[
https://issues.apache.org/jira/browse/TEPHRA-299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16819766#comment-16819766
]
Poorna Chandra commented on TEPHRA-299:
---------------------------------------
+1 Great idea on translating the deletes to puts on the client side. Thanks!
> Executing a large batch delete is very slow
> -------------------------------------------
>
> Key: TEPHRA-299
> URL: https://issues.apache.org/jira/browse/TEPHRA-299
> Project: Tephra
> Issue Type: Bug
> Affects Versions: 0.15.0-incubating
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Priority: Major
> Attachments: 299-DOES-NOT_WORK.txt, 299-client-v2.txt,
> 299-client-v3.txt, 299-client.txt
>
>
> I noticed that batch deletes are quire slow. In the profiler I found that
> almost all of the time is spent in
> org.apache.hadoop.hbase.regionserver.wal.FSHLog.blockOnSync().
> Looking at TransactionProcessor.preDelete it is obvious why:
> The batch delete is translated into *single* puts that are added to the
> region one by one, so each time the WAL is flushed.
>
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
