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https://issues.apache.org/jira/browse/HBASE-8285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13628462#comment-13628462
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Hadoop QA commented on HBASE-8285:
----------------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12578112/8285-0.94-v3.txt
against trunk revision .
{color:green}+1 @author{color}. The patch does not contain any @author
tags.
{color:red}-1 tests included{color}. The patch doesn't appear to include
any new or modified tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
{color:red}-1 patch{color}. The patch command could not apply the patch.
Console output:
https://builds.apache.org/job/PreCommit-HBASE-Build/5253//console
This message is automatically generated.
> HBaseClient never recovers for single HTable.get() calls with no retries when
> regions move
> ------------------------------------------------------------------------------------------
>
> Key: HBASE-8285
> URL: https://issues.apache.org/jira/browse/HBASE-8285
> Project: HBase
> Issue Type: Bug
> Components: Client
> Affects Versions: 0.94.6.1
> Reporter: Varun Sharma
> Assignee: Varun Sharma
> Priority: Critical
> Fix For: 0.98.0, 0.94.7, 0.95.1
>
> Attachments: 8285-0.94.txt, 8285-0.94-v2.txt, 8285-0.94-v3.txt,
> 8285-trunk.txt, 8285-trunk-v2.txt
>
>
> Steps to reproduce this bug:
> 1) Gracefull restart a region server causing regions to get redistributed.
> 2) Client call to this region keeps failing since Meta Cache is never purged
> on the client for the region that moved.
> Reason behind the bug:
> 1) Client continues to hit the old region server.
> 2) The old region server throws NotServingRegionException which is not
> handled correctly and the META cache entries are never purged for that server
> causing the client to keep hitting the old server.
> The reason lies in ServerCallable code since we only purge META cache entries
> when there is a RetriesExhaustedException, SocketTimeoutException or
> ConnectException. However, there is no case check for
> NotServingRegionException(s).
> Why is this not a problem for Scan(s) and Put(s) ?
> a) If a region server is not hosting a region/scanner, then an
> UnknownScannerException is thrown which causes a relocateRegion() call
> causing a refresh of the META cache for that particular region.
> b) For put(s), the processBatchCallback() interface in HConnectionManager is
> used which clears out META cache entries for all kinds of exceptions except
> DoNotRetryException.
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