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https://issues.apache.org/jira/browse/KAFKA-8716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16893977#comment-16893977
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Jun Rao commented on KAFKA-8716:
--------------------------------
Hmm, that's kind of weird. We do wait for the ZK session to be connected in the
constructor of ZooKeeperClient.
{code:java}
try waitUntilConnected(connectionTimeoutMs, TimeUnit.MILLISECONDS)
catch {
case e: Throwable =>
close()
throw e
}
{code}
It should be rare for the session to be expired immediately after the
connection is established. Could you turn on the debug level logging in
ZooKeeperClientWatcher so that we can see logs like the following?
{code:java}
debug(s"Received event: $event"){code}
> broker cannot join the cluster after upgrading kafka binary from 2.1.1 to
> 2.2.1 or 2.3.0
> ----------------------------------------------------------------------------------------
>
> Key: KAFKA-8716
> URL: https://issues.apache.org/jira/browse/KAFKA-8716
> Project: Kafka
> Issue Type: Bug
> Components: zkclient
> Affects Versions: 2.3.0, 2.2.1
> Reporter: Yu Yang
> Priority: Critical
>
> We are trying to upgrade kafka binary from 2.1 to 2.2.1 or 2.3.0. For both
> versions, the broker with updated binary (2.2.1 or 2.3.0) could not get
> started due to zookeeper session expiration exception. This error happens
> repeatedly and the broker could not start because of this.
> Below is our zk related setting in server.properties:
> {code}
> zookeeper.connection.timeout.ms=6000
> zookeeper.session.timeout.ms=6000
> {code}
> The following is the stack trace, and we are using zookeeper 3.5.3. Instead
> of waiting for a few seconds, the SESSIONEXPIRED error returned immediately
> in CheckedEphemeral.create call. Any insights?
> [2019-07-25 18:07:35,712] INFO Creating /brokers/ids/80 (is it secure? false)
> (kafka.zk.KafkaZkClient)
> [2019-07-25 18:07:35,724] ERROR Error while creating ephemeral at
> /brokers/ids/80 with return code: SESSIONEXPIRED
> (kafka.zk.KafkaZkClient$CheckedEphemeral)
> [2019-07-25 18:07:35,731] ERROR [KafkaServer id=80] Fatal error during
> KafkaServer startup. Prepare to shutdown (kafka.server.KafkaServer)
> org.apache.zookeeper.KeeperException$SessionExpiredException: KeeperErrorCode
> = Session expired
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:130)
> at kafka.zk.KafkaZkClient$CheckedEphemeral.create(KafkaZkClient.scala:1725)
> at kafka.zk.KafkaZkClient.checkedEphemeralCreate(KafkaZkClient.scala:1689)
> at kafka.zk.KafkaZkClient.registerBroker(KafkaZkClient.scala:97)
> at kafka.server.KafkaServer.startup(KafkaServer.scala:260)
> at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:38)
> at kafka.Kafka$.main(Kafka.scala:75)
> at kafka.Kafka.main(Kafka.scala)
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