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From "Alex Newman (JIRA)" <j...@apache.org>
Subject [jira] Created: (ZOOKEEPER-785) Zookeeper 3.3.1 shouldn't infinite loop if someone creates a server.0 line
Date Wed, 02 Jun 2010 22:51:55 GMT
 Zookeeper 3.3.1 shouldn't infinite loop if someone creates a server.0 line
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                 Key: ZOOKEEPER-785
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-785
             Project: Zookeeper
          Issue Type: Bug
    Affects Versions: 3.3.1
         Environment: Tested in linux with a new jvm
            Reporter: Alex Newman


The following config causes an infinite loop

[zoo.cfg]
tickTime=2000
dataDir=/var/zookeeper/
clientPort=2181
initLimit=10
syncLimit=5
server.0=localhost:2888:3888

Output:

2010-06-01 16:20:32,471 - INFO [main:QuorumPeerMain@119] - Starting quorum peer
2010-06-01 16:20:32,489 - INFO [main:NIOServerCnxn$Factory@143] - binding to port 0.0.0.0/0.0.0.0:2181
2010-06-01 16:20:32,504 - INFO [main:QuorumPeer@818] - tickTime set to 2000
2010-06-01 16:20:32,504 - INFO [main:QuorumPeer@829] - minSessionTimeout set to -1
2010-06-01 16:20:32,505 - INFO [main:QuorumPeer@840] - maxSessionTimeout set to -1
2010-06-01 16:20:32,505 - INFO [main:QuorumPeer@855] - initLimit set to 10
2010-06-01 16:20:32,526 - INFO [main:FileSnap@82] - Reading snapshot /var/zookeeper/version-2/snapshot.c
2010-06-01 16:20:32,547 - INFO [Thread-1:QuorumCnxManager$Listener@436] - My election bind
port: 3888
2010-06-01 16:20:32,554 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumPeer@620] - LOOKING
2010-06-01 16:20:32,556 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@649] -
New election. My id = 0, Proposed zxid = 12
2010-06-01 16:20:32,558 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@689] -
Notification: 0, 12, 1, 0, LOOKING, LOOKING, 0
2010-06-01 16:20:32,560 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumPeer@623] - Unexpected
exception
java.lang.NullPointerException
at org.apache.zookeeper.server.quorum.FastLeaderElection.totalOrderPredicate(FastLeaderElection.java:496)
at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:709)
at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:621)
2010-06-01 16:20:32,560 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumPeer@620] - LOOKING
2010-06-01 16:20:32,560 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@649] -
New election. My id = 0, Proposed zxid = 12
2010-06-01 16:20:32,561 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@689] -
Notification: 0, 12, 2, 0, LOOKING, LOOKING, 0
2010-06-01 16:20:32,561 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumPeer@623] - Unexpected
exception
java.lang.NullPointerException
at org.apache.zookeeper.server.quorum.FastLeaderElection.totalOrderPredicate(FastLeaderElection.java:496)
at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:709)
at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:621)
2010-06-01 16:20:32,561 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumPeer@620] - LOOKING
2010-06-01 16:20:32,562 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@649] -
New election. My id = 0, Proposed zxid = 12
2010-06-01 16:20:32,562 - INFO [QuorumPeer:/0:0:0:0:0:0:0:0:2181:FastLeaderElection@689] -
Notification: 0, 12, 3, 0, LOOKING, LOOKING, 0
2010-06-01 16:20:32,562 - WARN [QuorumPeer:/0:0:0:0:0:0:0:0:2181:QuorumPeer@623] - Unexpected
exception
java.lang.NullPointerException


Things like HBase require that the zookeeper servers be listed in the zoo.cfg. This is a bug
on their part, but zookeeper shouldn't null pointer in a loop though.


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