holdenk commented on a change in pull request #28370:
URL: https://github.com/apache/spark/pull/28370#discussion_r444452013
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File path: core/src/main/scala/org/apache/spark/storage/BlockManager.scala
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@@ -1551,30 +1555,36 @@ private[spark] class BlockManager(
}
/**
- * Called for pro-active replenishment of blocks lost due to executor
failures
+ * Replicates a block to peer block managers based on existingReplicas and
maxReplicas
*
* @param blockId blockId being replicate
* @param existingReplicas existing block managers that have a replica
* @param maxReplicas maximum replicas needed
+ * @param maxReplicationFailures number of replication failures to tolerate
before
+ * giving up.
+ * @return whether block was successfully replicated or not
*/
def replicateBlock(
Review comment:
So the existing block replication is for the case where blocks we stored
on two machines and due to executor loss are now down to one machine so they
are replicated. It's not useless but it doesn't solve the same core problem.
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