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From "Maxime Brugidou (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-2766) Hive freezes and takes 100% cpu when missing an HDFS block
Date Tue, 31 Jan 2012 09:14:10 GMT
Hive freezes and takes 100% cpu when missing an HDFS block
----------------------------------------------------------

                 Key: HIVE-2766
                 URL: https://issues.apache.org/jira/browse/HIVE-2766
             Project: Hive
          Issue Type: Bug
          Components: CLI, Query Processor
         Environment: Reproduced on Cloudera 3
            Reporter: Maxime Brugidou


When a block is corrupt or missing from HDFS (due to the failure of multiple nodes), Hive
jobs hang mysteriously at the beginning (without starting the M/R job):

{code}
Launching Job 2 out of 4
Number of reduce tasks not specified. Estimated from input data size: 2
In order to change the average load for a reducer (in bytes):
  set hive.exec.reducers.bytes.per.reducer=<number>
In order to limit the maximum number of reducers:
  set hive.exec.reducers.max=<number>
In order to set a constant number of reducers:
  set mapred.reduce.tasks=<number>
{code}

The java process takes 100% of 1 CPU, and never stops, i had to kill manually all my hive
jobs.

It would be nice if the processes could fail with an appropriate exception rather than hanging.

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