123 lines
4.1 KiB
Erlang
123 lines
4.1 KiB
Erlang
%% -*- erlang -*-
|
|
|
|
%%%% leveled
|
|
|
|
%% @doc A path under which leveled data files will be stored.
|
|
{mapping, "multi_backend.$name.leveled.data_root", "riak_kv.multi_backend", [
|
|
{default, "$(platform_data_dir)/leveled"},
|
|
{datatype, directory}
|
|
]}.
|
|
|
|
%% @doc Strategy for flushing data to disk
|
|
%% Can be set to riak_sync, sync (if OTP > 16) or none. Use none, and the OS
|
|
%% will flush when most efficient. Use riak_sync or sync to flush after every
|
|
%% PUT (not recommended wihtout some hardware support e.g. flash drives and/or
|
|
%% Flash-backed Write Caches)
|
|
{mapping, "multi_backend.$name.leveled.sync_strategy", "riak_kv.multi_backend", [
|
|
{default, none},
|
|
{datatype, atom}
|
|
]}.
|
|
|
|
|
|
%% @doc The key size of the Bookie's in-memory cache
|
|
{mapping, "multi_backend.$name.leveled.cache_size", "riak_kv.multi_backend", [
|
|
{default, 4000},
|
|
{datatype, integer},
|
|
hidden
|
|
]}.
|
|
|
|
%% @doc The key size of the Penciller's in-memory cache
|
|
{mapping, "multi_backend.$name.leveled.penciller_cache_size", "riak_kv.multi_backend", [
|
|
{default, 28000},
|
|
{datatype, integer},
|
|
hidden
|
|
]}.
|
|
|
|
%% @doc Compression method
|
|
%% Can be lz4 or native (which will use the Erlang native zlib compression)
|
|
%% within term_to_binary
|
|
{mapping, "multi_backend.$name.leveled.compression_method", "riak_kv.multi_backend", [
|
|
{default, lz4},
|
|
{datatype, atom}
|
|
]}.
|
|
|
|
%% @doc Compression point
|
|
%% The point at which compression is applied to the Journal (the Ledger is
|
|
%% always compressed). Use on_receipt or on_compact. on_compact is suitable
|
|
%% when values are unlikely to yield much benefit from compression
|
|
%% (compression is only attempted when compacting)
|
|
{mapping, "multi_backend.$name.leveled.compression_point", "riak_kv.multi_backend", [
|
|
{default, on_receipt},
|
|
{datatype, atom}
|
|
]}.
|
|
|
|
|
|
%% @doc The approximate size (in bytes) when a Journal file should be rolled.
|
|
%% Normally keep this as around the size of o(100K) objects. Default is 500MB
|
|
{mapping, "multi_backend.$name.leveled.journal_size", "riak_kv.multi_backend", [
|
|
{default, 500000000},
|
|
{datatype, integer}
|
|
]}.
|
|
|
|
%% @doc The number of journal compactions per vnode per day
|
|
%% The higher the value, the more compaction runs, and the sooner space is
|
|
%% recovered. But each run has a cost
|
|
{mapping, "multi_backend.$name.leveled.compaction_runs_perday", "riak_kv.multi_backend", [
|
|
{default, 16},
|
|
{datatype, integer}
|
|
]}.
|
|
|
|
%% @doc Compaction Low Hour
|
|
%% The hour of the day in which journal compaction can start. Use Low hour
|
|
%% of 0 and High hour of 23 to have no compaction window (i.e. always compact
|
|
%% regardless of time of day)
|
|
{mapping, "multi_backend.$name.leveled.compaction_low_hour", "riak_kv.multi_backend", [
|
|
{default, 0},
|
|
{datatype, integer}
|
|
]}.
|
|
|
|
%% @doc Compaction Top Hour
|
|
%% The hour of the day, after which journal compaction should stop.
|
|
%% If low hour > top hour then, compaction will work overnight between low
|
|
%% hour and top hour (inclusive). Timings rely on server's view of local time
|
|
{mapping, "multi_backend.$name.leveled.compaction_top_hour", "riak_kv.multi_backend", [
|
|
{default, 23},
|
|
{datatype, integer}
|
|
]}.
|
|
|
|
%% @doc Max Journal Files Per Compaction Run
|
|
%% In a single compaction run, what is the maximum number of consecutive files
|
|
%% which may be compacted.
|
|
{mapping, "multi_backend.$name.leveled.max_run_length", "riak_kv.multi_backend", [
|
|
{default, 6},
|
|
{datatype, integer}
|
|
]}.
|
|
|
|
%% @doc Target Percentage for Max Run
|
|
%% What is the target score for a maximum run of files, to qualify for
|
|
%% compaction. If less than this percentage would be retained after compaction
|
|
%% then it is a candidate (e.g. in default case if 25% of space would be
|
|
%% recovered)
|
|
{mapping, "multi_backend.$name.leveled.maxrunlength_compactionpercentage", "riak_kv.multi_backend", [
|
|
{default, 75.0},
|
|
{datatype, float},
|
|
hidden
|
|
]}.
|
|
|
|
%% @doc Target Percentage for Single File
|
|
%% What is the target score for a run of a single file, to qualify for
|
|
%% compaction. If less than this percentage would be retained after compaction
|
|
%% then it is a candidate (e.g. in default case if 50% of space would be
|
|
%% recovered)
|
|
{mapping, "multi_backend.$name.leveled.singlefile_compactionpercentage", "riak_kv.multi_backend", [
|
|
{default, 50.0},
|
|
{datatype, float},
|
|
hidden
|
|
]}.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|