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Hive >> mail # user >> Hive query started map task being killed during execution


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Hive query started map task being killed during execution
Hi All,

I am running a hive query which does insert into a table.
What I noticed from the symptom it looks like it got to do with some
settings but  I am not able to figure out what settings.

When I submit the query it starts 2130 map tasks in the job and 150 of them
completes fine without any error and then next batch of 75 gets killed and
all of them after that gets killed.
While I submit a similar query based on smaller table its starts around
only 135 map tasks and it runs till completion without any error and does
the insert into appropriate table.

I don't find any obvious error messages in any of the tasks log apart form
this:
./hadoop-0.20-mapreduce/userlogs/job_201303080834_0001/attempt_201303080834_0001_m_001636_0/syslog:2013-03-08
08:54:06,910 INFO orapache.hadoop.hive.ql.exec.MapOperator:
DESERIALIZE_ERRORS:0
./hadoop-0.20-mapreduce/userlogs/job_201303080834_0001/attempt_201303080834_0001_m_001646_0/syslog:2013-03-08
08:41:06,060 INFO orapache.hadoop.hive.ql.exec.MapOperator:
DESERIALIZE_ERRORS:0
./hadoop-0.20-mapreduce/userlogs/job_201303080834_0001/attempt_201303080834_0001_m_001646_0/syslog:2013-03-08
08:46:54,390 ERROR o.apache.hadoop.hive.ql.stats.jdbc.JDBCStatsPublisher:
Error during instantiating JDBC driver org.apache.derby.jdbc.EmbeddedDriver.
./hadoop-0.20-mapreduce/userlogs/job_201303080834_0001/attempt_201303080834_0001_m_001646_0/syslog:2013-03-08
08:46:54,394 ERROR o.apache.hadoop.hive.ql.exec.FileSinkOperator:
StatsPublishing error: cannot connect to database

Please suggest if I need to set anything in Hive when I invoke this query.
The query that runs successfully has lot less rows compared to on that
fails.

Thanks,
DK