Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/126#discussion_r11369285
--- Diff:
core/src/main/scala/org/apache/spark/storage/BlockManagerMaster.scala ---
@@ -125,6 +156,51 @@ class BlockManagerMaster(var driverActor: ActorRef,
conf: SparkConf) extends Log
askDriverWithReply[Array[StorageStatus]](GetStorageStatus)
}
+ /**
+ * Return the block's status on all block managers, if any. NOTE: This
is a
+ * potentially expensive operation and should only be used for testing.
+ *
+ * If askSlaves is true, this invokes the master to query each block
manager for the most
+ * updated block statuses. This is useful when the master is not
informed of the given block
+ * by all block managers.
+ */
+ def getBlockStatus(
+ blockId: BlockId,
+ askSlaves: Boolean = true): Map[BlockManagerId, BlockStatus] = {
+ val msg = GetBlockStatus(blockId, askSlaves)
+ /*
+ * To avoid potential deadlocks, the use of Futures is necessary,
because the master actor
+ * should not block on waiting for a block manager, which can in turn
be waiting for the
+ * master actor for a response to a prior message.
+ */
+ val response = askDriverWithReply[Map[BlockManagerId,
Future[Option[BlockStatus]]]](msg)
+ val (blockManagerIds, futures) = response.unzip
+ val result = Await.result(Future.sequence(futures), timeout)
+ if (result == null) {
+ throw new SparkException("BlockManager returned null for BlockStatus
query: " + blockId)
+ }
+ val blockStatus = result.asInstanceOf[Iterable[Option[BlockStatus]]]
+ blockManagerIds.zip(blockStatus).flatMap { case (blockManagerId,
status) =>
+ status.map { s => (blockManagerId, s) }
+ }.toMap
+ }
+
+ /**
+ * Return a list of ids of existing blocks such that the ids match the
given filter. NOTE: This
+ * is a potentially expensive operation and should only be used for
testing.
+ *
+ * If askSlaves is true, this invokes the master to query each block
manager for the most
+ * updated block statuses. This is useful when the master is not
informed of the given block
+ * by all block managers.
+ */
+ def getMatchinghBlockIds(
--- End diff --
Wait, this is still a typo...
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