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https://issues.apache.org/jira/browse/MAPREDUCE-4062?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Graves updated MAPREDUCE-4062:
-------------------------------------
Status: Patch Available (was: Open)
> AM Launcher thread can hang forever
> -----------------------------------
>
> Key: MAPREDUCE-4062
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4062
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.2
> Reporter: Thomas Graves
> Assignee: Thomas Graves
> Attachments: MAPREDUCE-4062-branch-0.23.patch, MAPREDUCE-4062.patch,
> MAPREDUCE-4062.patch
>
>
> We saw an instance where the RM stopped launch Application masters. We found
> that the launcher thread was hung because something weird/bad happened to the
> NM node. Currently there is only 1 launcher thread (jira 4061 to fix that).
> We need this to not happen. Even once we increase the number of threads to
> > 1 if that many nodes go bad the RM would be stuck. Note that this was
> stuck like this for approximately 9 hours.
> Stack trace on hung AM launcher:
> "pool-1-thread-1" prio=10 tid=0x000000004343e800 nid=0x3a4c in Object.wait()
> [0x000000004fad2000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> at java.lang.Object.wait(Object.java:485)
> at org.apache.hadoop.ipc.Client.call(Client.java:1076)
> - locked <0x00002aab05a4f3f0> (a org.apache.hadoop.ipc.Client$Call)
> at
> org.apache.hadoop.yarn.ipc.ProtoOverHadoopRpcEngine$Invoker.invoke(ProtoOverHadoopRpcEngine.java:135)
> at $Proxy76.startContainer(Unknown Source)
> at
> org.apache.hadoop.yarn.api.impl.pb.client.ContainerManagerPBClientImpl.startContainer(ContainerManagerPBClientImpl.java:87)
> at
> org.apache.hadoop.yarn.server.resourcemanager.amlauncher.AMLauncher.launch(AMLauncher.java:118)
> at
> org.apache.hadoop.yarn.server.resourcemanager.amlauncher.AMLauncher.run(AMLauncher.java:265)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:619)
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