Changgeng Li created HELIX-608:
----------------------------------
Summary: NPE and unable to reconnect to zookeeper after a network
outage
Key: HELIX-608
URL: https://issues.apache.org/jira/browse/HELIX-608
Project: Apache Helix
Issue Type: Bug
Components: helix-core
Affects Versions: 0.7.1
Reporter: Changgeng Li
I noticed one of the participant is not a live instance in zookeeper after a
network outage, while the java process is live. I have to restart the java
process to make it live again.
Found following logs:
ERROR 2015-07-28 17:12:15,010 [main-EventThread]
org.apache.zookeeper.ClientCnxn: Error while calling watcher
java.lang.RuntimeException: Exception while restarting zk client
at org.I0Itec.zkclient.ZkClient.processStateChanged(ZkClient.java:462)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkClient.process(ZkClient.java:368)
~[telegraph.jar:?]
at
org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:531)
[telegraph.jar:?]
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:507)
[telegraph.jar:?]
Caused by: org.I0Itec.zkclient.exception.ZkException: Unable to connect to
zeusglobalwo035.dummy.com:2181,zeusglobalwo044.frc3.dummy.com:2181/instagram-a
at org.I0Itec.zkclient.ZkConnection.connect(ZkConnection.java:66)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkClient.reconnect(ZkClient.java:935)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkClient.processStateChanged(ZkClient.java:458)
~[telegraph.jar:?]
... 3 more
Caused by: java.net.UnknownHostException: zeusglobalwo035.dummy.com: Temporary
failure in name resolution
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
~[?:1.7.0_72]
at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:901)
~[?:1.7.0_72]
at
java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1293)
~[?:1.7.0_72]
at java.net.InetAddress.getAllByName0(InetAddress.java:1246)
~[?:1.7.0_72]
at java.net.InetAddress.getAllByName(InetAddress.java:1162)
~[?:1.7.0_72]
at java.net.InetAddress.getAllByName(InetAddress.java:1098)
~[?:1.7.0_72]
at org.apache.zookeeper.ClientCnxn.<init>(ClientCnxn.java:387)
~[telegraph.jar:?]
at org.apache.zookeeper.ClientCnxn.<init>(ClientCnxn.java:332)
~[telegraph.jar:?]
at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:383)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkConnection.connect(ZkConnection.java:64)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkClient.reconnect(ZkClient.java:935)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkClient.processStateChanged(ZkClient.java:458)
~[telegraph.jar:?]
... 3 more
INFO 2015-07-28 17:12:15,010 [main-EventThread]
org.apache.zookeeper.ClientCnxn: EventThread shut down
ERROR 2015-07-28 17:12:15,014
[ZkClient-EventThread-184-zeusglobalwo035.dummy.com:2181,zeusglobalwo044.frc3.dummy.com:2181/instagram-a]
org.I0Itec.zkclient.ZkEventThread: Error handling event ZkEvent[Children of
/telegraph/INSTANCES/10.211.12.21_9000/MESSAGES changed sent to
org.apache.helix.manager.zk.ZkCallbackHandler@71bd5cfa]
java.lang.NullPointerException
at org.I0Itec.zkclient.ZkConnection.exists(ZkConnection.java:95)
~[telegraph.jar:?]
at org.apache.helix.manager.zk.ZkClient$2.call(ZkClient.java:195)
~[telegraph.jar:?]
at org.apache.helix.manager.zk.ZkClient$2.call(ZkClient.java:192)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
~[telegraph.jar:?]
at org.apache.helix.manager.zk.ZkClient.exists(ZkClient.java:192)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkClient.exists(ZkClient.java:445)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkClient$7.run(ZkClient.java:566)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkEventThread.run(ZkEventThread.java:71)
[telegraph.jar:?]
ERROR 2015-07-28 17:12:15,015
[ZkClient-EventThread-184-zeusglobalwo035.dummy.com:2181,zeusglobalwo044.frc3.dummy.com:2181/instagram-a]
org.I0Itec.zkclient.ZkEventThread: Error handling event ZkEvent[Children of
/telegraph/EXTERNALVIEW changed sent to
org.apache.helix.manager.zk.ZkCallbackHandler@35d1655]
java.lang.NullPointerException
at org.I0Itec.zkclient.ZkConnection.exists(ZkConnection.java:95)
~[telegraph.jar:?]
at org.apache.helix.manager.zk.ZkClient$2.call(ZkClient.java:195)
~[telegraph.jar:?]
at org.apache.helix.manager.zk.ZkClient$2.call(ZkClient.java:192)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
~[telegraph.jar:?]
at org.apache.helix.manager.zk.ZkClient.exists(ZkClient.java:192)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkClient.exists(ZkClient.java:445)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkClient$7.run(ZkClient.java:566)
~[telegraph.jar:?]
at org.I0Itec.zkclient.ZkEventThread.run(ZkEventThread.java:71)
[telegraph.jar:?]
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