f5ba2fc1b9
* Amend defaults 3.0.9 testing has used different defaults for cache_size and penciller_cache_size. There has been no noticeable drop in the performance of Riak using these defaults, so adopting here. The new defaults have a lower memory requirement per vnode, which is useful as recent changes and performance test results are changing the standard recommendations for ring_size. It is now preferred to choose larger ring_sizes by default (e.g. 256 for 6 - 12 nodes, 512 for 12 - 20 nodes, 1024 for 20 +). By choosing larger ring sizes, the benefits of scaling up a cluster will continue to make a difference even as the node count goes beyond the recommended "correct" setting. e.g. It might be reasonable (depending on hardware choices) to grow a ring_size=512 cluster to beyond 30 nodes, yet still be relatively efficient and performant at 8 nodes. * Comment correction
185 lines
6.6 KiB
Erlang
185 lines
6.6 KiB
Erlang
%% -*- erlang -*-
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%%%% leveled
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%% @doc A path under which leveled data files will be stored.
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{mapping, "leveled.data_root", "leveled.data_root", [
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{default, "$(platform_data_dir)/leveled"},
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{datatype, directory}
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]}.
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%% @doc Strategy for flushing data to disk
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%% Can be set to riak_sync, sync (if OTP > 16) or none. Use none, and the OS
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%% will flush when most efficient. Use riak_sync or sync to flush after every
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%% PUT (not recommended without some hardware support e.g. flash drives and/or
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%% Flash-backed Write Caches)
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{mapping, "leveled.sync_strategy", "leveled.sync_strategy", [
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{default, none},
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{datatype, atom}
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]}.
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%% @doc The key size of the Bookie's in-memory cache
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{mapping, "leveled.cache_size", "leveled.cache_size", [
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{default, 2000},
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{datatype, integer},
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hidden
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]}.
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%% @doc The key size of the Penciller's in-memory cache
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{mapping, "leveled.penciller_cache_size", "leveled.penciller_cache_size", [
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{default, 20000},
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{datatype, integer},
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hidden
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]}.
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%% @doc Compression method
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%% Can be lz4 or native (which will use the Erlang native zlib compression)
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%% within term_to_binary
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{mapping, "leveled.compression_method", "leveled.compression_method", [
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{default, native},
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{datatype, atom}
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]}.
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%% @doc Compression point
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%% The point at which compression is applied to the Journal (the Ledger is
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%% always compressed). Use on_receipt or on_compact. on_compact is suitable
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%% when values are unlikely to yield much benefit from compression
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%% (compression is only attempted when compacting)
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{mapping, "leveled.compression_point", "leveled.compression_point", [
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{default, on_receipt},
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{datatype, atom}
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]}.
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%% @doc Log level
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%% Can be debug, info, warn, error or critical
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%% Set the minimum log level to be used within leveled. Leveled will log many
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%% lines to allow for stats to be etracted by those using log indexers such as
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%% Splunk
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{mapping, "leveled.log_level", "leveled.log_level", [
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{default, info},
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{datatype, atom}
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]}.
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%% @doc The approximate size (in bytes) when a Journal file should be rolled.
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%% Normally keep this as around the size of o(100K) objects. Default is 1GB.
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%% Note that on startup an actual maximum size will be chosen which varies by
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%% a random factor from this point - to avoid coordination of roll events
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%% across vnodes.
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{mapping, "leveled.journal_size", "leveled.journal_size", [
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{default, 1000000000},
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{datatype, integer}
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]}.
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%% @doc The approximate count of objects when a Journal file should be rolled.
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%% This time measured in object count, a file will be rolled if either the
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%% object count or the journal size limit is reached. Default 200K.
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%% Note that on startup an actual maximum size will be chosen which varies by
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%% a random factor from this point - to avoid coordination of roll events
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%% across vnodes.
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{mapping, "leveled.journal_objectcount", "leveled.journal_objectcount", [
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{default, 200000},
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{datatype, integer}
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]}.
