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From "Patrick Hunt (JIRA)" <j...@apache.org>
Subject [jira] Commented: (ZOOKEEPER-785) Zookeeper 3.3.1 shouldn't infinite loop if someone creates a server.0 line
Date Thu, 03 Jun 2010 18:22:53 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12875229#action_12875229
] 

Patrick Hunt commented on ZOOKEEPER-785:
----------------------------------------

imo ERROR is correct for the 1 server case as there's no way that could be right and we want
to bring to operator attention - they need to fix it.


>  Zookeeper 3.3.1 shouldn't infinite loop if someone creates a server.0 line
> ---------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-785
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-785
>             Project: Zookeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.3.1
>         Environment: Tested in linux with a new jvm
>            Reporter: Alex Newman
>            Assignee: Patrick Hunt
>             Fix For: 3.3.2, 3.4.0
>
>         Attachments: ZOOKEEPER-785.patch
>
>
> 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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