cloud-fan 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_r319474398
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File path: core/src/main/scala/org/apache/spark/storage/BlockManager.scala
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@@ -206,6 +206,8 @@ private[spark] class BlockManager(
new BlockManager.RemoteBlockDownloadFileManager(this)
private val maxRemoteBlockToMem =
conf.get(config.MAX_REMOTE_BLOCK_SIZE_FETCH_TO_MEM)
+ private val executorIdToLocalDirsCache = new mutable.HashMap[String,
Array[String]]()
Review comment:
when do we update it? e.g. what if an executor is down.
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