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From "Paul Yang (JIRA)" <>
Subject [jira] Created: (HIVE-1032) Better Error Messages for Execution Errors
Date Thu, 07 Jan 2010 03:24:56 GMT
Better Error Messages for Execution Errors

                 Key: HIVE-1032
             Project: Hadoop Hive
          Issue Type: New Feature
          Components: Query Processor
            Reporter: Paul Yang
            Assignee: Paul Yang

Three common errors that occur during execution are:

1. Map-side group-by causing an out of memory exception due to large aggregation hash tables

2. ScriptOperator failing due to the user's script throwing an exception or otherwise returning
a non-zero error code

3. Incorrectly specifying the join order of small and large tables, causing the large table
to be loaded into memory and producing an out of memory exception.

These errors are typically discovered by manually examining the error log files of the failed
task. This task proposes to create a feature that would automatically read the error logs
and output a probable cause and solution to the command line.

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