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https://issues.apache.org/jira/browse/CASSANDRA-12937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17719800#comment-17719800
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Claude Warren commented on CASSANDRA-12937:
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I did not modify the code path for the commit_log_compression (or any other
compression other than sstable_compression) . CommitLog does not create a
CompressionParams object from the configuration it just constructs an
ICompression instance. That path is not affected by the changes in the pull
request. We can add that later but it was not included in this change.
There was a path where unrecognised variables were not detected. That has been
corrected and tests added.
There was an issue with chunk_length_in_kb not being serialized to the map
correctly in some cases. That has been corrected and tests added.
The commented out configuration in the yaml file is not functional if
uncommented.
Additional comments were added to explain the items that were previously
explained by the broken configuration. (e.g. max_compressed_length needing to
have the GiB, MiB, KiB suffix)
Additional comment was added to specify that all parameter values must be
strings.
> 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
> Assignee: Claude Warren
> Priority: Low
> Labels: AdventCalendar2021, lhf
> Fix For: 5.x
>
> Time Spent: 3h 20m
> Remaining Estimate: 0h
>
> 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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