[jira] [Assigned] (KAFKA-3559) Task creation time taking too long in rebalance callback

["Eno Thereska (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-3559?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eno Thereska reassigned KAFKA-3559:
-----------------------------------

    Assignee: Eno Thereska

> Task creation time taking too long in rebalance callback
> --------------------------------------------------------
>
>                 Key: KAFKA-3559
>                 URL: https://issues.apache.org/jira/browse/KAFKA-3559
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>            Reporter: Guozhang Wang
>            Assignee: Eno Thereska
>              Labels: architecture
>             Fix For: 0.10.0.0
>
>
> Currently in Kafka Streams, we create stream tasks upon getting newly assigned partitions in rebalance callback function {code} onPartitionAssigned {code}, which involves initialization of the processor state stores as well (including opening the rocksDB, restore the store from changelog, etc, which takes time).
> With a large number of state stores, the initialization time itself could take tens of seconds, which usually is larger than the consumer session timeout. As a result, when the callback is completed, the consumer is already treated as failed by the coordinator and rebalance again.
> We need to consider if we can optimize the initialization process, or move it out of the callback function, and while initializing the stores one-by-one, use poll call to send heartbeats to avoid being kicked out by coordinator.



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