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https://issues.apache.org/jira/browse/SPARK-11271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Davies Liu reopened SPARK-11271:
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https://github.com/apache/spark/pull/9243 is reverted
> MapStatus too large for driver
> ------------------------------
>
> Key: SPARK-11271
> URL: https://issues.apache.org/jira/browse/SPARK-11271
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle
> Reporter: Kent Yao
> Assignee: Liang-Chi Hsieh
> Fix For: 1.6.0
>
>
> When I run a spark job contains quite a lot of tasks(in my case is
> 200k[maptasks]*200k[reducetasks]), the driver occured OOM mainly caused by
> the object MapStatus,
> RoaringBitmap that used to mark which block is empty seems to use too many
> memories.
> I try to use org.apache.spark.util.collection.BitSet instead of
> RoaringBitMap, and it can save about 20% memories.
> For the 200K tasks job,
> RoaringBitMap uses 3 Long[1024] and 1 Short[3392]
> =3*64*1024+16*3392=250880(bit)
> BitSet uses 1 Long[3125] = 3125*64=200000(bit)
> Memory saved = (250880-200000) / 250880 ≈20%
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