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https://issues.apache.org/jira/browse/ZOOKEEPER-2570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arshad Mohammad updated ZOOKEEPER-2570:
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Attachment: ZOOKEEPER-2570-01.patch
Submitting a test patch
> ZooKeeper clients are timed out when ZooKeeper servers are very busy
> --------------------------------------------------------------------
>
> Key: ZOOKEEPER-2570
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2570
> Project: ZooKeeper
> Issue Type: Bug
> Reporter: Arshad Mohammad
> Assignee: Arshad Mohammad
> Priority: Critical
> Attachments: ZOOKEEPER-2570-01.patch
>
>
> ZooKeeper clients are timed out when ZooKeeper servers are very busy. Clients
> throw below exception and fail all the pending operations
> {code}
> org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode
> = ConnectionLoss
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
> {code}
> Clients log bellow information
> {noformat}
> 2016-09-22 01:49:08,001 [myid:127.0.0.1:11228] - WARN
> [main-SendThread(127.0.0.1:11228):ClientCnxn$SendThread@1181] - Client
> session timed out, have not heard from server in 13908ms for sessionid
> 0x20000d21b280000
> 2016-09-22 01:49:08,001 [myid:127.0.0.1:11228] - INFO
> [main-SendThread(127.0.0.1:11228):ClientCnxn$SendThread@1229] - Client
> session timed out, have not heard from server in 13908ms for sessionid
> 0x20000d21b280000, closing socket connection and attempting reconnect
> {noformat}
> *STEPS TO REPRODECE:*
> # Create multi operation
> {code}
> List<Op> ops = new ArrayList<Op>();
> for (int i = 0; i < N; i++) {
> Op create = Op.create(rootNode + "/" + i, "".getBytes(),
> ZooDefs.Ids.OPEN_ACL_UNSAFE,
> CreateMode.PERSISTENT);
> ops.add(create);
> }
> {code}
> Chose N in such a way that the total multi operation request size is less
> than but near 1 MB. For bigger request size increase jute.maxbuffer in
> servers
> # Submit the multi operation request
> {code} zooKeeper.multi(ops);{code}
> # After repeating above steps few times issue is reproduced
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