pan3793 commented on code in PR #1876:
URL:
https://github.com/apache/incubator-celeborn/pull/1876#discussion_r1314856891
##########
client-spark/spark-3/src/main/scala/org/apache/spark/shuffle/celeborn/CelebornShuffleReader.scala:
##########
@@ -62,15 +70,51 @@ class CelebornShuffleReader[K, C](
metrics.incFetchWaitTime(time)
}
+ if (streamCreatorPool == null) {
+ CelebornShuffleReader.synchronized {
+ if (streamCreatorPool == null) {
+ streamCreatorPool = ThreadUtils.newDaemonCachedThreadPool(
+ "create-stream-thread",
+ conf.readStreamCreatorPoolThreads,
+ 60);
+ }
+ }
+ }
+
+ val streams = new ConcurrentHashMap[Integer, CelebornInputStream]()
+ (startPartition until endPartition).map(partitionId => {
+ streamCreatorPool.submit(new Runnable {
+ override def run(): Unit = {
+ if (exceptionRef.get() == null) {
+ try {
+ val inputStream = shuffleClient.readPartition(
+ handle.shuffleId,
+ partitionId,
+ context.attemptNumber(),
+ startMapIndex,
+ endMapIndex)
+ streams.put(partitionId, inputStream)
+ } catch {
+ case e: IOException =>
+ logInfo("Exception caught when readPartition!")
+ exceptionRef.compareAndSet(null, e)
+ }
+ }
+ }
+ })
+ })
+
val recordIter = (startPartition until
endPartition).iterator.map(partitionId => {
if (handle.numMappers > 0) {
val start = System.currentTimeMillis()
- val inputStream = shuffleClient.readPartition(
- handle.shuffleId,
- partitionId,
- context.attemptNumber(),
- startMapIndex,
- endMapIndex)
+ var inputStream: CelebornInputStream = streams.get(partitionId)
+ while (inputStream == null) {
+ if (exceptionRef.get() != null) {
Review Comment:
It's not guaranteed that this method won't throw other unchecked exceptions.
The `javac` only checks checked exceptions must be listed in the method
signature, for Scala compiler, no checks.
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