Lukasz Gajowy created BEAM-6969:
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Summary: Provide way to collect start/end read/write time inside
the IOs
Key: BEAM-6969
URL: https://issues.apache.org/jira/browse/BEAM-6969
Project: Beam
Issue Type: Wish
Components: io-ideas, testing
Reporter: Lukasz Gajowy
Currently, IO tests measure time using Metrics API but collect start/end time
from ParDo transforms that are adjacent to the IO. It's fine for some tests but
maybe could be done better. The drawback of the current solution is that we
cannot collect time before PBegin and after PDone. Other than that the time we
collect now is still not the exact time of read/write start/end but only the
time at which first/last record appeared in the DoFn.
See:
[TimeMonitor.java|https://github.com/apache/beam/blob/957b7cc7746aa626d2eb4dea341f668ec19d5d39/sdks/java/testing/test-utils/src/main/java/org/apache/beam/sdk/testutils/metrics/TimeMonitor.java]
as an example of such DoFn.
Possible solution: save metrics in startBundle / finishBundle method in IOs
whenever a dedicated pipelineOption is set to true.
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