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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7268) correct local region location cache information can be overwritten w/stale information from an old server
Date Fri, 11 Jan 2013 23:38:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13551637#comment-13551637
] 

Ted Yu commented on HBASE-7268:
-------------------------------

+1 on patch v7, after fixing the findbugs warning.
                
> correct local region location cache information can be overwritten w/stale information
from an old server
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-7268
>                 URL: https://issues.apache.org/jira/browse/HBASE-7268
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.96.0
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>            Priority: Minor
>             Fix For: 0.96.0
>
>         Attachments: 7268-v6.patch, HBASE-7268-v0.patch, HBASE-7268-v0.patch, HBASE-7268-v1.patch,
HBASE-7268-v2.patch, HBASE-7268-v2-plus-masterTs.patch, HBASE-7268-v2-plus-masterTs.patch,
HBASE-7268-v3.patch, HBASE-7268-v4.patch, HBASE-7268-v5.patch, HBASE-7268-v6.patch, HBASE-7268-v7.patch
>
>
> Discovered via HBASE-7250; related to HBASE-5877.
> Test is writing from multiple threads.
> Server A has region R; client knows that.
> R gets moved from A to server B.
> B gets killed.
> R gets moved by master to server C.
> ~15 seconds later, client tries to write to it (on A?).
> Multiple client threads report from RegionMoved exception processing logic "R moved from
C to B", even though such transition never happened (neither in nor before the sequence described
below). Not quite sure how the client learned of the transition to C, I assume it's from meta
from some other thread...
> Then, put fails (it may fail due to accumulated errors that are not logged, which I am
investigating... but the bogus cache update is there nonwithstanding).
> I have a patch but not sure if it works, test still fails locally for yet unknown reason.

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