Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/15923#discussion_r94358078
--- Diff:
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
---
@@ -305,40 +316,84 @@ final class ShuffleBlockFetcherIterator(
*/
override def next(): (BlockId, InputStream) = {
numBlocksProcessed += 1
- val startFetchWait = System.currentTimeMillis()
- currentResult = results.take()
- val result = currentResult
- val stopFetchWait = System.currentTimeMillis()
- shuffleMetrics.incFetchWaitTime(stopFetchWait - startFetchWait)
-
- result match {
- case SuccessFetchResult(_, address, size, buf, isNetworkReqDone) =>
- if (address != blockManager.blockManagerId) {
- shuffleMetrics.incRemoteBytesRead(buf.size)
- shuffleMetrics.incRemoteBlocksFetched(1)
- }
- bytesInFlight -= size
- if (isNetworkReqDone) {
- reqsInFlight -= 1
- logDebug("Number of requests in flight " + reqsInFlight)
- }
- case _ =>
- }
- // Send fetch requests up to maxBytesInFlight
- fetchUpToMaxBytes()
- result match {
- case FailureFetchResult(blockId, address, e) =>
- throwFetchFailedException(blockId, address, e)
+ var result: FetchResult = null
+ var input: InputStream = null
+ // Take the next fetched result and try to decompress it to detect
data corruption,
+ // then fetch it one more time if it's corrupt, throw
FailureFetchResult if the second fetch
--- End diff --
@Tagar Spark doesn't use Netty's Snappy compression.
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