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From Aaron Zimmerman <azimmer...@sproutsocial.com>
Subject Re: entire cluster dies with EOFException
Date Fri, 04 Jul 2014 22:35:02 GMT
Thanks for getting back to me.

Jordan,

I don't think we are doing any large nodes or thousands of children.  We
are using zookeeper for storm and service discovery, so things are pretty
modest.

Camille,

I've created https://issues.apache.org/jira/browse/ZOOKEEPER-1955, and
attached the snapshot causing the EOF exception (I think..?), let me know
if you can discover anything from the snapshot.

Thanks,

Aaron Zimmerman



On Fri, Jul 4, 2014 at 4:02 PM, Jordan Zimmerman <jordan@jordanzimmerman.com
> wrote:

> I’ve seen EOF errors when the 1MB limit has been reached. Check to see if
> any ZNodes have thousands of children and/or big payloads.
>
> -JZ
>
>
> From: Aaron Zimmerman azimmerman@sproutsocial.com
> Reply: user@zookeeper.apache.org user@zookeeper.apache.org
> Date: July 4, 2014 at 8:30:09 AM
> To: user@zookeeper.apache.org user@zookeeper.apache.org
> Subject:  entire cluster dies with EOFException
>
> Hi all,
>
> We have a 5 node zookeeper cluster that has been operating normally for
> several months. Starting a few days ago, the entire cluster crashes a few
> times per day, all nodes at the exact same time. We can't track down the
> exact issue, but deleting the snapshots and logs and restarting resolves.
>
> We are running exhibitor to monitor the cluster.
>
> It appears that something bad gets into the logs, causing an EOFException
> and this cascades through the entire cluster:
>
> 2014-07-04 12:55:26,328 [myid:1] - WARN
> [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:Follower@89] - Exception when
> following the leader
> java.io.EOFException
> at java.io.DataInputStream.readInt(DataInputStream.java:375)
> at
> org.apache.jute.BinaryInputArchive.readInt(BinaryInputArchive.java:63)
> at
> org.apache.zookeeper.server.quorum.QuorumPacket.deserialize(QuorumPacket.java:83)
>
> at
> org.apache.jute.BinaryInputArchive.readRecord(BinaryInputArchive.java:108)
> at
> org.apache.zookeeper.server.quorum.Learner.readPacket(Learner.java:152)
> at
> org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:85)
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:740)
> 2014-07-04 12:55:26,328 [myid:1] - INFO
> [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:Follower@166] - shutdown called
> java.lang.Exception: shutdown Follower
> at
> org.apache.zookeeper.server.quorum.Follower.shutdown(Follower.java:166)
> at
> org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:744)
>
>
> Then the server dies, exhibitor tries to restart each node, and they all
> get stuck trying to replay the bad transaction, logging things like:
>
>
> 2014-07-04 12:58:52,734 [myid:1] - INFO [main:FileSnap@83] - Reading
> snapshot /var/lib/zookeeper/version-2/snapshot.300011fc0
> 2014-07-04 12:58:52,896 [myid:1] - DEBUG
> [main:FileTxnLog$FileTxnIterator@575] - Created new input stream
> /var/lib/zookeeper/version-2/log.300000021
> 2014-07-04 12:58:52,915 [myid:1] - DEBUG
> [main:FileTxnLog$FileTxnIterator@578] - Created new input archive
> /var/lib/zookeeper/version-2/log.300000021
> 2014-07-04 12:59:25,870 [myid:1] - DEBUG
> [main:FileTxnLog$FileTxnIterator@618] - EOF excepton
> java.io.EOFException:
> Failed to read /var/lib/zookeeper/version-2/log.300000021
> 2014-07-04 12:59:25,871 [myid:1] - DEBUG
> [main:FileTxnLog$FileTxnIterator@575] - Created new input stream
> /var/lib/zookeeper/version-2/log.300011fc2
> 2014-07-04 12:59:25,872 [myid:1] - DEBUG
> [main:FileTxnLog$FileTxnIterator@578] - Created new input archive
> /var/lib/zookeeper/version-2/log.300011fc2
> 2014-07-04 12:59:48,722 [myid:1] - DEBUG
> [main:FileTxnLog$FileTxnIterator@618] - EOF excepton
> java.io.EOFException:
> Failed to read /var/lib/zookeeper/version-2/log.300011fc2
>
> And the cluster is dead. The only way we have found to recover is to
> delete all of the data and restart.
>
> Anyone seen this before? Any ideas how I can track down what is causing
> the EOFException, or insulate zookeeper from completely crashing?
>
> Thanks,
>
> Aaron Zimmerman
>
>

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