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https://issues.apache.org/jira/browse/SPARK-42834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17701610#comment-17701610
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Li Ying commented on SPARK-42834:
---------------------------------
[~csingh] Could you please help confirm this?
> Divided by zero occurs in
> PushBasedFetchHelper.createChunkBlockInfosFromMetaResponse
> ------------------------------------------------------------------------------------
>
> Key: SPARK-42834
> URL: https://issues.apache.org/jira/browse/SPARK-42834
> Project: Spark
> Issue Type: Bug
> Components: Shuffle
> Affects Versions: 3.2.0
> Reporter: Li Ying
> Priority: Major
>
> {color:#222222}Sometimes when run a SQL job with push based shuffle,
> exception occurs as below. It seems that there’s no element in the bitmaps
> which stores merge chunk meta. {color}
> {color:#222222}Is it a bug that we should not createChunkBlockInfos when
> bitmaps is empty or the bitmaps should never be empty here ?{color}
>
> {code:java}
> Caused by: java.lang.ArithmeticException: / by zero
> at
> org.apache.spark.storage.PushBasedFetchHelper.createChunkBlockInfosFromMetaResponse(PushBasedFetchHelper.scala:117)
> at
> org.apache.spark.storage.ShuffleBlockFetcherIterator.next(ShuffleBlockFetcherIterator.scala:980)
> at
> org.apache.spark.storage.ShuffleBlockFetcherIterator.next(ShuffleBlockFetcherIterator.scala:84)
> {code}
> related code:
> {code:java}
> def createChunkBlockInfosFromMetaResponse(
> shuffleId: Int,
> shuffleMergeId: Int,
> reduceId: Int,
> blockSize: Long,
> bitmaps: Array[RoaringBitmap]): ArrayBuffer[(BlockId, Long, Int)] = {
> val approxChunkSize = blockSize / bitmaps.length
> val blocksToFetch = new ArrayBuffer[(BlockId, Long, Int)]()
> for (i <- bitmaps.indices) {
> val blockChunkId = ShuffleBlockChunkId(shuffleId, shuffleMergeId,
> reduceId, i)
> chunksMetaMap.put(blockChunkId, bitmaps(i))
> logDebug(s"adding block chunk $blockChunkId of size $approxChunkSize")
> blocksToFetch += ((blockChunkId, approxChunkSize, SHUFFLE_PUSH_MAP_ID))
> }
> blocksToFetch
> } {code}
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