Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18162#discussion_r119533807
--- Diff: core/src/main/scala/org/apache/spark/executor/TaskMetrics.scala
---
@@ -112,6 +112,12 @@ class TaskMetrics private[spark] () extends
Serializable {
/**
* Storage statuses of any blocks that have been updated as a result of
this task.
+ *
+ * Tracking the _updatedBlockStatuses can use a lot of memory.
+ * It is not used anywhere inside of Spark so we would ideally remove
it, but its exposed to
+ * the user in SparkListenerTaskEnd so the api is kept for compatibility.
+ * By default it is configured to not actually save the block statuses
via config
+ * TASK_METRICS_TRACK_UPDATED_BLOCK_STATUSES.
*/
def updatedBlockStatuses: Seq[(BlockId, BlockStatus)] = {
--- End diff --
Shall we deprecate it? Considering the cost of collecting this information,
I think we should not encourage users to use it...
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