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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8150) the code that handles RAITE on master in 0.94 should not always use the same plan
Date Wed, 20 Mar 2013 17:27:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607885#comment-13607885
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Sergey Shelukhin commented on HBASE-8150:
-----------------------------------------

bq. We could return OPENED for the case RegionAlreadyInTransitionException.
It can actually happen during transition to failed_open, the thread only sees region in rits,
it doesn't know what open handler is doing.
Wouldn't region be stuck in this case if master assumes server will finish the assignment?
                
> the code that handles RAITE on master in 0.94 should not always use the same plan
> ---------------------------------------------------------------------------------
>
>                 Key: HBASE-8150
>                 URL: https://issues.apache.org/jira/browse/HBASE-8150
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Priority: Minor
>
> 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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