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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.