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Posted to issues@zookeeper.apache.org by "Mate Szalay-Beko (Jira)" <ji...@apache.org> on 2020/05/04 14:09:00 UTC
[jira] [Updated] (ZOOKEEPER-3756) Members failing to rejoin quorum
[ https://issues.apache.org/jira/browse/ZOOKEEPER-3756?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mate Szalay-Beko updated ZOOKEEPER-3756:
----------------------------------------
Issue Type: Bug (was: Improvement)
> Members failing to rejoin quorum
> --------------------------------
>
> Key: ZOOKEEPER-3756
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3756
> Project: ZooKeeper
> Issue Type: Bug
> Components: leaderElection
> Affects Versions: 3.5.6, 3.5.7
> Reporter: Dai Shi
> Assignee: Mate Szalay-Beko
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.6.1, 3.5.8
>
> Attachments: Dockerfile, configmap.yaml, docker-entrypoint.sh, jmx.yaml, zoo-0.log, zoo-1.log, zoo-2.log, zoo-service.yaml, zookeeper.yaml
>
> Time Spent: 3.5h
> Remaining Estimate: 0h
>
> Not sure if this is the place to ask, please close if it's not.
> I am seeing some behavior that I can't explain since upgrading to 3.5:
> In a 5 member quorum, when server 3 is the leader and each server has this in their configuration:
> {code:java}
> server.1=100.71.255.254:2888:3888:participant;2181
> server.2=100.71.255.253:2888:3888:participant;2181
> server.3=100.71.255.252:2888:3888:participant;2181
> server.4=100.71.255.251:2888:3888:participant;2181
> server.5=100.71.255.250:2888:3888:participant;2181{code}
> If servers 1 or 2 are restarted, they fail to rejoin the quorum with this in the logs:
> {code:java}
> 2020-03-11 20:23:35,720 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):QuorumPeer@1175] - LOOKING
> 2020-03-11 20:23:35,721 [myid:2] - INFO [QuorumPeer[myid=2](plain=0.0.0.0:2181)(secure=disabled):FastLeaderElection@885] - New election. My id = 2, proposed zxid=0x1b8005f4bba
> 2020-03-11 20:23:35,733 [myid:2] - INFO [WorkerSender[myid=2]:QuorumCnxManager@438] - Have smaller server identifier, so dropping the connection: (3, 2)
> 2020-03-11 20:23:35,734 [myid:2] - INFO [0.0.0.0/0.0.0.0:3888:QuorumCnxManager$Listener@924] - Received connection request 100.126.116.201:36140
> 2020-03-11 20:23:35,735 [myid:2] - INFO [WorkerSender[myid=2]:QuorumCnxManager@438] - Have smaller server identifier, so dropping the connection: (4, 2)
> 2020-03-11 20:23:35,740 [myid:2] - INFO [WorkerSender[myid=2]:QuorumCnxManager@438] - Have smaller server identifier, so dropping the connection: (5, 2)
> 2020-03-11 20:23:35,740 [myid:2] - INFO [0.0.0.0/0.0.0.0:3888:QuorumCnxManager$Listener@924] - Received connection request 100.126.116.201:36142
> 2020-03-11 20:23:35,740 [myid:2] - INFO [WorkerReceiver[myid=2]:FastLeaderElection@679] - Notification: 2 (message format version), 2 (n.leader), 0x1b8005f4bba (n.zxid), 0x1 (n.round), LOOKING (n.state), 2 (n.sid), 0x1b8 (n.peerEPoch), LOOKING (my state)0 (n.config version)
> 2020-03-11 20:23:35,742 [myid:2] - WARN [SendWorker:3:QuorumCnxManager$SendWorker@1143] - Interrupted while waiting for message on queue
> java.lang.InterruptedException
> at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.reportInterruptAfterWait(AbstractQueuedSynchronizer.java:2014)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2088)
> at java.util.concurrent.ArrayBlockingQueue.poll(ArrayBlockingQueue.java:418)
> at org.apache.zookeeper.server.quorum.QuorumCnxManager.pollSendQueue(QuorumCnxManager.java:1294)
> at org.apache.zookeeper.server.quorum.QuorumCnxManager.access$700(QuorumCnxManager.java:82)
> at org.apache.zookeeper.server.quorum.QuorumCnxManager$SendWorker.run(QuorumCnxManager.java:1131)
> 2020-03-11 20:23:35,744 [myid:2] - WARN [SendWorker:3:QuorumCnxManager$SendWorker@1153] - Send worker leaving thread id 3 my id = 2
> 2020-03-11 20:23:35,745 [myid:2] - WARN [RecvWorker:3:QuorumCnxManager$RecvWorker@1230] - Interrupting SendWorker{code}
> The only way I can seem to get them to rejoin the quorum is to restart the leader.
> However, if I remove server 4 and 5 from the configuration of server 1 or 2 (so only servers 1, 2, and 3 remain in the configuration file), then they can rejoin the quorum fine. Is this expected and am I doing something wrong? Any help or explanation would be greatly appreciated. Thank you.
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