[ 
https://issues.apache.org/jira/browse/ZOOKEEPER-483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12744165#action_12744165
 ] 

Mahadev konar commented on ZOOKEEPER-483:
-----------------------------------------

also, ben I think we should create a seperate jira for truncate and link it to 
this. We dont have to upload seperate patches, but just for accounting sakes.

> ZK fataled on me, and ugly
> --------------------------
>
>                 Key: ZOOKEEPER-483
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-483
>             Project: Zookeeper
>          Issue Type: Bug
>    Affects Versions: 3.1.1
>            Reporter: ryan rawson
>            Assignee: Benjamin Reed
>             Fix For: 3.2.1, 3.3.0
>
>         Attachments: QuorumTest.log, QuorumTest.log.gz, zklogs.tar.gz, 
> ZOOKEEPER-483.patch, ZOOKEEPER-483.patch, ZOOKEEPER-483.patch, 
> ZOOKEEPER-483.patch
>
>
> here are the part of the log whereby my zookeeper instance crashed, taking 3 
> out of 5 down, and thus ruining the quorum for all clients:
> 2009-07-23 12:29:06,769 WARN org.apache.zookeeper.server.NIOServerCnxn: 
> Exception causing close of session 0x52276d1d5161350 due to 
> java.io.IOException: Read error
> 2009-07-23 12:29:00,756 WARN org.apache.zookeeper.server.quorum.Follower: 
> 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:65)
>         at 
> org.apache.jute.BinaryInputArchive.readRecord(BinaryInputArchive.java:108)
>         at 
> org.apache.zookeeper.server.quorum.Follower.readPacket(Follower.java:114)
>         at 
> org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:243)
>         at 
> org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:494)
> 2009-07-23 12:29:06,770 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x52276d1d5161350 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.168:39489]
> 2009-07-23 12:29:06,770 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x12276d15dfb0578 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.159:46797]
> 2009-07-23 12:29:06,771 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x42276d1d3fa013e NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.153:33998]
> 2009-07-23 12:29:06,771 WARN org.apache.zookeeper.server.NIOServerCnxn: 
> Exception causing close of session 0x52276d1d5160593 due to 
> java.io.IOException: Read error
> 2009-07-23 12:29:06,808 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x32276d15d2e02bb NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.158:53758]
> 2009-07-23 12:29:06,809 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x42276d1d3fa13e4 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.154:58681]
> 2009-07-23 12:29:06,809 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e691382 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.162:59967]
> 2009-07-23 12:29:06,809 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x12276d15dfb1354 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.163:49957]
> 2009-07-23 12:29:06,809 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x42276d1d3fa13cd NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.150:34212]
> 2009-07-23 12:29:06,809 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e691383 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.159:46813]
> 2009-07-23 12:29:06,809 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x12276d15dfb0350 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.162:59956]
> 2009-07-23 12:29:06,809 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x32276d15d2e139b NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.156:55138]
> 2009-07-23 12:29:06,809 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x32276d15d2e1398 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.167:41257]
> 2009-07-23 12:29:06,810 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x52276d1d5161355 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.153:34032]
> 2009-07-23 12:29:06,810 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x52276d1d516011c NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.155:56314]
> 2009-07-23 12:29:06,810 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x32276d15d2e056b NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.155:56322]
> 2009-07-23 12:29:06,810 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x52276d1d516011f NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.157:49618]
> 2009-07-23 12:29:06,810 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x32276d15d2e11ea NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.10.20.42:55483]
> 2009-07-23 12:29:06,810 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x32276d15d2e02ba NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.157:49632]
> 2009-07-23 12:29:06,810 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x12276d15dfb1355 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.169:58824]
> 2009-07-23 12:29:06,810 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e691378 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.161:40973]
> 2009-07-23 12:29:06,811 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e691380 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.162:59944]
> 2009-07-23 12:29:06,811 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x32276d15d2e0311 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.160:56167]
> 2009-07-23 12:29:06,811 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e690374 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.169:58815]
> 2009-07-23 12:29:06,811 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x32276d15d2e139f NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.151:51396]
> 2009-07-23 12:29:06,811 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x32276d15d2e139c NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.155:56315]
> 2009-07-23 12:29:06,811 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e69137b NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.162:59859]
> 2009-07-23 12:29:06,811 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x52276d1d5160594 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.151:51370]
> 2009-07-23 12:29:06,811 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e69137a NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.159:46682]
> 2009-07-23 12:29:06,812 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x52276d1d5160347 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.165:35722]
