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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-6499) Avoid creating dummy checkpoint files with no state stores
Date Wed, 31 Jan 2018 01:13:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-6499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16346085#comment-16346085

ASF GitHub Bot commented on KAFKA-6499:

guozhangwang opened a new pull request #4492: KAFKA-6499: Do not write offset checkpoint file
with empty offset map
URL: https://github.com/apache/kafka/pull/4492
   * In Checkpoint.write(), if the offset map passed in is empty, skip the writing of the
file which would only contain version number and the empty size. From the reading pov, it
is the same as no file existed.
   * Add related unit tests.
   * Minor fixes on log4j messages.
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)

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> Avoid creating dummy checkpoint files with no state stores
> ----------------------------------------------------------
>                 Key: KAFKA-6499
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6499
>             Project: Kafka
>          Issue Type: Improvement
>          Components: streams
>            Reporter: Guozhang Wang
>            Priority: Major
> Today, for a streams task that contains no state stores, its processor state manager
would still write a dummy checkpoint file that contains some characters (version, size). This
introduces unnecessary disk IOs and should be avoidable.

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