[jira] [Assigned] (CASSANDRA-12937) Default setting (yaml) for SSTable compression

["Kanthi Subramanian (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-12937?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Kanthi Subramanian reassigned CASSANDRA-12937:
----------------------------------------------

    Assignee:     (was: Kanthi Subramanian)

> Default setting (yaml) for SSTable compression
> ----------------------------------------------
>
>                 Key: CASSANDRA-12937
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12937
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local/Config
>            Reporter: Michael Semb Wever
>            Priority: Low
>              Labels: AdventCalendar2021, lhf
>
> In many situations the choice of compression for sstables is more relevant to the disks attached than to the schema and data.
> This issue is to add to cassandra.yaml a default value for sstable compression that new tables will inherit (instead of the defaults found in {{CompressionParams.DEFAULT}}.
> Examples where this can be relevant are filesystems that do on-the-fly compression (btrfs, zfs) or specific disk configurations or even specific C* versions (see CASSANDRA-10995 ).
> +Additional information for newcomers+
> Some new fields need to be added to {{cassandra.yaml}} to allow specifying the field required for defining the default compression parameters. In {{DatabaseDescriptor}} a new {{CompressionParams}} field should be added for the default compression. This field should be initialized in {{DatabaseDescriptor.applySimpleConfig()}}. At the different places where {{CompressionParams.DEFAULT}} was used the code should call {{DatabaseDescriptor#getDefaultCompressionParams}} that should return some copy of configured {{CompressionParams}}.
> Some unit test using {{OverrideConfigurationLoader}} should be used to test that the table schema use the new default when a new table is created (see CreateTest for some example).



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