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From "Akihiro Suda (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ZOOKEEPER-2162) infinite exception loop occurs when dataDir is lost
Date Mon, 02 Nov 2015 07:37:27 GMT

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-2162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14984841#comment-14984841
] 

Akihiro Suda commented on ZOOKEEPER-2162:
-----------------------------------------

Hi [~arshad.mohammad], thank you for the response.
I'll try it this week.


> infinite exception loop occurs when dataDir is lost
> ---------------------------------------------------
>
>                 Key: ZOOKEEPER-2162
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2162
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.5.0
>            Reporter: Akihiro Suda
>         Attachments: ZOOKEEPER-2162.patch
>
>
> This sequence leads server.1 and server.2 to infinite exception loop.
>  * Start server.1 and server.2 with the initial ensemble server.1=participant, server.2=observer.
>    In this time, acceptedEpoch\[i\] == currentEpoch\[i\] == 1 for i = 1, 2.
>  * Invoke reconfig so that acceptedEpoch\[i\] and currentEpoch\[i\] grows up to 2.
>  * Kill server.2
>  * Remove dataDir of server.2 excluding the myid file.
>    (In real production environments, both of confDir and dataDir can be lost due to reprovisioning)
>  * Start server.2
>  * server.1 and server.2 enters infinite exception loop.
>    The log (threshold is set to INFO in log4j.properties) size can reach > 100MB in
30 seconds.
> AFAIK, the bug can be reproduced with ZooKeeper@f5fb50ed2591ba9a24685a227bb5374759516828
(Apr 7, 2015).
> I made a Docker container so that people who are interested can reproduce the bug easily.
(Sorry for no JUnit test right now)
> {noformat}
> $ docker run -i -t --rm akihirosuda/zookeeper-bug01
> Reproducing the bug: infinite exception loop occurs when dataDir is lost
> * Resetting
> * Starting [1,2] with the initial ensemble [1]
> * Sleeping for 3 seconds
> * Invoking Reconfig [1]->[2]
> * Sleeping for 3 seconds
> * Killing server.2 (pid=10542)
> * Sleeping for 3 seconds
> * Resetting /zk02_data
> * Starting server.2
> * Sleeping for 30 seconds
> /zk01_log: 81665114 bytes
> The log dir is extremely large. Perhaps the bug was REPRODUCED!
> /zk02_log: 23949367 bytes
> The log dir is extremely large. Perhaps the bug was REPRODUCED!
> * Exiting
> {noformat}
> h2. Log
> h3. server.1
> {noformat}
>     2015-04-13 03:48:17,624 [myid:1] - INFO  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):QuorumPeer@1022]
- FOLLOWING
>     2015-04-13 03:48:17,624 [myid:1] - INFO  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):ZooKeeperServer@825]
- minSessionTimeout set to 4000
>     2015-04-13 03:48:17,624 [myid:1] - INFO  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):ZooKeeperServer@834]
- maxSessionTimeout set to 40000
>     2015-04-13 03:48:17,624 [myid:1] - INFO  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):ZooKeeperServer@156]
- Created server with tickTime 2000 minSession
>     Timeout 4000 maxSessionTimeout 40000 datadir /zk01_data/version-2 snapdir /zk01_data/version-2
>     2015-04-13 03:48:17,624 [myid:1] - INFO  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):Follower@66]
- FOLLOWING - LEADER ELECTION TOOK - 0
>     2015-04-13 03:48:17,625 [myid:1] - WARN  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):Follower@93]
- Exception when following the leader
>     java.io.IOException: Leaders epoch, 1 is less than accepted epoch, 2
>             at org.apache.zookeeper.server.quorum.Learner.registerWithLeader(Learner.java:331)
>             at org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:75)
>             at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1024)
>     2015-04-13 03:48:17,626 [myid:1] - INFO  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):MBeanRegistry@119]
- Unregister MBean [org.apache.ZooKeeperService:
>     name0=ReplicatedServer_id1,name1=replica.1,name2=Follower]
>     2015-04-13 03:48:17,626 [myid:1] - INFO  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):Follower@198]
- shutdown called
>     java.lang.Exception: shutdown Follower
