leveled

Martin Sumner c2f19d8825 Switch to using bloom at penciller Previouslythe tinybloom was used within the SST file as an extra check to remove false fetches. However the SST already has a low FPR check in the slot_index. If the newebloom was used (which is no longer per slot, but per sst), this can be shared with the penciller and then the penciller could use it and avoid the message pass. the message pass may be blocked by a 2i query or a slot fetch request for a merge. So this should make performance within the Penciller snappier. This is as a result of taking sst_timings within a volume test - where there was an average of + 100microsecs for each level that was dropped down. Given the bloom/slot checks were < 20 microsecs - there seems to be some further delay. The bloom is a binary of > 64 bytes - so passing it around should not require a copy.	2017-11-28 01:19:30 +00:00
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leveled.hrl	Switch to using bloom at penciller	2017-11-28 01:19:30 +00:00

Martin Sumner c2f19d8825 Switch to using bloom at penciller

Previouslythe tinybloom was used within the SST file as an extra check to remove false fetches.

However the SST already has a low FPR check in the slot_index.  If the newebloom was used (which is no longer per slot, but per sst), this can be shared with the penciller and then the penciller could use it and avoid the message pass.

the message pass may be blocked by a 2i query or a slot fetch request for a merge.  So this should make performance within the Penciller snappier.

This is as a result of taking sst_timings within a volume test - where there was an average of + 100microsecs for each level that was dropped down.  Given the bloom/slot checks were < 20 microsecs - there seems to be some further delay.

The bloom is a binary of > 64 bytes - so passing it around should not require a copy.

2017-11-28 01:19:30 +00:00

leveled.hrl

Switch to using bloom at penciller

2017-11-28 01:19:30 +00:00