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https://issues.apache.org/jira/browse/ZOOKEEPER-2104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15395346#comment-15395346
 ] 

Flavio Junqueira commented on ZOOKEEPER-2104:
---------------------------------------------

[~d.freudenberger] right, 147mb isn't large. But, this indicates that the 
follower has timed out waiting on the leader to sync up:

{noformat}
2016-07-27 11:49:40,346 [myid:2] - WARN 
[QuorumPeer[myid=2]/0:0:0:0:0:0:0:0:2181:Follower@89] - Exception when 
following the leader
java.net.SocketTimeoutException: Read timed out
{noformat}

You may want to have a look at the prospective leader logs to see if you spot 
anything odd. If the log files aren't too large, then you may consider posting 
them here.

Also, is the snapshot you checked the latest one? do all snapshots have roughly 
that size? About devices, are you using a single device or a dedicated device 
to the txn log. 

> Sudden crash of all nodes in the cluster
> ----------------------------------------
>
>                 Key: ZOOKEEPER-2104
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2104
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.4.6
>            Reporter: Benjamin Jaton
>         Attachments: zookeeper-errors.txt, zookeeper-warns.txt
>
>
> In a 3 nodes ensemble, suddenly all the nodes seem to fail, displaying 
> "ZooKeeper is not running" messages.
> Not retry seems to be happening after that.
> This a request to understand what happened and probably to improve the logs 
> when it does.
> See logs below:
> NODE1:
> -- no log for several days before this --
> 2015-01-04 16:18:22,259 [myid:1] - WARN  [SyncThread:1:FileTxnLog@321] - 
> fsync-ing the write ahead log in SyncThread:1 took 11024ms which will 
> adversely effect operation latency. See the ZooKeeper troubleshooting guide
> 2015-01-04 16:18:22,380 [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:392)
>         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:103)
>         at 
> org.apache.zookeeper.server.quorum.Learner.readPacket(Learner.java:153)
>         at 
> org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:85)
>         at 
> org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:786)
> 2015-01-04 16:18:23,384 [myid:1] - WARN  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@362] - Exception 
> causing close of session 0x0 due to java.io.IOException: ZooKeeperServer not 
> running
> 2015-01-04 16:18:23,492 [myid:1] - WARN  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@362] - Exception 
> causing close of session 0x0 due to java.io.IOException: ZooKeeperServer not 
> running
> 2015-01-04 16:18:24,060 [myid:1] - WARN  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@362] - Exception 
> causing close of session 0x0 due to java.io.IOException: ZooKeeperServer not 
> running
> NODE2:
> -- no log for several days before this --
> 2015-01-04 16:18:21,899 [myid:3] - WARN  
> [QuorumPeer[myid=3]/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:392)
>         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:103)
>         at 
> org.apache.zookeeper.server.quorum.Learner.readPacket(Learner.java:153)
>         at 
> org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:85)
>         at 
> org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:786)
> 2015-01-04 16:18:22,760 [myid:3] - WARN  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@362] - Exception 
> causing close of session 0x0 due to java.io.IOException: ZooKeeperServer not 
> running
> 2015-01-04 16:18:22,801 [myid:3] - WARN  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@362] - Exception 
> causing close of session 0x0 due to java.io.IOException: ZooKeeperServer not 
> running
> 2015-01-04 16:18:22,886 [myid:3] - WARN  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@362] - Exception 
> causing close of session 0x0 due to java.io.IOException: ZooKeeperServer not 
> running
> NODE3 (leader):
> -- no log for several days before this --
> 2015-01-04 16:18:21,897 [myid:2] - WARN  
> [QuorumPeer[myid=2]/0:0:0:0:0:0:0:0:2181:LearnerHandler@687] - Closing 
> connection to peer due to transaction timeout.
> 2015-01-04 16:18:21,898 [myid:2] - WARN  
> [LearnerHandler-/204.53.107.249:43402:LearnerHandler@646] - ******* GOODBYE 
> /204.53.107.249:43402 ********
> 2015-01-04 16:18:21,905 [myid:2] - WARN  
> [QuorumPeer[myid=2]/0:0:0:0:0:0:0:0:2181:LearnerHandler@687] - Closing 
> connection to peer due to transaction timeout.
> 2015-01-04 16:18:21,907 [myid:2] - WARN  
> [LearnerHandler-/204.53.107.247:45953:LearnerHandler@646] - ******* GOODBYE 
> /204.53.107.247:45953 ********
> 2015-01-04 16:18:21,918 [myid:2] - WARN  
> [LearnerHandler-/204.53.107.247:45953:LearnerHandler@658] - Ignoring 
> unexpected exception
> java.lang.InterruptedException
>         at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireInterruptibly(AbstractQueuedSynchronizer.java:1219)
>         at 
> java.util.concurrent.locks.ReentrantLock.lockInterruptibly(ReentrantLock.java:340)
>         at 
> java.util.concurrent.LinkedBlockingQueue.put(LinkedBlockingQueue.java:338)
>         at 
> org.apache.zookeeper.server.quorum.LearnerHandler.shutdown(LearnerHandler.java:656)
>         at 
> org.apache.zookeeper.server.quorum.LearnerHandler.run(LearnerHandler.java:649)
> 2015-01-04 16:18:23,003 [myid:2] - WARN  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@362] - Exception 
> causing close of session 0x0 due to java.io.IOException: ZooKeeperServer not 
> running
> 2015-01-04 16:18:23,007 [myid:2] - WARN  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@362] - Exception 
> causing close of session 0x0 due to java.io.IOException: ZooKeeperServer not 
> running
> 2015-01-04 16:18:23,115 [myid:2] - WARN  
> [NIOServerCxn.Factory:0.0.0.0/0.0.0.0:2181:NIOServerCnxn@362] - Exception 
> causing close of session 0x0 due to java.io.IOException: ZooKeeperServer not 
> running



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