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https://issues.apache.org/jira/browse/SPARK-27216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16804447#comment-16804447
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Andrew Allen commented on SPARK-27216:
--------------------------------------
Thanks for this bug report, [~cltlfcjin]. We we running into
"FetchFailedException: Received a zero-size buffer for block shuffle_0_0_332
from BlockManagerId" and this bug report gave us enough of the hint to try
{{config.set("spark.kryo.unsafe", "false")}} which worked-around the issue.
> Kryo serialization with RoaringBitmap
> -------------------------------------
>
> Key: SPARK-27216
> URL: https://issues.apache.org/jira/browse/SPARK-27216
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.3.3, 2.4.0, 3.0.0
> Reporter: Lantao Jin
> Priority: Major
>
> HighlyCompressedMapStatus uses RoaringBitmap to record the empty blocks. But
> RoaringBitmap couldn't be ser/deser with unsafe KryoSerializer.
> We can use below UT to reproduce:
> {code}
> 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
> }
> {code}
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