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Add sync_strategy comments

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martinsumner 2017-02-27 17:32:38 +00:00
parent 2db28c3028
commit fce7cbd2ef
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src/leveled_bookie.erl
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@ -114,6 +114,13 @@
%% low memory installations), there should not be huge variance in outcomes %% low memory installations), there should not be huge variance in outcomes
%% from modifying these numbers. %% from modifying these numbers.
%% %%
%% The sync_strategy determines if the store is going to flush writes to disk
%% before returning an ack. There are three settings currrently supported:
%% - sync - sync to disk by passing the sync flag to the file writer (only
%% works in OTP 18)
%% - riak_sync - sync to disk by explicitly calling data_sync after the write
%% - none - leave it to the operating system to control flushing
%%
%% On startup the Bookie must restart both the Inker to load the Journal, and %% On startup the Bookie must restart both the Inker to load the Journal, and
%% the Penciller to load the Ledger. Once the Penciller has started, the %% the Penciller to load the Ledger. Once the Penciller has started, the
%% Bookie should request the highest sequence number in the Ledger, and then %% Bookie should request the highest sequence number in the Ledger, and then