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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-8150) server should not produce RAITE for already-opening region in 0.94 (because master retry logic handles this case poorly)
Date Fri, 05 Apr 2013 00:18:26 GMT

     [ https://issues.apache.org/jira/browse/HBASE-8150?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-8150:
---------------------------------

    Fix Version/s:     (was: 0.94.7)
                   0.94.8
    
> server should not produce RAITE for already-opening region in 0.94 (because master retry
logic handles this case poorly)
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-8150
>                 URL: https://issues.apache.org/jira/browse/HBASE-8150
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.6
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>            Priority: Minor
>             Fix For: 0.94.8
>
>         Attachments: HBASE-8150-v0-094.patch
>
>
> The code in 0.94 AM sets the region plan to point to the same server when retrying the
assignment due to RAITE.
> {code}
> LOG.warn("Failed assignment of "
>             + state.getRegion().getRegionNameAsString()
>             + " to "
>             + plan.getDestination()
>             + ", trying to assign "
>             + (regionAlreadyInTransitionException ? "to the same region server"
>                 + " because of RegionAlreadyInTransitionException;" : "elsewhere instead;
")
>             + "retry=" + i, t);
> {code}
> However, there's no wait time in the loop that retries the assignment, and if region
is being marked failed to open, which may take some time, master can easily exhaust retries
in less than half a second, going to the same server every time and getting the same exception
(unfortunately I no longer have logs); then the region will be stuck.
> Do you think this is worth fixing (for example, by not using the same server here after
a few retries, or by adding timed backoff in such cases)?

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