vanzin commented on a change in pull request #25299: [SPARK-27651][Core] Avoid
the network when shuffle blocks are fetched from the same host
URL: https://github.com/apache/spark/pull/25299#discussion_r308944004
##########
File path:
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala
##########
@@ -365,12 +387,43 @@ final class ShuffleBlockFetcherIterator(
}
}
+
+ /**
+ * Fetch the host-local blocks while we are fetching remote blocks. This is
ok because
+ * `ManagedBuffer`'s memory is allocated lazily when we create the input
stream, so all we
+ * track in-memory are the ManagedBuffer references themselves.
+ */
+ private[this] def fetchHostLocalBlocks() {
+ logDebug(s"Start fetching host-local blocks: ${hostLocalBlocks.mkString(",
")}")
+
+ val localDirsByExec =
+
blockManager.master.getHostLocalDirs(hostLocalBlocksByExecutor.keySet.toArray).localDirs
+ for ((localDirs, blocks) <-
localDirsByExec.zip(hostLocalBlocksByExecutor.values);
+ blockId <- blocks) {
Review comment:
indent more
I actually prefer this for multi-line fors:
```
for (
a <- b;
c <-d;
...
) {
...
}
```
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