Github user kayousterhout commented on a diff in the pull request:
https://github.com/apache/spark/pull/14079#discussion_r86649317
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala ---
@@ -217,18 +219,35 @@ private[yarn] class YarnAllocator(
* @param localityAwareTasks number of locality aware tasks to be used
as container placement hint
* @param hostToLocalTaskCount a map of preferred hostname to possible
task counts to be used as
* container placement hint.
+ * @param nodeBlacklist a set of blacklisted nodes, which is passed in
to avoid allocating new
+ * containers on them. It will be used to update
the application master's
+ * blacklist.
* @return Whether the new requested total is different than the old
value.
*/
def requestTotalExecutorsWithPreferredLocalities(
requestedTotal: Int,
localityAwareTasks: Int,
- hostToLocalTaskCount: Map[String, Int]): Boolean = synchronized {
+ hostToLocalTaskCount: Map[String, Int],
+ nodeBlacklist: Set[String]): Boolean = synchronized {
this.numLocalityAwareTasks = localityAwareTasks
this.hostToLocalTaskCounts = hostToLocalTaskCount
if (requestedTotal != targetNumExecutors) {
logInfo(s"Driver requested a total number of $requestedTotal
executor(s).")
targetNumExecutors = requestedTotal
+
+ // Update blacklist infomation to YARN ResouceManager for this
application,
+ // in order to avoid allocating new Containers on the problematic
nodes.
+ val blacklistAdditions = nodeBlacklist -- currentNodeBlacklist
+ val blacklistRemovals = currentNodeBlacklist -- nodeBlacklist
--- End diff --
would be nice to have a unit test for this that mocked out amClient (to
make sure it gets called with the right deltas)
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