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From: Patrick Hunt <phunt@apache.org>
Date: Tue, 21 Apr 2015 21:35:55 -0700
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 <CANLc_9LQ3O6eC_L2hLowza6RPSix13zcyPpJGeAtLO7xcrXRRw@mail.gmail.com>
Subject: Re: Intermittent connection loss error
To: UserZooKeeper <user@zookeeper.apache.org>
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Did you check the server logs? There might be an indication why it keeps
closing the connection.

Patrick

On Tue, Apr 21, 2015 at 7:43 AM, Lahiru Ginnaliya Gamathige <
glahiru@gmail.com> wrote:

> Hi Devs,
>
> We are using ZK in Apache Airavata and when we run it for sometime some
> connections are get lost and never get reconnect. I get following error and
> since I try to reconnect in my process method it keeps trying and exhaust
> the log. Of course I can fix the log issue but I am not sure why this is
> happening . I am using ZK in standalone mode just single instance and below
> is the code I use to reconnect and the log.
>
> 2015-04-08 09:43:10,785 [main-SendThread(gw111.iu.xsede.org:2181)] WARN
> org.apache.zookeeper.ClientCnxn - Session 0x0 for server
> gw111.iu.xsede.org/149.165.228.109:2181, unexpected error, closing socket
> connection and attempting reconnect
> java.io.IOException: Connection reset by peer
> at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
> at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
> at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
> at sun.nio.ch.IOUtil.read(IOUtil.java:192)
> at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
> at
> org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:66)
> at
>
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:291)
> at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1041)
>
>
> @Override
> synchronized public void process(WatchedEvent watchedEvent) {
>     logger.info(watchedEvent.getPath());
>     synchronized (mutex) {
>         Event.KeeperState state = watchedEvent.getState();
>         logger.info(state.name());
>         switch(state){
>             case SyncConnected:
>                 mutex.notify();
>             case Expired:case Disconnected:
>                 try {
>                     mutex = -1;
>                     zk = new
> ZooKeeper(AiravataZKUtils.getZKhostPort(),
> AiravataZKUtils.getZKTimeout(), this);
>                     synchronized (mutex) {
>                         mutex.wait();  // waiting for the syncConnected
> event
>                     }
>                     storeServerConfig();
>                 } catch (IOException e) {
>                     logger.error("Error while synchronizing with
> zookeeper", e);
>                 } catch (ApplicationSettingsException e) {
>                     logger.error("Error while synchronizing with
> zookeeper", e);
>                 } catch (InterruptedException e) {
>                     logger.error("Error while synchronizing with
> zookeeper", e);
>                 } catch (AiravataSystemException e) {
>                     logger.error("Error while synchronizing with
> zookeeper", e);
>                 }
>         }
>     }
> }
>
>
> Lahiru
>
>
> --
> Research Assistant
> Science Gateways Group
> Indiana University
>

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