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From "Benjamin Mahler (JIRA)" <>
Subject [jira] [Created] (MESOS-429) Hadoop MesosScheduler has a deadlock.
Date Mon, 08 Apr 2013 18:59:16 GMT
Benjamin Mahler created MESOS-429:

             Summary: Hadoop MesosScheduler has a deadlock.
                 Key: MESOS-429
             Project: Mesos
          Issue Type: Bug
            Reporter: Benjamin Mahler
            Assignee: Benjamin Mahler
            Priority: Blocker

This was found with the help of Brenden Matthews.

JobTracker.heartbeat (synchronized) calls MesosScheduler.assignTasks (synchronized)
MesosScheduler.resourceOffers (synchronized) calls into JobTracker.getJobStatus (synchronized).

Thread 24558: (state = BLOCKED)
 - org.apache.hadoop.mapred.JobTracker.getJobStatus(java.util.Collection, boolean) @bci=0,
line=4592 (Interpreted frame)
 - org.apache.hadoop.mapred.JobTracker.jobsToComplete() @bci=11, line=4157 (Interpreted frame)
 - org.apache.hadoop.mapred.MesosScheduler.resourceOffers(org.apache.mesos.SchedulerDriver,
java.util.List) @bci=9, line=273 (Compiled frame)

Thread 24575: (state = BLOCKED)
 - org.apache.hadoop.mapred.MesosScheduler.assignTasks(org.apache.hadoop.mapreduce.server.jobtracker.TaskTracker)
@bci=25, line=219 (Compiled frame)
 - org.apache.hadoop.mapred.JobTracker.heartbeat(org.apache.hadoop.mapred.TaskTrackerStatus,
boolean, boolean, boolean, short) @bci=507, line=2951 (Compiled frame)

The simplest fix for now would be to unsynchronize the Scheduler interface implementations.
As a result, when we have to modify the state of MesosScheduler inside those methods, we need
to do so in a synchronized block. So long as we don't invoke the JobTracker methods from these
synchronized blocks, we won't have a deadlock. We can clean this up later, if a cleaner abstraction
is needed.

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