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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3039) Runtime exceptions not killing job
Date Tue, 25 Mar 2008 06:55:33 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3039?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Devaraj Das updated HADOOP-3039:
--------------------------------

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

I just committed this. Thanks, Amareshwari!

> Runtime exceptions not killing job
> ----------------------------------
>
>                 Key: HADOOP-3039
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3039
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.16.0
>            Reporter: Amareshwari Sriramadasu
>            Assignee: Amareshwari Sriramadasu
>            Priority: Blocker
>             Fix For: 0.16.2, 0.17.0
>
>         Attachments: patch-3039.txt
>
>
> If a map or reduce task threw a runtime exception such as an NPE, the task, and ultimately
the job, would fail in short order. In 0.16.0, when the reduce tasks started throwing NPEs,
the tasks just hung. Eventually they timed out and were killed. But task has to get killed
immediately if it throws NPE.
> Thread dump shows:
> "DestroyJavaVM" prio=10 tid=0x0805f800 nid=0x6b5a waiting on condition [0x00000000..0xbfffcc90]
>    java.lang.Thread.State: RUNNABLE
> "Thread-12" prio=10 tid=0x083f1400 nid=0x6b87 in Object.wait() [0xa2f37000..0xa2f37eb0]
>    java.lang.Thread.State: TIMED_WAITING (on object monitor)
> 	at java.lang.Object.wait(Native Method)
> 	- waiting on <0xa3af62a0> (a java.util.LinkedList)
> 	at org.apache.hadoop.dfs.DFSClient$DFSOutputStream$DataStreamer.run(DFSClient.java:1680)
> 	- locked <0xa3af62a0> (a java.util.LinkedList)
> "Comm thread for task_200803181240_0001_r_000000_0" daemon prio=10 tid=0x0841f000 nid=0x6b6f
waiting on condition [0xa307c000..0xa307c130]
>    java.lang.Thread.State: TIMED_WAITING (sleeping)
> 	at java.lang.Thread.sleep(Native Method)
> 	at org.apache.hadoop.mapred.Task$1.run(Task.java:283)
> 	at java.lang.Thread.run(Unknown Source)
> "org.apache.hadoop.dfs.DFSClient$LeaseChecker@edf3f6" daemon prio=10 tid=0x083fc400 nid=0x6b6d
waiting on condition [0xa30cd000..0xa30cd1b0]
>    java.lang.Thread.State: TIMED_WAITING (sleeping)
> 	at java.lang.Thread.sleep(Native Method)
> 	at org.apache.hadoop.dfs.DFSClient$LeaseChecker.run(DFSClient.java:626)
> 	at java.lang.Thread.run(Unknown Source)
> "IPC Client connection to localhost/127.0.0.1:9000" daemon prio=10 tid=0x083f6800 nid=0x6b6c
in Object.wait() [0xa311d000..0xa311e030]
>    java.lang.Thread.State: WAITING (on object monitor)
> 	at java.lang.Object.wait(Native Method)
> 	- waiting on <0xa4ac0860> (a org.apache.hadoop.ipc.Client$Connection)
> 	at java.lang.Object.wait(Object.java:485)
> 	at org.apache.hadoop.ipc.Client$Connection.waitForWork(Client.java:247)
> 	- locked <0xa4ac0860> (a org.apache.hadoop.ipc.Client$Connection)
> 	at org.apache.hadoop.ipc.Client$Connection.run(Client.java:286)
> It looks like Task is waiting for DataStreamer thread to get closed. 
> When I did  streamer.setDaemon(true), the behavior was fine.

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