Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22371#discussion_r216166979
--- Diff:
core/src/main/scala/org/apache/spark/shuffle/IndexShuffleBlockResolver.scala ---
@@ -51,6 +52,8 @@ private[spark] class IndexShuffleBlockResolver(
private val transportConf = SparkTransportConf.fromSparkConf(conf,
"shuffle")
+ private val shuffleIdToLocks = new ConcurrentHashMap[Int,
Array[Object]]()
--- End diff --
How about `Array[_]` if the type is truly irrelevant? But I get that it's
always going to be an Object given the usage here.
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