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https://issues.apache.org/jira/browse/KAFKA-3559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15616983#comment-15616983
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ASF GitHub Bot commented on KAFKA-3559:
---------------------------------------
GitHub user enothereska reopened a pull request:
https://github.com/apache/kafka/pull/2032
KAFKA-3559: Recycle old tasks when possible
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/enothereska/kafka
KAFKA-3559-onPartitionAssigned
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/2032.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2032
----
commit 28a50430e4136ba75f0d9b957a67f22e7b1e86a0
Author: Eno Thereska <eno.there...@gmail.com>
Date: 2016-10-17T10:46:45Z
Recycle old tasks when possible
commit b3dc438bf1665b9364b19f5efa908dd35d2b7af3
Author: Eno Thereska <eno.there...@gmail.com>
Date: 2016-10-19T15:13:36Z
Adjusted based on Damian's comments
commit f8cfe74d85e0a8cd5efacca87eced236319c83b9
Author: Eno Thereska <eno.there...@gmail.com>
Date: 2016-10-19T17:44:39Z
Refactor
commit 62bb3fd4a90dd28bc7bb58bf077b7ecb60207c7e
Author: Eno Thereska <eno.there...@gmail.com>
Date: 2016-10-24T14:24:48Z
Merge remote-tracking branch 'origin/trunk' into
KAFKA-3559-onPartitionAssigned
commit 841caa3721172d2d89ec16ef6dfd149f25498649
Author: Eno Thereska <eno.there...@gmail.com>
Date: 2016-10-24T17:32:05Z
Addressed Guozhang's comments
commit c4498564907243c35df832407933b8a9cf32f4ef
Author: Eno Thereska <eno.there...@gmail.com>
Date: 2016-10-25T11:07:28Z
Refactor
commit 4ba24c1ecb8c6293adce426a92b6021e86c9e8b7
Author: Eno Thereska <eno.there...@gmail.com>
Date: 2016-10-25T12:20:04Z
Merge remote-tracking branch 'origin/trunk' into
KAFKA-3559-onPartitionAssigned
commit 0fe12633b8593eda3b5b7b75bc87244276c95ce2
Author: Eno Thereska <eno.there...@gmail.com>
Date: 2016-10-28T20:46:18Z
Minor reshuffle
commit 7bf5d96cd66ab77130cad39fbff821fccd83aa06
Author: Eno Thereska <eno.there...@gmail.com>
Date: 2016-10-28T21:44:48Z
Guozhang's suggestion to clear queue
----
> 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: Improvement
> Components: streams
> Reporter: Guozhang Wang
> Assignee: Eno Thereska
> Labels: architecture
> Fix For: 0.10.2.0
>
>
> 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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