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https://issues.apache.org/jira/browse/FLINK-14063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16974878#comment-16974878
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Kurt Young commented on FLINK-14063:
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Sure
> Operators use fractions to decide how many managed memory to allocate
> ---------------------------------------------------------------------
>
> Key: FLINK-14063
> URL: https://issues.apache.org/jira/browse/FLINK-14063
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Task
> Reporter: Xintong Song
> Priority: Major
>
> * Operators allocate memory segments with the amount returned by
> {{MemoryManager#computeNumberOfPages}}.
> * Operators reserve memory with the amount returned by
> {{MemoryManager#computeMemorySize}}.
> This step activates the new fraction based managed memory.
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