Roman Puchkovskiy created IGNITE-16878:
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Summary: Use exponential moving average to estimate checkpoint
write speed
Key: IGNITE-16878
URL: https://issues.apache.org/jira/browse/IGNITE-16878
Project: Ignite
Issue Type: Improvement
Components: persistence
Reporter: Roman Puchkovskiy
The speed-based throttling (implemented in
SpeedBasedMemoryConsumptionThrottlingStrategy) uses an estimation of checkpoint
write speed (in pages per second) to decide whether to throttle (and how hard)
or not.
Currently, this estimation is obtained by taking a moving average for the
current checkpoint and up to 3 preceeding checkpoints. This should work well if
the checkpoint writing speed is stable. But if this speed changes a lot
(probably, due to some other disk activity, like rotating the WAL or activity
of other applications), this change only becomes noticed after a substantial
amount of time.
The idea is to use exponential moving average
https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average to make
the metric note the changes faster. Other weightings can also be considered.
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