[jira] [Commented] (HBASE-7325) Replication reacts slowly on a lightly-loaded cluster

["Jean-Daniel Cryans (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-7325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13529488#comment-13529488 ] 

Jean-Daniel Cryans commented on HBASE-7325:
-------------------------------------------

Sounds good Gabriel, did you test the patch by any chance?

My original worry when I wrote that code was that you wouldn't want to put unnecessary load on the Namenode if nothing was needing replication, but a 1 second pause is probably good enough.
                
> Replication reacts slowly on a lightly-loaded cluster
> -----------------------------------------------------
>
>                 Key: HBASE-7325
>                 URL: https://issues.apache.org/jira/browse/HBASE-7325
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication
>            Reporter: Gabriel Reid
>            Priority: Minor
>         Attachments: HBASE-7325.patch
>
>
> ReplicationSource uses a backing-off algorithm to sleep for an increasing duration when an error is encountered in the replication run loop. However, this backing-off is also performed when there is nothing found to replicate in the HLog.
> Assuming default settings (1 second base retry sleep time, and maximum multiplier of 10), this means that replication takes up to 10 seconds to occur when there is a break of about 55 seconds without anything being written. As there is no error condition, and there is apparently no substantial load on the regionserver in this situation, it would probably make more sense to not back off in non-error situations.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira