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Posted to issues@hbase.apache.org by "Nicolas Spiegelberg (JIRA)" <ji...@apache.org> on 2012/04/27 20:44:50 UTC
[jira] [Commented] (HBASE-5890) SplitLog Rescan BusyWaits upon
Zk.CONNECTIONLOSS
[ https://issues.apache.org/jira/browse/HBASE-5890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263880#comment-13263880 ]
Nicolas Spiegelberg commented on HBASE-5890:
--------------------------------------------
The original idea is to have a timeout when we encounter this error. Since we have a recoverable ZK, it seems okay to retry after connection loss; but we should have some sort of dampening so that this isn't a CPU & log hog.
> SplitLog Rescan BusyWaits upon Zk.CONNECTIONLOSS
> ------------------------------------------------
>
> Key: HBASE-5890
> URL: https://issues.apache.org/jira/browse/HBASE-5890
> Project: HBase
> Issue Type: Bug
> Reporter: Nicolas Spiegelberg
> Priority: Minor
>
> We ran into a production issue yesterday where the SplitLogManager tried to create a Rescan node in ZK. The createAsync() generated a KeeperException.CONNECTIONLOSS that was immedately sent to processResult(), createRescan node with --retry_count was called, and this created a CPU busywait that also clogged up the logs. We should handle this better.
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