Charles Lewis created SPARK-20087:
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Summary: Include accumulators / taskMetrics when sending
TaskKilled to onTaskEnd listeners
Key: SPARK-20087
URL: https://issues.apache.org/jira/browse/SPARK-20087
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.1.0
Reporter: Charles Lewis
When tasks end due to an ExceptionFailure, subscribers to onTaskEnd receive
accumulators / task metrics for that task, if they were still available. These
metrics are not currently sent when tasks are killed intentionally, such as
when a speculative retry finishes, and the original is killed (or vice versa).
Since we're killing these tasks ourselves, these metrics should almost always
exist, and we should treat them the same way as we treat ExceptionFailures.
Sending these metrics with the TaskKilled end reason makes aggregation across
all tasks in an app more accurate. This data can inform decisions about how to
tune the speculation parameters in order to minimize duplicated work, and in
general, the total cost of an app should include both successful and failed
tasks, if that information exists.
PR: https://github.com/apache/spark/pull/17422
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