Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/16272#discussion_r92279247 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/ProgressReporter.scala --- @@ -71,7 +71,7 @@ trait ProgressReporter extends Logging { private var metricWarningLogged: Boolean = false /** Holds the most recent query progress updates. Accesses must lock on the queue itself. */ - private val progressBuffer = new mutable.Queue[StreamingQueryProgress]() + @transient private val progressBuffer = new mutable.Queue[StreamingQueryProgress]() --- End diff -- mark `progressBuffer` `@transient` instead of changing it to serializable because it may contain a lot of progresses and we should try to avoid sending them to executors.
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