sadikovi commented on code in PR #45266: URL: https://github.com/apache/spark/pull/45266#discussion_r1508420402
########## core/src/main/scala/org/apache/spark/Dependency.scala: ########## @@ -206,6 +206,21 @@ class ShuffleDependency[K: ClassTag, V: ClassTag, C: ClassTag]( finalizeTask = Option(task) } + // Set the threshold to 1 billion which leads to an 128MB bitmap and + // the actual size of `HighlyCompressedMapStatus` can be much larger than 128MB. + // This may crash the driver with an OOM error. + private val SHUFFLE_BLOCK_NUMBER_WARNING_THRESHOLD: Long = 1L << 30 + private val numberOfShuffleBlocks = numPartitions.toLong * partitioner.numPartitions.toLong + + if (numberOfShuffleBlocks > SHUFFLE_BLOCK_NUMBER_WARNING_THRESHOLD) { + logWarning( + s"The number of shuffle blocks (${numberOfShuffleBlocks}) for shuffleId ${shuffleId} " + + s"for ${_rdd} with ${numPartitions} partitions is possibly too large, " + + "which could cause the driver to crash with an out-of-memory error. " + + "Consider decreasing the number of partitions in this shuffle stage." + ) + } + Review Comment: I would like to suggest not using the companion object for just one constant - we can just inline it in the if condition, we already have a comment explaining the meaning. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org