[ https://issues.apache.org/jira/browse/HIVE-74?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
dhruba borthakur updated HIVE-74: --------------------------------- Attachment: hiveCombineSplit.patch Allow Hive to use CombineInputFormat. This will not compile against 0.17 and 0.19 because CombineInputFormat is available only in 0.20 (HADOOP-4565). > 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: 0.2.0 > > Attachments: hiveCombineSplit.patch, hiveCombineSplit.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.