[jira] [Assigned] (SPARK-11271) MapStatus too large for driver

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-11271?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-11271:
------------------------------------

    Assignee: Apache Spark

> 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: Apache Spark
>
> 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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