[jira] [Created] (ZOOKEEPER-1855) calls to zoo_set_server() fail to flush outstanding request queue.

["Dutch T. Meyer (JIRA)" <ji...@apache.org>]

Dutch T. Meyer created ZOOKEEPER-1855:
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             Summary: 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


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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