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https://issues.apache.org/jira/browse/FLINK-12122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16812308#comment-16812308
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Tony Xintong Song edited comment on FLINK-12122 at 4/8/19 10:46 AM:
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Hi [~till.rohrmann], I agree with you that we should spread tasks evenly across
TaskManagers.
FYI, similar behavior change is already included in the to-be-merged [blink
branch|https://github.com/apache/flink/blob/blink/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/DynamicAssigningSlotManager.java],
where we support three policies (random, spreading based on available slots,
and spreading based on available resource) for distribute slots to TaskManagers
for session mode. [link title|http://example.com]
was (Author: xintongsong):
Hi [~till.rohrmann], I agree with you that we should spread tasks evenly across
TaskManagers.
FYI, similar behavior change is already included in the to-be-merged [blink
branch|[https://github.com/apache/flink/blob/blink/flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/DynamicAssigningSlotManager.java]],
where we support three policies (random, spreading based on available slots,
and spreading based on available resource) for distribute slots to TaskManagers
for session mode.
> Spread out tasks evenly across all available registered TaskManagers
> --------------------------------------------------------------------
>
> Key: FLINK-12122
> URL: https://issues.apache.org/jira/browse/FLINK-12122
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Coordination
> Affects Versions: 1.6.4, 1.7.2, 1.8.0
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
> Priority: Major
> Fix For: 1.7.3, 1.9.0, 1.8.1
>
>
> With Flip-6, we changed the default behaviour how slots are assigned to
> {{TaskManages}}. Instead of evenly spreading it out over all registered
> {{TaskManagers}}, we randomly pick slots from {{TaskManagers}} with a
> tendency to first fill up a TM before using another one. This is a regression
> wrt the pre Flip-6 code.
> I suggest to change the behaviour so that we try to evenly distribute slots
> across all available {{TaskManagers}} by considering how many of their slots
> are already allocated.
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