GitHub user cxzl25 opened a pull request:
https://github.com/apache/spark/pull/21656
[SPARK-24677][Core]MedianHeap is empty when speculation is enabled, causing
the SparkContext to stop
## What changes were proposed in this pull request?
When speculation is enabled,
TaskSetManager#markPartitionCompleted should write successful task duration
to MedianHeap,
not just increase tasksSuccessful.
Otherwise when TaskSetManager#checkSpeculatableTasks,tasksSuccessful
non-zero, but MedianHeap is empty.
Then throw an exception successfulTaskDurations.median
java.util.NoSuchElementException: MedianHeap is empty.
Finally led to stopping SparkContext.
## How was this patch tested?
manual tests
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cxzl25/spark fix_MedianHeap_empty
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21656.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #21656
----
commit 467f0bccb7d1940bed4f1b2e633c9374b0e654f2
Author: sychen <sychen@...>
Date: 2018-06-28T07:34:38Z
MedianHeap is empty when speculation is enabled, causing the SparkContext
to stop.
----
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
