Ngone51 commented on a change in pull request #32287: URL: https://github.com/apache/spark/pull/32287#discussion_r622722674
########## File path: core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala ########## @@ -261,14 +282,36 @@ final class ShuffleBlockFetcherIterator( results.put(new SuccessFetchResult(BlockId(blockId), infoMap(blockId)._2, address, infoMap(blockId)._1, buf, remainingBlocks.isEmpty)) logDebug("remainingBlocks: " + remainingBlocks) + enqueueDeferredFetchRequestIfNecessary() } } logTrace(s"Got remote block $blockId after ${Utils.getUsedTimeNs(startTimeNs)}") } override def onBlockFetchFailure(blockId: String, e: Throwable): Unit = { logError(s"Failed to get block(s) from ${req.address.host}:${req.address.port}", e) - results.put(new FailureFetchResult(BlockId(blockId), infoMap(blockId)._2, address, e)) + remainingBlocks -= blockId + val (size, mapIndex) = infoMap(blockId) + e match { + // Catching OOM and do something based on it is only a workaround for handling the + // Netty OOM issue, which is not the best way towards memory management. We can + // get rid of it when we find a way to manage Netty's memory precisely. + + // Ensure the Netty memory is at least enough for serving only one block to avoid + // the endless retry. And since the Netty memory is shared among shuffle, rpc, etc, + // modules, we use "1.5" for the overhead concern. + case _: OutOfDirectMemoryError if PlatformDependent.maxDirectMemory() > ( 1.5 * size) => + if (isNettyOOMOnShuffle.compareAndSet(false, true)) { + // The fetcher can fail remaining blocks in batch for the same error. So we only + // log the warning once to avoid flooding the logs. + logWarning(s"Netty OOM happens, will retry the failed blocks") + } + deferredBlocks += blockId Review comment: That's interesting! But if you look at `RetryingBlockFetchListener`, it also has protection against thread-safe. I'll take another look too. -- 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. 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