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https://issues.apache.org/jira/browse/FLINK-2054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14576817#comment-14576817
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ASF GitHub Bot commented on FLINK-2054:
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GitHub user aljoscha opened a pull request:
https://github.com/apache/flink/pull/803
[FLINK-2054] Add object-reuse switch for streaming
The switch was already there: enableObjectReuse() in ExecutionConfig.
This was simply not considered by the streaming runtime. This change now
draws a copy before forwarding an element to a chained operator when
object reuse is disabled.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/aljoscha/flink streaming-reuse-switch
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/803.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 #803
----
commit c1896ef6355f47f89215acff7eba9f944c461196
Author: Aljoscha Krettek <aljoscha.kret...@gmail.com>
Date: 2015-06-08T09:32:27Z
[FLINK-2054] Add object-reuse switch for streaming
The switch was already there: enableObjectReuse() in ExecutionConfig.
This was simply not considered by the streaming runtime. This change now
draws a copy before forwarding an element to a chained operator when
object reuse is disabled.
----
> StreamOperator rework removed copy calls when passing output to a chained
> operator
> ----------------------------------------------------------------------------------
>
> Key: FLINK-2054
> URL: https://issues.apache.org/jira/browse/FLINK-2054
> Project: Flink
> Issue Type: Bug
> Components: Streaming
> Reporter: Gyula Fora
> Assignee: Aljoscha Krettek
> Priority: Blocker
>
> Before the recent rework of stream operators to be push based, operators held
> the semantics that any input (and also output to be specific) will not be
> mutated afterwards. This was achieved by simply copying records that were
> passed to other chained operators.
> This feature has been removed thus introducing a major break in the operator
> mutability guarantees.
> To make chaining viable in all cases (and to prevent hidden bugs) we need to
> reintroduce the copying logic.
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