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Posted to dev@zookeeper.apache.org by "Arshad Mohammad (JIRA)" <ji...@apache.org> on 2015/11/02 08:23:27 UTC
[jira] [Commented] (ZOOKEEPER-2162) infinite exception loop occurs
when dataDir is lost
[ https://issues.apache.org/jira/browse/ZOOKEEPER-2162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14984820#comment-14984820 ]
Arshad Mohammad commented on ZOOKEEPER-2162:
--------------------------------------------
Hi [~suda], Can you submit a JUnit test patch.
> 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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