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%% @doc The level of the ledger to be pre-loaded into the page cache
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%% Depending on how much memory is available for the page cache, and how much
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%% disk I/O activity can be tolerated at startup - then the level at which the
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%% ledger is forced into the page cache can be controlled by configuration.
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{mapping, "leveled.ledger_pagecachelevel", "leveled.ledger_pagecachelevel", [
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{default, 4},
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{datatype, integer}
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]}.
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%% @doc The number of journal compactions per vnode per day
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%% The higher the value, the more compaction runs, and the sooner space is
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%% recovered. But each run has a cost
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{mapping, "leveled.compaction_runs_perday", "leveled.compaction_runs_perday", [
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{default, 24},
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{datatype, integer}
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]}.
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%% @doc The number of times per day to score an individual file for compaction.
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%% The default value will lead to each file, on average, being scored once
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%% every 12 hours
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{mapping, "leveled.compaction_scores_perday", "leveled.compaction_scores_perday", [
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{default, 2},
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{datatype, integer}
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]}.
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%% @doc Compaction Low Hour
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%% The hour of the day in which journal compaction can start. Use Low hour
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%% of 0 and High hour of 23 to have no compaction window (i.e. always compact
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%% regardless of time of day)
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{mapping, "leveled.compaction_low_hour", "leveled.compaction_low_hour", [
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{default, 0},
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{datatype, integer}
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]}.
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%% @doc Compaction Top Hour
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%% The hour of the day, after which journal compaction should stop.
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%% If low hour > top hour then, compaction will work overnight between low
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%% hour and top hour (inclusive). Timings rely on server's view of local time
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{mapping, "leveled.compaction_top_hour", "leveled.compaction_top_hour", [
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{default, 23},
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{datatype, integer}
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]}.
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%% @doc Max Journal Files Per Compaction Run
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%% In a single compaction run, what is the maximum number of consecutive files
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%% which may be compacted. If increasing this value, the average number of
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%% files per run may decrease, unless adjustments are also made to the
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%% maxrunlength and singlefile compactionpercentage settings.
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{mapping, "leveled.max_run_length", "leveled.max_run_length", [
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{default, 4},
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{datatype, integer}
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]}.
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%% @doc Target Percentage for Max Run
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%% What is the target score for a maximum run of files, to qualify for
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%% compaction. If less than this percentage would be retained after compaction
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%% then it is a candidate (e.g. in default case if 25% of space would be
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%% recovered)
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{mapping, "leveled.maxrunlength_compactionpercentage", "leveled.maxrunlength_compactionpercentage", [
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{default, 75.0},
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{datatype, float},
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hidden
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]}.
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%% @doc Target Percentage for Single File
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%% What is the target score for a run of a single file, to qualify for
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%% compaction. If less than this percentage would be retained after compaction
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%% then it is a candidate (e.g. in default case if 75% of space would be
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%% recovered)
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{mapping, "leveled.singlefile_compactionpercentage", "leveled.singlefile_compactionpercentage", [
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{default, 25.0},
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{datatype, float},
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hidden
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]}.
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%% @doc Snapshot timeout (short)
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%% Maximum expected time for an index query. A query which is taking longer
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%% than this may fail as it will be released - potentially allowing for some
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%% file processes to delete. Timeout is in seconds.
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{mapping, "leveled.snapshot_timeout_short", "leveled.snapshot_timeout_short", [
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{default, 1800},
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{datatype, integer},
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hidden
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]}.
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%% @doc Snapshot timeout (long)
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%% Maximum expected time for any other fold. A fold which is taking longer
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%% than this may fail as it will be released - potentially allowing for some
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%% file processes to delete. Timeout is in seconds.
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{mapping, "leveled.snapshot_timeout_long", "leveled.snapshot_timeout_long", [
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{default, 86400},
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{datatype, integer},
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hidden
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]}.
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