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Posted to issues@hbase.apache.org by "Lars Hofhansl (Commented) (JIRA)" <ji...@apache.org> on 2012/03/31 05:02:24 UTC
[jira] [Commented] (HBASE-5682) Add retry logic in
HConnectionImplementation#resetZooKeeperTrackers (for 0.94 only)
[ https://issues.apache.org/jira/browse/HBASE-5682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242980#comment-13242980 ]
Lars Hofhansl commented on HBASE-5682:
--------------------------------------
A little bit more background:
I put HBASE-4805 in place to be able to use the standard HBase client in long running app server processes. The idea is that one can manage an HConnection and a ThreadPool per app server and then cheaply create HTables when needed.
For that setup it is vital that the HConnection does not become unusable when there are temporary network outages, or that HBase cluster is temporarily taken down.
In that case the clients should timeout quickly to allow the application to react to it, and if the network/cluster has recovered the application should be able to recover.
> Add retry logic in HConnectionImplementation#resetZooKeeperTrackers (for 0.94 only)
> -----------------------------------------------------------------------------------
>
> Key: HBASE-5682
> URL: https://issues.apache.org/jira/browse/HBASE-5682
> Project: HBase
> Issue Type: Improvement
> Components: client
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 0.94.1
>
> Attachments: 5682.txt
>
>
> Just realized that without this HBASE-4805 is broken.
> I.e. there's no point keeping a persistent HConnection around if it can be rendered permanently unusable if the ZK connection is lost temporarily.
> Note that this is fixed in 0.96 with HBASE-5399 (but that seems to big to backport)
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