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https://issues.apache.org/jira/browse/SPARK-3493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Or updated SPARK-3493:
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Issue Type: Bug (was: Improvement)
> Unrolling behavior is too aggressive in dropping blocks
> -------------------------------------------------------
>
> Key: SPARK-3493
> URL: https://issues.apache.org/jira/browse/SPARK-3493
> Project: Spark
> Issue Type: Bug
> Components: Block Manager
> Affects Versions: 1.1.0
> Reporter: Andrew Or
> Assignee: Andrew Or
>
> When unrolling a new block, we (almost) always call `ensureFreeSpace` with a
> fixed fraction (spark.storage.unrollFraction) of the block manager's total
> memory minus a small delta. This means we're essentially reserving this chunk
> of memory in advance because we allocate all of this space even if the new
> block is very small.
> We need to call `ensureFreeSpace` incrementally and more cautiously to avoid
> unnecessarily dropping blocks where possible.
> Thanks to [~tdas] for originally reporting this.
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