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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6165) Replication can overrun .META scans on cluster re-start
Date Thu, 09 Aug 2012 17:40:19 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13432015#comment-13432015
] 

Lars Hofhansl commented on HBASE-6165:
--------------------------------------

Patch looks good generally. Few comments:
# The naming is weird. These are not "Custom"QOS, but "Medium"QOS methods, right?
# Is there a way to generalize this to sets of Handlers with different priority (not important,
though).
# By default now (if hbase.regionserver.custom.priority.handler.count is not set), replicateWALEntry
would use non-priority handlers... Which is not right, I think. It should revert back to the
current behavior in that case (which is to do use the priorityQOS.

What I still do not understand... Does this problem always happen? Does it happen because
replicateWALEntry takes too long to finish? Does this only happen when the slave is already
degraded for other reasons? Should we also work on replicateWALEntry failing faster in case
of problems (shorter/fewer retries, etc)?
                
> Replication can overrun .META scans on cluster re-start
> -------------------------------------------------------
>
>                 Key: HBASE-6165
>                 URL: https://issues.apache.org/jira/browse/HBASE-6165
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Elliott Clark
>         Attachments: HBase-6165-v1.patch
>
>
> When restarting a large set of regions on a reasonably small cluster the replication
from another cluster tied up every xceiver meaning nothing could be onlined.

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