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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-7268) correct local region location cache information can be overwritten w/stale information from an old server
Date Tue, 04 Dec 2012 03:27:58 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7268?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sergey Shelukhin updated HBASE-7268:
------------------------------------

    Description: 
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), 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.

  was:
Discovered via HBASE-7250; related to HBASE-5877.
Test is writing from multiple threads.
Server A has region R.
R gets moved from A to server B.
Server B gets killed.
Region gets moved by master to server C.
~15 seconds later, client tries to write to it.
Multiple client threads report "region moved from C to B", even though such transition never
happened (neither in nor before the sequence described below).

I have a patch but not sure if it works, test still fails locally for yet unknown reason.

    
> 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
>
> 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), 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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