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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-6860) [replication] HBASE-6550 is too aggressive, DDOSes .META.
Date Fri, 21 Sep 2012 21:44:08 GMT

     [ https://issues.apache.org/jira/browse/HBASE-6860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jean-Daniel Cryans resolved HBASE-6860.
---------------------------------------

      Resolution: Fixed
        Assignee: Jean-Daniel Cryans
    Hadoop Flags: Reviewed

Committed to trunk and 0.94, thanks Stack.
                
> [replication] HBASE-6550 is too aggressive, DDOSes .META.
> ---------------------------------------------------------
>
>                 Key: HBASE-6860
>                 URL: https://issues.apache.org/jira/browse/HBASE-6860
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>            Priority: Blocker
>             Fix For: 0.94.2, 0.96.0
>
>         Attachments: HBASE-6860.patch
>
>
> I was doing maintenance on clusters and rebooting a replication slave was giving me a
lot of issues because the master wasn't able to read .META. while it was bombarded with getClosestRowBefore()
coming from all the ReplicationSinks. Since no regions are assigned, and it doesn't retry,
it goes straight back to the source which retries again.
> Also it seems that in some cases with retries=1 we don't even recover from a stale .META.
cache.

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