Venki Korukanti created SPARK-35799:
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Summary: Fix the allUpdatesTimeMs metric measuring in
FlatMapGroupsWithStateExec
Key: SPARK-35799
URL: https://issues.apache.org/jira/browse/SPARK-35799
Project: Spark
Issue Type: Improvement
Components: Structured Streaming
Affects Versions: 3.1.2
Reporter: Venki Korukanti
Metric `allUpdatesTimeMs` meant to capture the start to end walltime of the
operator `FlatMapGroupsWithStateExec`, but currently it just
[captures|https://github.com/apache/spark/blob/79362c4efcb6bd4b575438330a14a6191cca5e4b/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/FlatMapGroupsWithStateExec.scala#L121]
the iterator creation time.
Fix it to measure similar to how other stateful operators measure. Example one
[here|https://github.com/apache/spark/blob/79362c4efcb6bd4b575438330a14a6191cca5e4b/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/statefulOperators.scala#L406].
This measurement is not perfect due to the nature of the lazy iterator and
also includes the time the consumer operator spent in processing the current
operator output, but it should give a good signal when comparing the metric in
one microbatch to the metric in another microbatch.
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