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https://issues.apache.org/jira/browse/HBASE-4519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13126483#comment-13126483
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nkeywal commented on HBASE-4519:
--------------------------------

Seems that HBASE-1291 is on the same subject, and it says:

bq. We currently use 10 seconds for zookeeper.session.timeout. I tried bumping 
this down recently to 2 seconds, and it broke the tests. We need to investigate 
why this change breaks our test.

So the timeout have been increased somewhere...
                
> 25s sleep when expiring sessions in tests
> -----------------------------------------
>
>                 Key: HBASE-4519
>                 URL: https://issues.apache.org/jira/browse/HBASE-4519
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.4
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.92.0
>
>
> There's a hardcoded 25 seconds sleep in HBaseTestingUtility.expireSession: 
> {code}
> int sessionTimeout = 5 * 1000; // 5 seconds
> ...
> final long sleep = sessionTimeout * 5L;
> LOG.info("ZK Closed Session 0x" + Long.toHexString(sessionID) +
>   "; sleeping=" + sleep);
> Thread.sleep(sleep);
> {code}
> I'm pretty sure this can be lowered at lot, and it would speed up a couple of 
> tests. The only thing I'm afraid of is if this was made to accomodate flaky 
> tests.

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