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Posted to dev@pig.apache.org by "Alan Gates (JIRA)" <ji...@apache.org> on 2011/02/01 19:58:29 UTC
[jira] Commented: (PIG-1825) ability to turn off the write ahead
log for pig's HBaseStorage
[ https://issues.apache.org/jira/browse/PIG-1825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12989330#comment-12989330 ]
Alan Gates commented on PIG-1825:
---------------------------------
Dmitriy, is this something we should check in? You seemed to indicate that this was no longer necessary after we moved to HBase 0.89 or above.
> ability to turn off the write ahead log for pig's HBaseStorage
> --------------------------------------------------------------
>
> Key: PIG-1825
> URL: https://issues.apache.org/jira/browse/PIG-1825
> Project: Pig
> Issue Type: Improvement
> Affects Versions: 0.8.0
> Reporter: Corbin Hoenes
> Priority: Minor
> Fix For: 0.8.0
>
> Attachments: HBaseStorage_noWAL.patch
>
>
> Added an option to allow a caller of HBaseStorage to turn off the WriteAheadLog feature while doing bulk loads into hbase.
> From the performance tuning wikipage: http://wiki.apache.org/hadoop/PerformanceTuning
> "To speed up the inserts in a non critical job (like an import job), you can use Put.writeToWAL(false) to bypass writing to the write ahead log."
> We've tested this on HBase 0.20.6 and it helps dramatically.
> The -noWAL options is passed in just like other options for hbase storage:
> STORE myalias INTO 'MyTable' USING org.apache.pig.backend.hadoop.hbase.HBaseStorage('mycolumnfamily:field1 mycolumnfamily:field2','-noWAL');
> This would be my first patch so please educate me with any steps I need to do.
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