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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7638) [0.94] region cache entry should only be removed on error if the error is from the server currently in cache
Date Thu, 24 Jan 2013 18:25:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13561823#comment-13561823
] 

Sergey Shelukhin commented on HBASE-7638:
-----------------------------------------

The problems arises in multithreaded case (actually I only observed it in trunk, but I assumed
this should also apply to 94).
One thread gets A from cache and goes to A. Thread 2 does the same. Thread 1 errors out and
updates the location from META to new correct location. Thread 2 errors out and removes it
from cache. So it's not critical, just adds extra meta trips. In integration test where there
are many threads and many errors it was relatively more prominent.
I think it's made possible in no small part by using delayed callable, where we first build
the request, including the destination server, then wait.
                
> [0.94] region cache entry should only be removed on error if the error is from the server
currently in cache
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-7638
>                 URL: https://issues.apache.org/jira/browse/HBASE-7638
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.4
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>            Priority: Minor
>             Fix For: 0.94.5
>
>         Attachments: HBASE-7638-v0.patch
>
>
> See HBASE-7268. 

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