LantaoJin opened a new pull request #24157: [WIP][SPARK-27216][CORE] Kryo serialization with RoaringBitmap URL: https://github.com/apache/spark/pull/24157 ## What changes were proposed in this pull request? HighlyCompressedMapStatus uses RoaringBitmap to record the empty blocks. But RoaringBitmap couldn't be ser/deser with unsafe KryoSerializer. ## How was this patch tested? Adding UT ```scala test("kryo serialization with RoaringBitmap") { val bitmap = new RoaringBitmap bitmap.add(1787) val safeSer = new KryoSerializer(conf).newInstance() val bitmap2 : RoaringBitmap = safeSer.deserialize(safeSer.serialize(bitmap)) assert(bitmap2.equals(bitmap)) conf.set("spark.kryo.unsafe", "true") val unsafeSer = new KryoSerializer(conf).newInstance() val bitmap3 : RoaringBitmap = unsafeSer.deserialize(unsafeSer.serialize(bitmap)) assert(bitmap3.equals(bitmap)) // this will fail } ```
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