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Amend defaults (#367)

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* 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
This commit is contained in:
Martin Sumner 2021-11-01 19:29:28 +00:00
parent 27cf6bef55
commit f5ba2fc1b9
2 changed files with 10 additions and 10 deletions
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10
priv/leveled_multi.schema
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@ -23,14 +23,14 @@
%% @doc The key size of the Bookie's in-memory cache
{mapping, "multi_backend.$name.leveled.cache_size", "riak_kv.multi_backend", [
{default, 4000},
{default, 2000},
{datatype, integer},
hidden
]}.
%% @doc The key size of the Penciller's in-memory cache
{mapping, "multi_backend.$name.leveled.penciller_cache_size", "riak_kv.multi_backend", [
{default, 28000},
{default, 20000},
{datatype, integer},
hidden
]}.
@ -98,9 +98,9 @@
%% @doc The number of times per day to score an individual file for compaction
%% The default value will lead to each file, on average, being scored once
%% every 8 hours
%% every 12 hours
{mapping, "multi_backend.$name.leveled.compaction_scores_perday", "riak_kv.multi_backend", [
{default, 3},
{default, 2},
{datatype, integer}
]}.
@ -169,7 +169,7 @@
]}.
%% @doc Snapshot timeout (long)
%% Maximum expected time for any othe rfold. A fold which is taking longer
%% Maximum expected time for any other fold. A fold which is taking longer
%% than this may fail as it will be released - potentially allowing for some
%% file processes to delete. Timeout is in seconds.
{mapping, "multi_backend.$name.leveled.snapshot_timeout_long", "riak_kv.multi_backend", [