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## What changes were proposed in this pull request? An additional trigger and trigger executor that will execute a single trigger only. One can use this OneTime trigger to have more control over the scheduling of triggers. In addition, this patch requires an optimization to StreamExecution that logs a commit record at the end of successfully processing a batch. This new commit log will be used to determine the next batch (offsets) to process after a restart, instead of using the offset log itself to determine what batch to process next after restart; using the offset log to determine this would process the previously logged batch, always, thus not permitting a OneTime trigger feature. ## How was this patch tested? A number of existing tests have been revised. These tests all assumed that when restarting a stream, the last batch in the offset log is to be re-processed. Given that we now have a commit log that will tell us if that last batch was processed successfully, the results/assumptions of those tests needed to be revised accordingly. In addition, a OneTime trigger test was added to StreamingQuerySuite, which tests: - The semantics of OneTime trigger (i.e., on start, execute a single batch, then stop). - The case when the commit log was not able to successfully log the completion of a batch before restart, which would mean that we should fall back to what's in the offset log. - A OneTime trigger execution that results in an exception being thrown. marmbrus tdas zsxwing Please review http://spark.apache.org/contributing.html before opening a pull request. Author: Tyson Condie <tcondie@gmail.com> Author: Tathagata Das <tathagata.das1565@gmail.com> Closes #17219 from tcondie/stream-commit. |
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.. | ||
ml | ||
mllib | ||
sql | ||
streaming | ||
__init__.py | ||
accumulators.py | ||
broadcast.py | ||
cloudpickle.py | ||
conf.py | ||
context.py | ||
daemon.py | ||
files.py | ||
find_spark_home.py | ||
heapq3.py | ||
java_gateway.py | ||
join.py | ||
profiler.py | ||
rdd.py | ||
rddsampler.py | ||
resultiterable.py | ||
serializers.py | ||
shell.py | ||
shuffle.py | ||
statcounter.py | ||
status.py | ||
storagelevel.py | ||
taskcontext.py | ||
tests.py | ||
traceback_utils.py | ||
version.py | ||
worker.py |