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
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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