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| author | Alistair Coles <alistairncoles@gmail.com> | 2021-03-05 15:59:22 +0000 |
|---|---|---|
| committer | Alistair Coles <alistairncoles@gmail.com> | 2021-05-20 21:00:02 +0100 |
| commit | 18f20daf389e3db42c7bfb56a520913e416caaf7 (patch) | |
| tree | 55333c51792e650bcd0fa53e0e9b3f32e542d2be /doc | |
| parent | f7fd99a880fee87ef3e5515206aa7f217ae5c0af (diff) | |
| download | swift-18f20daf389e3db42c7bfb56a520913e416caaf7.tar.gz | |
Add absolute values for shard shrinking config options
Add two new sharder config options for configuring shrinking
behaviour:
- shrink_threshold: the size below which a shard may shrink
- expansion_limit: the maximum size to which an acceptor shard
may grow
The new options match the 'swift-manage-shard-ranges' command line
options and take absolute values.
The new options provide alternatives to the current equivalent options
'shard_shrink_point' and 'shard_shrink_merge_point', which are
expressed as percentages of 'shard_container_threshold'.
'shard_shrink_point' and 'shard_shrink_merge_point' are deprecated and
will be overridden by the new options if the new options are
explicitly set in a config file.
The default values of the new options are the same as the values that
would result from the default 'shard_container_threshold',
'shard_shrink_point' and 'shard_shrink_merge_point' i.e.:
- shrink_threshold: 100000
- expansion_limit: 750000
Change-Id: I087eac961c1eab53540fe56be4881e01ded1f60e
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/source/config/container_server_config.rst | 43 |
1 files changed, 37 insertions, 6 deletions
diff --git a/doc/source/config/container_server_config.rst b/doc/source/config/container_server_config.rst index 85fb9b377..8b64214fb 100644 --- a/doc/source/config/container_server_config.rst +++ b/doc/source/config/container_server_config.rst @@ -287,6 +287,8 @@ the following configuration options defined for the `[container-replicator]`_: * rsync_module * recon_cache_path +Some config options in this section may also be used by the +:ref:`swift-manage-shard-ranges CLI tool <swift-manage-shard-ranges>`. ================================= ================= ======================================= Option Default Description @@ -310,8 +312,7 @@ auto_shard false If the auto_shard option this option to true in a production cluster. -shard_container_threshold 1000000 When auto-sharding is - enabled this defines the +shard_container_threshold 1000000 This defines the object count at which a container with container-sharding @@ -326,8 +327,24 @@ shard_container_threshold 1000000 When auto-sharding is shrinking and merging shard containers. -shard_shrink_point 10 When auto-sharding is - enabled this defines the +shrink_threshold This defines the + object count below which + a 'donor' shard container + will be considered for + shrinking into another + 'acceptor' shard + container. The default is + determined by + shard_shrink_point. If + set, shrink_threshold + will take precedence over + shard_shrink_point. + +shard_shrink_point 10 Deprecated: shrink_threshold + is recommended and if set + will take precedence over + shard_shrink_point. + This defines the object count below which a 'donor' shard container will be considered for @@ -341,8 +358,22 @@ shard_shrink_point 10 When auto-sharding is 10 means 10% of the shard_container_threshold. -shard_shrink_merge_point 75 When auto-sharding is - enabled this defines the +expansion_limit This defines the + maximum allowed size of + an acceptor shard + container after having a + donor merged into it. The + default is determined by + shard_shrink_merge_point. + If set, expansion_limit + will take precedence over + shard_shrink_merge_point. + +shard_shrink_merge_point 75 Deprecated: expansion_limit + is recommended and if set + will take precedence over + shard_shrink_merge_point. + This defines the maximum allowed size of an acceptor shard container after having a |