Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/2143#discussion_r16756688
--- Diff: core/src/main/scala/org/apache/spark/ContextCleaner.scala ---
@@ -76,6 +76,20 @@ private[spark] class ContextCleaner(sc: SparkContext)
extends Logging {
private val blockOnCleanupTasks = sc.conf.getBoolean(
"spark.cleaner.referenceTracking.blocking", true)
+ /**
+ * Whether the cleaning thread will block on shuffle cleanup tasks.
+ * This overrides the global setting `blockOnCleanupTasks`
+ *
+ * When context cleaner is configured to block on every delete request,
it can throw timeout
+ * exceptions on cleanup of shuffle blocks, as reported in SPARK-3139.
To avoid that, this
+ * parameter by default disables blocking on shuffle cleanups. Note that
this does not affect
+ * the cleanup of RDDs and broadcasts. This is intended to be a
temporary workaround,
+ * until the real Akka issue (referred to in the comment above
`blockOnCleanupTasks`) is
+ * resolved.
+ */
+ private val blockOnShuffleCleanupTasks = sc.conf.getBoolean(
+ "spark.cleaner.referenceTracking.blocking.shuffle", false)
--- End diff --
I'm fine with the changes as is. This is not a huge deal since we don't
expose it.
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