Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3661#discussion_r21592824
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/ContextWaiter.scala ---
@@ -17,30 +17,74 @@
package org.apache.spark.streaming
+import java.util.concurrent.{TimeoutException, TimeUnit}
+import java.util.concurrent.locks.ReentrantLock
+import javax.annotation.concurrent.GuardedBy
+
private[streaming] class ContextWaiter {
+
+ private val lock = new ReentrantLock()
+ private val condition = lock.newCondition()
+
+ @GuardedBy("lock")
--- End diff --
Yes, that's why I brought it up. It's not actually a standard Java
annotation (unless someone tells me it just turned up in 8 or something) but
part of JSR-305. This is a dependency of Spark core at the moment, but none of
the annotations are used. I think we should just not use them instead of using
this lib in 1 place.
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