Unknown Source)
> at org.apache.xmlrpc.util.ThreadPool$Poolable$1.run(Unknown Source)
> - locked <0xbd2ed340> (a org.apache.xmlrpc.util.ThreadPool$Poolable$1)
> Found 1 deadlock.
> ----------
> And another slight variant on the above:
> ----------
> Found one Java-level deadlock:
> =============================
> "XML-RPC-9":
> waiting to lock monitor 0x0850dfb4 (object 0xf973c5a8, a org.apache.xmlrpc.util.ThreadPool),
> which is held by "XML-RPC Weblistener"
> "XML-RPC Weblistener":
> waiting to lock monitor 0x0854cda4 (object 0xf9730398, a org.apache.xmlrpc.util.ThreadPool$Poolable$1),
> which is held by "XML-RPC-3"
> "XML-RPC-3":
> waiting to lock monitor 0x0850df50 (object 0xf973fa38, a org.apache.xmlrpc.util.ThreadPool$Poolable),
> which is held by "XML-RPC Weblistener"
> Java stack information for the threads listed above:
> ===================================================
> "XML-RPC-9":
> at org.apache.xmlrpc.util.ThreadPool.repool(ThreadPool.java:147)
> - waiting to lock <0xf973c5a8> (a org.apache.xmlrpc.util.ThreadPool)
> at org.apache.xmlrpc.util.ThreadPool$Poolable$1.run(ThreadPool.java:71)
> "XML-RPC Weblistener":
> at org.apache.xmlrpc.util.ThreadPool$Poolable.start(ThreadPool.java:118)
> - waiting to lock <0xf9730398> (a org.apache.xmlrpc.util.ThreadPool$Poolable$1)
> - locked <0xf973fa38> (a org.apache.xmlrpc.util.ThreadPool$Poolable)
> at org.apache.xmlrpc.util.ThreadPool.startTask(ThreadPool.java:179)
> - locked <0xf973c5a8> (a org.apache.xmlrpc.util.ThreadPool)
> at org.apache.xmlrpc.webserver.WebServer.run(WebServer.java:338)
> at java.lang.Thread.run(Thread.java:619)
> "XML-RPC-3":
> at org.apache.xmlrpc.util.ThreadPool$Poolable.getTask(ThreadPool.java:108)
> - waiting to lock <0xf973fa38> (a org.apache.xmlrpc.util.ThreadPool$Poolable)
> at org.apache.xmlrpc.util.ThreadPool$Poolable$1.run(ThreadPool.java:60)
> - locked <0xf9730398> (a org.apache.xmlrpc.util.ThreadPool$Poolable$1)
> Found 1 deadlock.
> ----------
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