Github user ericl commented on a diff in the pull request: https://github.com/apache/spark/pull/13152#discussion_r72685380 --- Diff: core/src/main/scala/org/apache/spark/storage/BlockManager.scala --- @@ -159,8 +162,27 @@ private[spark] class BlockManager( blockTransferService.init(this) shuffleClient.init(appId) + val topologyInfo = { + val topologyStr = master.getTopologyInfo(blockTransferService.hostName) + if (topologyStr == null || topologyStr.isEmpty) { + None + } else { + Some(topologyStr) + } + } + + blockReplicationPrioritizer = { + val priorityClass = conf.get( + "spark.replication.topologyawareness.prioritizer", + "org.apache.spark.storage.DefaultBlockReplicationPrioritization") + val clazz = Utils.classForName(priorityClass) + val ret = clazz.newInstance.asInstanceOf[BlockReplicationPrioritization] + logInfo(s"Using $priorityClass for prioritizing peers") + ret + } + blockManagerId = BlockManagerId( - executorId, blockTransferService.hostName, blockTransferService.port) + executorId, blockTransferService.hostName, blockTransferService.port, topologyInfo) --- End diff -- Would it work if topologyInfo was sent back from the master when `registerBlockManager` is called? It doesn't seem that anything uses `blockManagerId` until registration finishes. That way we wouldn't need this weird two-step registration.
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