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dhruba borthakur edited comment on HIVE-74 at 4/20/09 8:43 PM: --------------------------------------------------------------- This combines multiple blocks from files into a single split. All files of the same table are part of a single pool. was (Author: dhruba): This combines multiple blocks from files into a single split. > Hive can use CombineFileInputFormat for when the input are many small files > --------------------------------------------------------------------------- > > Key: HIVE-74 > URL: https://issues.apache.org/jira/browse/HIVE-74 > Project: Hadoop Hive > Issue Type: Improvement > Components: Query Processor > Reporter: dhruba borthakur > Assignee: dhruba borthakur > Fix For: 0.4.0 > > Attachments: hiveCombineSplit.patch, hiveCombineSplit.patch, > hiveCombineSplit2.patch > > > There are cases when the input to a Hive job are thousands of small files. In > this case, there is a mapper for each file. Most of the overhead for spawning > all these mappers can be avoided if Hive used CombineFileInputFormat > introduced via HADOOP-4565 -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.