Mailing-List: contact hadoop-dev-help@lucene.apache.org; run by ezmlm
Precedence: bulk
Reply-To: hadoop-dev@lucene.apache.org
Message-ID: <5240203.1191627890569.JavaMail.jira@brutus>
Date: Fri, 5 Oct 2007 16:44:50 -0700 (PDT)
From: "Michael Bieniosek (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-2001) Deadlock in jobtracker
In-Reply-To: <30272114.1191627170781.JavaMail.jira@brutus>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


    [ https://issues.apache.org/jira/browse/HADOOP-2001?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12532798 ] 

Michael Bieniosek commented on HADOOP-2001:
-------------------------------------------

I could submit a quick fix patch that unmarks JobTracker.finalizeJob synchronized, but I don't really know if that would break other things, or if it could miss other deadlock paths.

Anybody else know more about this code?


> Deadlock in jobtracker
> ----------------------
>
>                 Key: HADOOP-2001
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2001
>             Project: Hadoop
>          Issue Type: Bug
>    Affects Versions: 0.14.0
>            Reporter: Michael Bieniosek
>            Priority: Critical
>
> My jobtracker deadlocked; the output from kill -QUIT is:
> Found one Java-level deadlock:
> =============================
> "IPC Server handler 2 on 10001":
>   waiting to lock monitor 0x0813724c (object 0xd5175488, a org.apache.hadoop.mapred.JobInProgress),
>   which is held by "SocketListener0-1"
> "SocketListener0-1":
>   waiting to lock monitor 0x081146d4 (object 0xd24d9c50, a org.apache.hadoop.mapred.JobTracker),
>   which is held by "IPC Server handler 2 on 10001"
> Java stack information for the threads listed above:
> ===================================================
> "IPC Server handler 2 on 10001":
>         at org.apache.hadoop.mapred.JobInProgress.updateTaskStatus(JobInProgress.java:367)
>         - waiting to lock <0xd5175488> (a org.apache.hadoop.mapred.JobInProgress)
>         at org.apache.hadoop.mapred.JobTracker.updateTaskStatuses(JobTracker.java:1719)
>         at org.apache.hadoop.mapred.JobTracker.processHeartbeat(JobTracker.java:1240)
>         - locked <0xd24d9c50> (a org.apache.hadoop.mapred.JobTracker)
>         at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:1116)
>         - locked <0xd24d9c50> (a org.apache.hadoop.mapred.JobTracker)
>         at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
>         at java.lang.reflect.Method.invoke(Unknown Source)
>         at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:340)
>         at org.apache.hadoop.ipc.Server$Handler.run(Server.java:566)
> "SocketListener0-1":
>         at org.apache.hadoop.mapred.JobTracker.finalizeJob(JobTracker.java:907)
>         - waiting to lock <0xd24d9c50> (a org.apache.hadoop.mapred.JobTracker)
>         at org.apache.hadoop.mapred.JobInProgress.garbageCollect(JobInProgress.java:1059)
>         - locked <0xd5175488> (a org.apache.hadoop.mapred.JobInProgress)
>         at org.apache.hadoop.mapred.JobInProgress.kill(JobInProgress.java:891)
>         - locked <0xd5175488> (a org.apache.hadoop.mapred.JobInProgress)
>         at org.apache.hadoop.mapred.jobdetails_jsp._jspService(jobdetails_jsp.java:158)
>         at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
>         at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
>         at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:427)
>         at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:475)
>         at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
>         at org.mortbay.http.HttpContext.handle(HttpContext.java:1565)
>         at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:635)
>         at org.mortbay.http.HttpContext.handle(HttpContext.java:1517)
>         at org.mortbay.http.HttpServer.service(HttpServer.java:954)
>         at org.mortbay.http.HttpConnection.service(HttpConnection.java:814)
>         at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:981)
>         at org.mortbay.http.HttpConnection.handle(HttpConnection.java:831)
>         at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:244)
>         at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:357)
>         at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:534)
> Found 1 deadlock.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.