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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5985) Mention the need to close store iterators
Date Fri, 29 Sep 2017 16:41:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5985?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16186059#comment-16186059

ASF GitHub Bot commented on KAFKA-5985:

GitHub user bbejeck opened a pull request:


    KAFKA-5985: update javadoc regarding closing iterators


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/bbejeck/kafka KAFKA-5985_document_need_to_close_iterators

Alternatively you can review and apply these changes as the patch at:


To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #3994
commit 36493a6313766211d53ea0986e216ae7aa1e6029
Author: Bill Bejeck <bill@confluent.io>
Date:   2017-09-29T16:39:36Z

    KAFKA-5985: update javadoc regarding closing iterators


> Mention the need to close store iterators
> -----------------------------------------
>                 Key: KAFKA-5985
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5985
>             Project: Kafka
>          Issue Type: Improvement
>          Components: documentation, streams
>    Affects Versions:
>            Reporter: Stanislav Chizhov
>            Assignee: Bill Bejeck
> Store iterators should be closed in all/most of the cases, but currently it is not consistently
reflected in the documentation and javadocs. For instance  https://kafka.apache.org/0110/documentation/streams/developer-guide#streams_developer-guide_interactive-queries_custom-stores
does not mention the need to close an iterator and provide an example that does not do that.

> Some of the fetch methods do mention the need to close an iterator returned (e.g. https://kafka.apache.org/0110/javadoc/org/apache/kafka/streams/state/ReadOnlyKeyValueStore.html#range(K,%20K)),
but others do not: https://kafka.apache.org/0110/javadoc/org/apache/kafka/streams/state/ReadOnlyWindowStore.html#fetch(K,%20long,%20long)
> It makes sense to: 
> - update javadoc for all store methods that do return iterators to reflect that the iterator
returned needs to be closed
> - mention it in the documentation and to update related examples.

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