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Posted to jira@kafka.apache.org by "Jonathan Santilli (JIRA)" <ji...@apache.org> on 2018/11/09 20:16:01 UTC
[jira] [Resolved] (KAFKA-4277) creating ephemeral node already
exist
[ https://issues.apache.org/jira/browse/KAFKA-4277?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Santilli resolved KAFKA-4277.
--------------------------------------
Resolution: Duplicate
This is getting closed since KAFKA-7165 have been solved
> creating ephemeral node already exist
> -------------------------------------
>
> Key: KAFKA-4277
> URL: https://issues.apache.org/jira/browse/KAFKA-4277
> Project: Kafka
> Issue Type: Bug
> Components: zkclient
> Affects Versions: 0.10.0.0
> Reporter: Feixiang Yan
> Priority: Major
>
> I use zookeeper 3.4.6.
> Zookeeper session time out, zkClient try reconnect failed. Then re-establish the session and re-registering broker info in ZK, throws NODEEXISTS Exception.
> I think it is because the ephemeral node which created by old session has not removed.
> I read the [ZkUtils.scala|https://github.com/apache/kafka/blob/0.8.1/core/src/main/scala/kafka/utils/ZkUtils.scala] of 0.8.1, createEphemeralPathExpectConflictHandleZKBug try create node in a while loop until create success. This can solve the issue. But in [ZkUtils.scala|https://github.com/apache/kafka/blob/0.10.0.1/core/src/main/scala/kafka/utils/ZkUtils.scala] 0.10.1 the function removed.
> {noformat}
> [2016-10-07 19:00:32,562] INFO Socket connection established to 10.191.155.238/10.191.155.238:21819, initiating session (org.apache.zookeeper.ClientCnxn)
> [2016-10-07 19:00:32,563] INFO zookeeper state changed (Expired) (org.I0Itec.zkclient.ZkClient)
> [2016-10-07 19:00:32,564] INFO Unable to reconnect to ZooKeeper service, session 0x1576b11f9b201bd has expired, closing socket connection (org.apache.zookeeper.ClientCnxn)
> [2016-10-07 19:00:32,564] INFO Initiating client connection, connectString=10.191.155.237:21819,10.191.155.238:21819,10.191.155.239:21819/cluster2 sessionTimeout=6000 watcher=org.I0Itec.zkclient.ZkClient@ae71be2 (org.apache.zookeeper.ZooKeeper)
> [2016-10-07 19:00:32,566] INFO Opening socket connection to server 10.191.155.237/10.191.155.237:21819. Will not attempt to authenticate using SASL (unknown error) (org.apache.zookeeper.ClientCnxn)
> [2016-10-07 19:00:32,566] INFO Socket connection established to 10.191.155.237/10.191.155.237:21819, initiating session (org.apache.zookeeper.ClientCnxn)
> [2016-10-07 19:00:32,566] INFO EventThread shut down (org.apache.zookeeper.ClientCnxn)
> [2016-10-07 19:00:32,567] INFO Session establishment complete on server 10.191.155.237/10.191.155.237:21819, sessionid = 0x1579ecd39c20006, negotiated timeout = 6000 (org.apache.zookeeper.ClientCnxn)
> [2016-10-07 19:00:32,567] INFO zookeeper state changed (SyncConnected) (org.I0Itec.zkclient.ZkClient)
> [2016-10-07 19:00:32,608] INFO re-registering broker info in ZK for broker 3 (kafka.server.KafkaHealthcheck$SessionExpireListener)
> [2016-10-07 19:00:32,610] INFO Creating /brokers/ids/3 (is it secure? false) (kafka.utils.ZKCheckedEphemeral)
> [2016-10-07 19:00:32,611] INFO Result of znode creation is: NODEEXISTS (kafka.utils.ZKCheckedEphemeral)
> [2016-10-07 19:00:32,614] ERROR Error handling event ZkEvent[New session event sent to kafka.server.KafkaHealthcheck$SessionExpireListener@324f1bc] (org.I0Itec.zkclient.ZkEventThread)
> java.lang.RuntimeException: A broker is already registered on the path /brokers/ids/3. This probably indicates that you either have configured a brokerid that is already in use, or else you have shutdown this broker and restarted it faster than the zookeeper timeout so it appears to be re-registering.
> at kafka.utils.ZkUtils.registerBrokerInZk(ZkUtils.scala:305)
> at kafka.utils.ZkUtils.registerBrokerInZk(ZkUtils.scala:291)
> at kafka.server.KafkaHealthcheck.register(KafkaHealthcheck.scala:70)
> at kafka.server.KafkaHealthcheck$SessionExpireListener.handleNewSession(KafkaHealthcheck.scala:104)
> at org.I0Itec.zkclient.ZkClient$6.run(ZkClient.java:735)
> at org.I0Itec.zkclient.ZkEventThread.run(ZkEventThread.java:71)
> {noformat}
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