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Posted to issues@hbase.apache.org by "Sergey Shelukhin (JIRA)" <ji...@apache.org> on 2013/01/08 01:28:13 UTC
[jira] [Commented] (HBASE-7268) correct local region location cache
information can be overwritten w/stale information from an old server
[ https://issues.apache.org/jira/browse/HBASE-7268?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13546441#comment-13546441 ]
Sergey Shelukhin commented on HBASE-7268:
-----------------------------------------
[~stack] Any opinion on the last comment? Thanks.
> 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: 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
>
>
> 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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