sjvanrossum opened a new pull request, #34165:
URL: https://github.com/apache/beam/pull/34165
The offset gap ratio may artificially shrink the backlog if consumers can't
catch up to the tail of an expiring topic. This may cause runners to trigger a
downscaling event which worsens the issue.
MovingAvg has been modified to atomically write the accumulated state since
concurrent normal loads/stores of longs/doubles may tear. The numUpdates field
is only used by the writer and can be kept as non-volatile, but the update
method ensures that normal loads/stores on numUpdates are ordered in relation
to acquiring loads and releasing stores on avg. To prevent false sharing I've
padded the class since there may be tens to hundreds of instances of the
accumulator and updates happen per consumed record.
The JMH benchmark I've added shows a slight uplift in average time per op
for both reads and writes compared to the current implementation.
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