>             at org.apache.zookeeper.server.quorum.Follower.shutdown(Follower.java:198)
>             at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1028)
>     2015-04-13 03:48:17,626 [myid:1] - DEBUG [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):LearnerZooKeeperServer@162]
- ZooKeeper server is not running, so n
>     ot proceeding to shutdown!
>     2015-04-13 03:48:17,626 [myid:1] - WARN  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):QuorumPeer@1071]
- PeerState set to LOOKING
>     2015-04-13 03:48:17,626 [myid:1] - INFO  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):QuorumPeer@946]
- LOOKING
>     2015-04-13 03:48:17,626 [myid:1] - DEBUG [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):QuorumPeer@875]
- Initializing leader election protocol...
>     2015-04-13 03:48:17,626 [myid:1] - DEBUG [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):FastLeaderElection@790]
- Updating proposal: -9223372036854775808 (
>     newleader), 0x100000002 (newzxid), -9223372036854775808 (oldleader), 0x100000002
(oldzxid)
>     2015-04-13 03:48:17,626 [myid:1] - INFO  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):FastLeaderElection@889]
- New election. My id =  1, proposed zxid=0
>     x100000002
>     2015-04-13 03:48:17,626 [myid:1] - DEBUG [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):FastLeaderElection@673]
- Sending Notification: -922337203685477580
>     8 (n.leader), 0x100000002 (n.zxid), 0x2 (n.round), 2 (recipient), 1 (myid), 0x2 (n.peerEpoch)
>     2015-04-13 03:48:17,626 [myid:1] - DEBUG [WorkerSender[myid=1]:QuorumCnxManager@400]
- There is a connection already for server 2
>     2015-04-13 03:48:17,627 [myid:1] - DEBUG [WorkerReceiver[myid=1]:FastLeaderElection$Messenger$WorkerReceiver@336]
- Receive new notification message. My id = 1
>     2015-04-13 03:48:17,627 [myid:1] - INFO  [WorkerReceiver[myid=1]:FastLeaderElection@683]
- Notification: 2 (message format version), 2 (n.leader), 0x0 (n.zxid), 0x1 (n.round)
>     , LEADING (n.state), 2 (n.sid), 0x1 (n.peerEPoch), LOOKING (my state)100000002 (n.config
version)
>     2015-04-13 03:48:17,627 [myid:1] - DEBUG [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):FastLeaderElection@812]
- I'm a participant: 1
>     2015-04-13 03:48:17,627 [myid:1] - DEBUG [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):FastLeaderElection@637]
- About to leave FLE instance: leader=2, zx
>     id=0x0, my id=1, my state=FOLLOWING
>     2015-04-13 03:48:17,627 [myid:1] - INFO  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):MBeanRegistry@119]
- Unregister MBean [org.apache.ZooKeeperService:
>     name0=ReplicatedServer_id1,name1=replica.1,name2=LeaderElection]
>     2015-04-13 03:48:17,627 [myid:1] - INFO  [QuorumPeer[myid=1](plain=/0:0:0:0:0:0:0:0:2181)(secure=disabled):QuorumPeer@1022]
- FOLLOWING
>     ..
> {noformat}    
> h3. server.2
> {noformat}
>     2015-04-13 03:48:17,672 [myid:2] - ERROR [LearnerHandler-/127.0.0.1:36337:LearnerHandler@580]
- Unexpected exception causing shutdown while sock still open
>     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:99)
>             at org.apache.zookeeper.server.quorum.LearnerHandler.run(LearnerHandler.java:392)
>     2015-04-13 03:48:17,672 [myid:2] - WARN  [LearnerHandler-/127.0.0.1:36337:LearnerHandler@595]
- ******* GOODBYE /127.0.0.1:36337 ********
>     2015-04-13 03:48:17,674 [myid:2] - DEBUG [WorkerSender[myid=2]:QuorumCnxManager@400]
- There is a connection already for server 1
>     2015-04-13 03:48:17,676 [myid:2] - INFO  [LearnerHandler-/127.0.0.1:36338:LearnerHandler@364]
- Follower sid: 1 not in the current config 100000002
>     2015-04-13 03:48:17,676 [myid:2] - ERROR [LearnerHandler-/127.0.0.1:36338:LearnerHandler@580]
- Unexpected exception causing shutdown while sock still open
>     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:99)
>             at org.apache.zookeeper.server.quorum.LearnerHandler.run(LearnerHandler.java:392)
>     2015-04-13 03:48:17,677 [myid:2] - WARN  [LearnerHandler-/127.0.0.1:36338:LearnerHandler@595]
- ******* GOODBYE /127.0.0.1:36338 ********
>     ..
> {noformat}



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