venkata91 commented on a change in pull request #30164:
URL: https://github.com/apache/spark/pull/30164#discussion_r524805840
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File path:
core/src/main/scala/org/apache/spark/storage/BlockManagerMasterEndpoint.scala
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@@ -657,6 +688,43 @@ class BlockManagerMasterEndpoint(
}
}
+ private def getShufflePushMergerLocations(
+ numMergersNeeded: Int,
+ hostsToFilter: Set[String]): Seq[BlockManagerId] = {
+ val blockManagersWithExecutors =
blockManagerIdByExecutor.groupBy(_._2.host)
+ .mapValues(_.head).values.map(_._2).toSet
+ val filteredBlockManagersWithExecutors = blockManagersWithExecutors
+ .filterNot(x => hostsToFilter.contains(x.host))
+ val filteredMergersWithExecutors = filteredBlockManagersWithExecutors.map(
+ x => BlockManagerId(x.executorId, x.host,
StorageUtils.externalShuffleServicePort(conf)))
+
+ // Enough mergers are available as part of active executors list
+ if (filteredMergersWithExecutors.size >= numMergersNeeded) {
+ filteredMergersWithExecutors.toSeq
+ } else {
+ // Delta mergers added from inactive mergers list to the active mergers
list
+ val filteredMergersWithExecutorsHosts =
filteredMergersWithExecutors.map(_.host)
+ val filteredMergersWithoutExecutors = shuffleMergerLocations.values
+ .filterNot(x => hostsToFilter.contains(x.host))
+ .filterNot(x => filteredMergersWithExecutorsHosts.contains(x.host))
+ val randomFilteredMergersLocations =
+ if (filteredMergersWithoutExecutors.size >
+ numMergersNeeded - filteredMergersWithExecutors.size) {
+ Utils.randomize(filteredMergersWithoutExecutors)
+ } else {
+ filteredMergersWithoutExecutors
+ }
+ filteredMergersWithExecutors.toSeq ++ randomFilteredMergersLocations
+ .take(numMergersNeeded - filteredMergersWithExecutors.size)
Review comment:
I checked the `Iterable` size and its not scanning through the
collection. It seems to work fine. Also we have a test case which is covering
this case. Let me know if I'm missing something here. Thanks
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