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https://issues.apache.org/jira/browse/ZOOKEEPER-3510?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated ZOOKEEPER-3510:
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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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