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From Flavio Junqueira <fpjunque...@yahoo.com.INVALID>
Subject Re: entire cluster dies with EOFException
Date Sun, 06 Jul 2014 22:30:59 GMT
That's a good point, some znodes in the snapshot Aaron shared have over 400k bytes. There are
some znodes with tens of kbytes too. 

Given that we are giving hints about the config parameters, it'd be nice if we could see the
config file.

-Flavio

On 06 Jul 2014, at 22:34, Benjamin Reed <breed@apache.org> wrote:

> the log files seem very large to me. is the snap count really large? or do
> you have a lot of data in each znode? you might try reducing the snap count
> to make the log files smaller.
> On Jul 6, 2014 2:27 PM, "Flavio Junqueira" <fpjunqueira@yahoo.com.invalid>
> wrote:
> 
>> But what is it that was causing problems in your scenario, Raul? Is it
>> reading the log? In any case, it sounds like initLimit is the parameter you
>> want to change, no?
>> 
>> -Flavio
>> 
>> On 06 Jul 2014, at 19:09, Raúl Gutiérrez Segalés <rgs@itevenworks.net>
>> wrote:
>> 
>>> Oh, storm right. Yeah I've seen this. The transaction rate is so huge the
>>> the initial sync fails.. perhaps you could try bigger tickTime, initLimit
>>> and syncLimit params...
>>> 
>>> 
>>> -rgs
>>> 
>>> 
>>> On 6 July 2014 04:48, Aaron Zimmerman <azimmerman@sproutsocial.com>
>> wrote:
>>> 
>>>> Raúl,
>>>> 
>>>> zk_approximate_data_size 4899392
>>>> 
>>>> That is about the size of the snapshots also.
>>>> 
>>>> Benjamin,
>>>> 
>>>> We are not running out of disk space.
>>>> But the log.XXXX files are quite large, is this normal?  In less than 3
>>>> hours, the log file since the last snapshot is 8.2G, and the older log
>>>> files are as large as 12G.
>>>> 
>>>> We are using Storm Trident, this uses zookeeper pretty heavily for
>> tracking
>>>> transactional state, but i'm not sure if that could account for this
>> much
>>>> storage.  Is there an easy way to track which znodes are being updated
>> most
>>>> frequently?
>>>> 
>>>> Thanks,
>>>> 
>>>> Aaron
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> On Sun, Jul 6, 2014 at 1:55 AM, Raúl Gutiérrez Segalés <
>>>> rgs@itevenworks.net>
>>>> wrote:
>>>> 
>>>>> What's the total size of the data in your ZK cluster? i.e.:
>>>>> 
>>>>> $ echo mntr | nc localhost 2181 | grep zk_approximate_data_size
>>>>> 
>>>>> And/or the size of the snapshot?
>>>>> 
>>>>> 
>>>>> -rgs
>>>>> 
>>>>> 
>>>>> On 4 July 2014 06:29, Aaron Zimmerman <azimmerman@sproutsocial.com>
>>>> wrote:
>>>>> 
>>>>>> 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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