[CURATOR-285] LeaderElection with 3.0.0

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 3.0.0
• Component/s: Recipes
• Environment: Mac OS X version 10.11.1, Java 1.8.0_45, ZooKeeper 3.4.7
• Flags: Important
• Assignee: Unassigned
• Reporter: Kunal Bharati
• Created: 08/Jan/16 10:07
• Updated: 06/Oct/17 14:24
• Resolved: 06/Oct/17 14:24

Description

I am running 3 instances of ZooKeeper and the config is this:

tickTime=2000
initLimit=10
syncLimit=5
dataDir=/tmp/zookeeper1
clientPort=2181
maxClientCnxns=1000
server.1=127.0.0.1:2888:3888
server.2=127.0.0.1:2889:3889
server.3=127.0.0.1:2890:3890

I am using the leader election example code given here: https://git-wip-us.apache.org/repos/asf?p=curator.git;a=tree;f=curator-examples/src/main/java/leader;h=73b547eadb98995c0ccbd06a5b76d0741ffef263;hb=HEAD

The code runs fine with TestingServer but when I change connection string to : "127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183", I get the exceptions:

[main-SendThread(127.0.0.1:2183)] INFO org.apache.zookeeper.ClientCnxn - Opening socket connection to server 127.0.0.1/127.0.0.1:2183. Will not attempt to authenticate using SASL (unknown error)
[main-SendThread(127.0.0.1:2183)] INFO org.apache.zookeeper.ClientCnxn - Socket connection established, initiating session, client: /127.0.0.1:56111, server: 127.0.0.1/127.0.0.1:2183
[main-SendThread(127.0.0.1:2183)] INFO org.apache.zookeeper.ClientCnxn - Session establishment complete on server 127.0.0.1/127.0.0.1:2183, sessionid = 0x3521552283c0000, negotiated timeout = 40000
[main-EventThread] INFO org.apache.curator.framework.state.ConnectionStateManager - State change: CONNECTED
[main-SendThread(127.0.0.1:2183)] INFO org.apache.zookeeper.ClientCnxn - Unable to read additional data from server sessionid 0x3521552283c0000, likely server has closed socket, closing socket connection and attempting reconnect
[main-EventThread] INFO org.apache.curator.framework.imps.EnsembleTracker - New config event received: null
[main-EventThread] ERROR org.apache.curator.framework.imps.CuratorFrameworkImpl - Background exception was not retry-able or retry gave up
java.lang.NullPointerException
at java.io.ByteArrayInputStream.<init>(ByteArrayInputStream.java:106)
at org.apache.curator.framework.imps.EnsembleTracker.processConfigData(EnsembleTracker.java:163)
at org.apache.curator.framework.imps.EnsembleTracker.access$200(EnsembleTracker.java:48)
at org.apache.curator.framework.imps.EnsembleTracker$2.processResult(EnsembleTracker.java:134)
at org.apache.curator.framework.imps.CuratorFrameworkImpl.sendToBackgroundCallback(CuratorFrameworkImpl.java:829)
at org.apache.curator.framework.imps.CuratorFrameworkImpl.processBackgroundOperation(CuratorFrameworkImpl.java:611)
at org.apache.curator.framework.imps.WatcherRemovalFacade.processBackgroundOperation(WatcherRemovalFacade.java:151)
at org.apache.curator.framework.imps.GetConfigBuilderImpl$2.processResult(GetConfigBuilderImpl.java:210)
at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:619)
at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:528)
[main-EventThread] INFO org.apache.curator.framework.state.ConnectionStateManager - State change: SUSPENDED

Issue Links

• duplicates: CURATOR-284 NullPointerException at EnsembleTracker.processConfigData