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From "Gabriel Reid (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7325) Replication reacts slowly on a lightly-loaded cluster
Date Tue, 11 Dec 2012 16:35:21 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gabriel Reid updated HBASE-7325:
--------------------------------

    Attachment: HBASE-7325.patch

Patch to reset the sleep multiplier if there is no data available to replicate (and it is
not an error situation)
                
> 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.

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