Li Ying created SPARK-42834:
-------------------------------
Summary: 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
{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. See
org.apache.spark.storage.PushBasedFetchHelper.createChunkBlockInfosFromMetaResponse.{color}
{color:#222222} {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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