I'm using standalone bitcask as a backend for our in-memory database
(not opensourced yet). I write ~1.5GB of data to it each 5 minutes
overwriting almost all keys and after that I run a merge as follows:
case bitcask:needs_merge(BitcaskRef) of
{true, Files} ->
bitcask_merge_worker:merge(DataDir, [], Files);
false ->
ok
end.
For now it runs for some days under test load and when I've analyzed
logs I saw something strange. Here
http://img804.imageshack.us/img804/1060/fromlogs.png the upper graph
depicts a durations of merges; as one can see, there at least 2 "saw"
forms with different time scales overlapped. Is there any reason why
it is so? I have a gut feeling that such a variance isn't so good :)
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