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From <indirapriyadharshini.thangam...@wipro.com>
Subject Re: Intermittent connection loss error
Date Wed, 22 Apr 2015 04:51:00 GMT
Hi Lahiru Ginnaliya Gamathige,

Once in a while there may be a time change caused by NTP which causes all zookeeper client
sessions to close. This may be the reason. Pls refer https://issues.apache.org/jira/browse/ZOOKEEPER-1366.
(But this has been fixed in 3.5.1). This may help you.

Indira Priyadharshini
From: Lahiru Ginnaliya Gamathige <glahiru@gmail.com>
Sent: Tuesday, April 21, 2015 8:13 PM
To: user@zookeeper.apache.org
Subject: Intermittent connection loss error

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/, 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.ClientCnxn$SendThread.run(ClientCnxn.java:1041)

synchronized public void process(WatchedEvent watchedEvent) {
    synchronized (mutex) {
        Event.KeeperState state = watchedEvent.getState();
            case SyncConnected:
            case Expired:case Disconnected:
                try {
                    mutex = -1;
                    zk = new
AiravataZKUtils.getZKTimeout(), this);
                    synchronized (mutex) {
                        mutex.wait();  // waiting for the syncConnected event
                } 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);


Research Assistant
Science Gateways Group
Indiana University
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