#2529
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Ran 07 Dec 2020 05:55AM UTC

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Files 77

Run time 7s

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Build # #2529

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Committed by

ben-manes

Commit Message

Fix write-time optimization for variable expiration (fixes #478)

A high write rate to the same key can overwhelm the write buffer as it
may not drop entries and has a maximum capacity. When full this causes
backpressure to allow for the mainance task to catch up. A write only
needs to be recorded in this buffer when a major event occurs, such as
the entry's size changed or expiration time differs.

To improve throughput for expireAfterWrite a tolerance of 1s is used
to allow for skipping the write buffer and recording into the read
buffer instead. This improves throughput by 5x in a same key write
benchmark.

This optimization was not updated to take into account variable
expiration, where the expire time may change based on the calculation
determined by configured Expiry. This would cause the entry to not be
reordered in the TimerWheel, possibly delaying the automic removal
indefinitely. Now when the variable time differs by +/- 1s then the
write-time reordering is required.

Co-authored-by: Christopher Ng <facboy@gmail.com>

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Jobs

ID	Job ID	Ran	Files	Coverage
1	#2529.1	07 Dec 2020 05:55AM UTC	0	93.07

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