[MAPREDUCE-73] Deadlock in JobTracker initJobs

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Duplicate

Environment

Hadoop 0.19.1 in a test environment with 2 Task Trackers

• Assignee: Unassigned
• Reporter: Dave Latham
• Created: 04/May/09 22:48
• Updated: 09/Nov/09 04:34
• Resolved: 09/Nov/09 04:34

Description

Found one Java-level deadlock:
=============================
"SocketListener0-26":
waiting to lock monitor 0x08ed5ce4 (object 0x567924c0, a org.apache.hadoop.mapred.JobTracker),
which is held by "IPC Server handler 1 on 9001"
"IPC Server handler 1 on 9001":
waiting to lock monitor 0x08f7da88 (object 0x5744f5b8, a org.apache.hadoop.mapred.JobInProgress),
which is held by "initJobs"
"initJobs":
waiting to lock monitor 0x08ed5ce4 (object 0x567924c0, a org.apache.hadoop.mapred.JobTracker),
which is held by "IPC Server handler 1 on 9001"

Java stack information for the threads listed above:
===================================================
"SocketListener0-26":
at org.apache.hadoop.mapred.JobTracker.getClusterStatus(JobTracker.java:2313)

• waiting to lock <0x567924c0> (a org.apache.hadoop.mapred.JobTracker)
  at org.apache.hadoop.mapred.jobtracker_jsp._jspService(jobtracker_jsp.java:104)
  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$PoolThread.run(ThreadPool.java:534)
  "IPC Server handler 1 on 9001":
  at org.apache.hadoop.mapred.JobInProgress.obtainTaskCleanupTask(JobInProgress.java:935)
• waiting to lock <0x5744f5b8> (a org.apache.hadoop.mapred.JobInProgress)
  at org.apache.hadoop.mapred.JobTracker.getSetupAndCleanupTasks(JobTracker.java:2167)
• locked <0x56795708> (a java.util.TreeMap)
• locked <0x567924c0> (a org.apache.hadoop.mapred.JobTracker)
  at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:1902)
• locked <0x567924c0> (a org.apache.hadoop.mapred.JobTracker)
  at sun.reflect.GeneratedMethodAccessor3278.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  at java.lang.reflect.Method.invoke(Method.java:597)
  at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:481)
  at org.apache.hadoop.ipc.Server$Handler.run(Server.java:894)
  "initJobs":
  at org.apache.hadoop.mapred.JobTracker.finalizeJob(JobTracker.java:1539)
• waiting to lock <0x567924c0> (a org.apache.hadoop.mapred.JobTracker)
  at org.apache.hadoop.mapred.JobInProgress.garbageCollect(JobInProgress.java:2320)
• locked <0x5744f5b8> (a org.apache.hadoop.mapred.JobInProgress)
  at org.apache.hadoop.mapred.JobInProgress.terminateJob(JobInProgress.java:2004)
• locked <0x5744f5b8> (a org.apache.hadoop.mapred.JobInProgress)
  at org.apache.hadoop.mapred.JobInProgress.initTasks(JobInProgress.java:472)
• locked <0x575b7ec8> (a org.apache.hadoop.mapred.JobInProgress$JobInitKillStatus)
• locked <0x5744f5b8> (a org.apache.hadoop.mapred.JobInProgress)
  at org.apache.hadoop.mapred.EagerTaskInitializationListener$JobInitThread.run(EagerTaskInitializationListener.java:55)

Found 1 deadlock.