[jira] [Commented] (KAFKA-3893) Kafka Borker ID disappears from /borkers/ids

["Peter Davis (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-3893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15360306#comment-15360306 ] 

Peter Davis commented on KAFKA-3893:
------------------------------------

Sriharsha, I have witnessed this too and it very much seems like a bug in Kafka -- when a zookeeper connection is lost, any other changes in the cluster during the loss are not recognized when it reconnects.  We see the same loop of "Shrinking ISR" and "Cached zkVerskom [###] not equal to that in zookeeper", and the broker never recovers. 

For us this happened almost daily when running on a cluster virtual machines that would get paused for a few seconds every night for a snapshot backup.  We disabled the backup but it's very concerning that Kafka won't recover after a pause!

> Kafka Borker ID disappears from /borkers/ids
> --------------------------------------------
>
>                 Key: KAFKA-3893
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3893
>             Project: Kafka
>          Issue Type: Bug
>            Reporter: chaitra
>            Priority: Critical
>
> Kafka version used : 0.8.2.1 
> Zookeeper version: 3.4.6
> We have scenario where kafka 's broker in  zookeeper path /brokers/ids just disappears.
> We see the zookeeper connection active and no network issue.
> The zookeeper conection timeout is set to 6000ms in server.properties
> Hence Kafka not participating in cluster



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