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From "Enrico Olivelli (Jira)" <j...@apache.org>
Subject [jira] [Updated] (ZOOKEEPER-1855) calls to zoo_set_server() fail to flush outstanding request queue.
Date Fri, 06 Sep 2019 15:45:07 GMT

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-1855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Enrico Olivelli updated ZOOKEEPER-1855:
---------------------------------------
    Fix Version/s:     (was: 3.5.6)

> calls to zoo_set_server() fail to flush outstanding request queue.
> ------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-1855
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1855
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: c client
>            Reporter: Dutch T. Meyer
>            Priority: Minor
>             Fix For: 3.6.0, 3.5.7
>
>
> If one calls zoo_set_servers to update with a new server list that does not contain the
currently connected server, the client will disconnect.  Fair enough, but any outstanding
requests on the set_requests queue aren't completed, so the next completed request from the
new server can fail with an out-of-order XID error.
> The disconnect occurs in update_addrs(), when a reconfig is necessary, though it's not
quite as easy as just calling cleanup_bufs there, because you could then race the call to
dequeue_completion in zookeeper_process and pull NULL entries for a recently completed request
> I don't have a patch for this right now, but I do have a simple repro I can post when
time permits.



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