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https://issues.apache.org/jira/browse/ZOOKEEPER-251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mahadev konar updated ZOOKEEPER-251:
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Status: Patch Available (was: Open)
> NullPointerException stopping and starting Zookeeper servers
> ------------------------------------------------------------
>
> Key: ZOOKEEPER-251
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-251
> Project: Zookeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.0.1, 3.0.0
> Environment: Tested with JDK 1.5, Solaris, but I suspect it is not
> relevant in this case.
> Reporter: Thomas Vinod Johnson
> Assignee: Mahadev konar
> Priority: Blocker
> Fix For: 3.1.0
>
> Attachments: ZOOKEEPER-251.patch, ZOOKEEPER-251.patch
>
>
> See the following thread for the original report:
> http://mail-archives.apache.org/mod_mbox/hadoop-zookeeper-user/200812.mbox/browser
> Steps to reproduce:
> 1) Start a replicated zookeeper service consisting of 3 zookeeper (3.0.1)
> servers all running on the same host (of course, all using their own ports
> and log directories)
> 2) Create one znode in this ensemble (using the zookeeper client console, I
> issued 'create /node1 node1data').
> 3) Stop, then restart a single zookeeper server; moving onto the next one a
> few seconds later.
> 4) Go back to 3. After 4-5 iterations, the following should occur, with the
> failing server exiting:
> java.lang.NullPointerException
> at
> org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.next(FileTxnLog.java:447)
> at
> org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.init(FileTxnLog.java:358)
> at
> org.apache.zookeeper.server.persistence.FileTxnLog$FileTxnIterator.<init>(FileTxnLog.java:333)
> at
> org.apache.zookeeper.server.persistence.FileTxnLog.read(FileTxnLog.java:250)
> at
> org.apache.zookeeper.server.persistence.FileTxnSnapLog.restore(FileTxnSnapLog.java:102)
> at
> org.apache.zookeeper.server.ZooKeeperServer.loadData(ZooKeeperServer.java:183)
> at org.apache.zookeeper.server.quorum.Leader.lead(Leader.java:245)
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:421)
> 2008-12-08 14:14:24,880 - INFO
> [QuorumPeer:/0:0:0:0:0:0:0:0:2183:[EMAIL PROTECTED] - Shutdown called
> java.lang.Exception: shutdown Leader! reason: Forcing shutdown
> at
> org.apache.zookeeper.server.quorum.Leader.shutdown(Leader.java:336)
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:427)
> Exception in thread "QuorumPeer:/0:0:0:0:0:0:0:0:2183"
> java.lang.NullPointerException
> at
> org.apache.zookeeper.server.quorum.Leader.shutdown(Leader.java:339)
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:427)
> The inputStream field is null, apparently because next is being called
> at line 358 even after next returns false. Having very little knowledge
> about the implementation, I don't know if the existence of hdr.getZxid()
> >= zxid is supposed to be an invariant across all invocations of the
> server; however the following change to FileTxnLog.java seems to make
> the problem go away.
> diff FileTxnLog.java /tmp/FileTxnLog.java
> 358c358,359
> < next();
> ---
> > if (!next())
> > return;
> 447c448,450
> < inputStream.close();
> ---
> > if (inputStream != null) {
> > inputStream.close();
> > }
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