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.
Regards, Indira Priyadharshini ______________________________________ From: Lahiru Ginnaliya Gamathige <[email protected]> Sent: Tuesday, April 21, 2015 8:13 PM To: [email protected] 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/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 The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. www.wipro.com
