姚琴 created SPARK-11271:
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Summary: 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: 姚琴
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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