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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-3510) Frequent 'zkServer.sh stop' failures when running C test suite
Date Thu, 15 Aug 2019 08:23:00 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-3510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ASF GitHub Bot updated ZOOKEEPER-3510:
--------------------------------------
    Labels: pull-request-available  (was: )

> Frequent 'zkServer.sh stop' failures when running C test suite
> --------------------------------------------------------------
>
>                 Key: ZOOKEEPER-3510
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3510
>             Project: ZooKeeper
>          Issue Type: Bug
>            Reporter: Damien Diederen
>            Priority: Minor
>              Labels: pull-request-available
>
> As mentioned in https://github.com/apache/zookeeper/pull/1054#discussion_r314208678 :
> There is a {{sleep 3}} statement in {{zkServer.sh restart}}.  I am unable to unearth
the history of that particular line, but I believe part—if not all—of that {{sleep}} should
be part of {{zkServer.sh stop}}.
> I frequently observe {{FAILED TO START}} errors in the C test suite; the logs consistently
show that those are caused by {{java.net.BindException: Address already in use}}.  Adding
a simple {{sleep 1}} before {{echo STOPPED}} "fixes" it for me.  I will submit an initial
PR with the corresponding change and a commit message akin to:
> ----
> ZOOKEEPER-XXXX: Make zkServer.sh stop more reliable
> Kill is asynchronous, and without the sleep, the server's TCP port can still be busy
when the next server is started—causing flaky runs of the C client's test suite.
> (It would probably be better to spin a few times, probing with ps -p.)
> ----
> As noted above, the sleep is far from optimal, an adaptive mechanism would be better—but
I do not want to make the first iteration too complicated.



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