> 2009-07-23 12:29:06,812 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e69137f NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.159:46754]
> 2009-07-23 12:29:06,812 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x52276d1d5160121 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.155:56307]
> 2009-07-23 12:29:06,812 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x12276d15dfb0126 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.154:58688]
> 2009-07-23 12:29:06,812 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x42276d1d3fa05fc NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.152:45067]
> 2009-07-23 12:29:06,812 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x32276d15d2e0316 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.169:58800]
> 2009-07-23 12:29:06,812 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e69137e NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.159:46737]
> 2009-07-23 12:29:06,813 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e69137d NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.159:46733]
> 2009-07-23 12:29:06,813 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x42276d1d3fa13df NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.156:55137]
> 2009-07-23 12:29:06,813 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x12276d15dfb134e NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.166:40443]
> 2009-07-23 12:29:06,813 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e691381 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.161:41086]
> 2009-07-23 12:29:06,813 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x52276d1d5161356 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.165:35719]
> 2009-07-23 12:29:06,813 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x12276d15dfb1349 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 remote=/10.
> 20.20.158:53770]
> 2009-07-23 12:29:06,813 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x12276d15dfb0352 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.165:35718]
> 2009-07-23 12:29:06,813 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e691379 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.162:59823]
> 2009-07-23 12:29:06,814 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x52276d1d516000e NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.150:34216]
> 2009-07-23 12:29:06,814 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x32276d15d2e1397 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.169:58829]
> 2009-07-23 12:29:06,814 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e69137c NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.162:59862]
> 2009-07-23 12:29:06,814 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x42276d1d3fa0140 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.155:56271]
> 2009-07-23 12:29:06,814 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x42276d1d3fa13e1 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.157:49608]
> 2009-07-23 12:29:06,814 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x22276d15e691377 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.162:59789]
> 2009-07-23 12:29:06,814 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x52276d1d5160593 NIOServerCnxn: 
> java.nio.channels.SocketChannel[connected local=/10.20.20.151:2181 
> remote=/10.20.20.165:35703]
> 2009-07-23 12:29:06,814 INFO 
> org.apache.zookeeper.server.FinalRequestProcessor: shutdown of request 
> processor complete
> 2009-07-23 12:29:06,814 INFO 
> org.apache.zookeeper.server.quorum.FollowerRequestProcessor: 
> FollowerRequestProcessor exited loop!
> 2009-07-23 12:29:06,814 INFO 
> org.apache.zookeeper.server.quorum.CommitProcessor: CommitProcessor exited 
> loop!
> 2009-07-23 12:29:06,815 INFO org.apache.zookeeper.server.quorum.Follower: 
> shutdown called
> java.lang.Exception: shutdown Follower
>         at 
> org.apache.zookeeper.server.quorum.Follower.shutdown(Follower.java:427)
>         at 
> org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:498)
> 2009-07-23 12:29:06,815 WARN org.apache.zookeeper.server.NIOServerCnxn: 
> Ignoring exception
> java.nio.channels.CancelledKeyException
>         at sun.nio.ch.SelectionKeyImpl.ensureValid(SelectionKeyImpl.java:55)
>         at sun.nio.ch.SelectionKeyImpl.readyOps(SelectionKeyImpl.java:69)
>         at 
> org.apache.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:201)
> 2009-07-23 12:29:06,815 INFO org.apache.zookeeper.server.quorum.QuorumPeer: 
> LOOKING
> 2009-07-23 12:29:06,817 WARN org.apache.zookeeper.server.NIOServerCnxn: 
> Exception causing close of session 0x0 due to java.io.IOException: 
> ZooKeeperServer not running
> 2009-07-23 12:29:06,817 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x0 NIOServerCnxn: java.nio.channels.SocketChannel[connected 
> local=/10.20.20.151:2181 remote=/10.20.20.156:55206]
> 2009-07-23 12:29:06,818 WARN org.apache.zookeeper.server.NIOServerCnxn: 
> Exception causing close of session 0x0 due to java.io.IOException: 
> ZooKeeperServer not running
> 2009-07-23 12:29:06,818 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x0 NIOServerCnxn: java.nio.channels.SocketChannel[connected 
> local=/10.20.20.151:2181 remote=/10.20.20.155:56331]
> [elided lots of the same]
> 2009-07-23 12:29:33,008 INFO org.apache.zookeeper.server.NIOServerCnxn: 
> closing session:0x0 NIOServerCnxn: java.nio.channels.SocketChannel[connected 
> local=/10.20.20.151:2181 remote=/10.20.20.152:5945
> 8]
> 2009-07-23 12:29:33,011 FATAL 
> org.apache.zookeeper.server.SyncRequestProcessor: Severe unrecoverable error, 
> exiting
> java.net.SocketException: Socket closed
>         at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:99)
>         at java.net.SocketOutputStream.write(SocketOutputStream.java:136)
>         at 
> java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
>         at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
>         at 
> org.apache.zookeeper.server.quorum.Follower.writePacket(Follower.java:100)
>         at 
> org.apache.zookeeper.server.quorum.SendAckRequestProcessor.flush(SendAckRequestProcessor.java:52)
>         at 
> org.apache.zookeeper.server.SyncRequestProcessor.flush(SyncRequestProcessor.java:131)
>         at 
> org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:76)
> The good news is when I restarted the downed zookeepers, everything returned 
> to normal.

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