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From Andrew McNair <andrew.mcn...@gmail.com>
Subject Re: NullPointerException in FileTxnsnapLog.processTransaction (ZK 3.4.1)
Date Tue, 20 Dec 2011 01:28:52 GMT
Sorry, I'd missed this message. I just created ZOOKEEPER-1333 for the
same issue.

-Andrew

On Mon, Dec 19, 2011 at 2:48 PM, Jeremy Stribling <strib@nicira.com> wrote:
> I'm seeing a NullPointerException in ZK 3.4.1, and it seems to usually
> happen when I restart a server from standalone mode into quorum mode.  It
> doesn't happen every time, but I can reproduce it pretty reliably in my
> tests:
>
> 2011-12-19 14:33:04,036 2195 [pool-1-thread-2] INFO
> org.apache.zookeeper.server.quorum.QuorumPeer  - tickTime set to 3000
> 2011-12-19 14:33:04,036 2195 [pool-1-thread-2] INFO
> org.apache.zookeeper.server.quorum.QuorumPeer  - initLimit set to 5
> 2011-12-19 14:33:04,038 2197 [pool-1-thread-2] INFO
> org.apache.zookeeper.server.persistence.FileSnap  - Reading snapshot
> <zkdir>/version-2/snapshot.0
> 2011-12-19 14:33:04,040 2199 [pool-1-thread-2] DEBUG
> org.apache.zookeeper.server.persistence.FileTxnLog  - Created new input
> stream <zkdir>/version-2/log.1
> 2011-12-19 14:33:04,041 2200 [pool-1-thread-2] DEBUG
> org.apache.zookeeper.server.persistence.FileTxnLog  - Created new input
> archive <zkdir>/version-2/log.1
> 2011-12-19 14:33:04,041 2200 [pool-1-thread-2] DEBUG
> org.apache.zookeeper.server.DataTree  - Ignoring processTxn failure hdr: -1
> : error: -101
> java.lang.NullPointerException
>        at
> org.apache.zookeeper.server.persistence.FileTxnSnapLog.processTransaction(FileTxnSnapLog.java:203)
>        at
> org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:150)
>        at
> org.apache.zookeeper.server.ZKDatabase.loadDataBase(ZKDatabase.java:223)
>        at
> org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:418)
>        at
> org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:410)
>        at
> com.nicira.onix.zookeeper.Zookeeper.StartZookeeper(Zookeeper.java:203)
>        at
> com.nicira.onix.zookeeper.Zookeeper.RestartZookeeper(Zookeeper.java:282)
>        at com.nicira.onix.zookeeper.ZKRPCService.setServers(ZKRPC.java:83)
>        at
> com.nicira.onix.zookeeper.Zkrpc$ZKRPCService.callMethod(Zkrpc.java:8487)
>        at com.nicira.onix.rpc.RPC$10.run(RPC.java:534)
>        at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
>        at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
>        at java.lang.Thread.run(Thread.java:636)
>
> (Note that I've replaced my zookeeper directory in the message above with
> <zkdir> for readability.)
>
> It appears to be a problem in the on-disk data, since if I then try starting
> up a standalone server with the same directory, I get the same error.  I've
> attached a tarball containing the version-2 directory that demonstrates the
> problem.
>
> If folks think this is a real problem in supported Zookeeper configurations,
> I'll happily open a JIRA.
>
> Jeremy
>

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