FAQ
Hi,

I am using hadoop version 0.20.2

While running query "select count(*) from table;" on Hive,i am getting this
error

FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.
exec.MapRedTask

Error in task tracker logs says :-

Error: java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
at
org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2683)
at
org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2605)


How to debug and correct it??


Vaibhav Negi

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  • Vaibhav negi at Sep 30, 2010 at 11:54 am
    Hello,

    I am stuck at it. Please help

    Regards
    Vaibhav Negi

    On Wed, Sep 29, 2010 at 5:30 PM, vaibhav negi wrote:

    Hi,

    I am using hadoop version 0.20.2

    While running query "select count(*) from table;" on Hive,i am getting this
    error

    FAILED: Execution Error, return code 2 from org.apache.hadoop.hive.ql.
    exec.MapRedTask

    Error in task tracker logs says :-

    Error: java.lang.NullPointerException
    at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
    at
    org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2683)
    at
    org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2605)


    How to debug and correct it??


    Vaibhav Negi

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postedSep 29, '10 at 12:01p
activeSep 30, '10 at 11:54a
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