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https://issues.apache.org/jira/browse/CASSANDRA-12937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17710953#comment-17710953
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Stefan Miklosovic commented on CASSANDRA-12937:
-----------------------------------------------
[~claude] I think it we are half-way there.
This in Config.java
{code}
public SSTableCompressionOptions sstable_compressor;
{code}
should be like this
{code}
public ParameterizedClass sstable_compressor;
{code}
to achieve this:
{code}
sstable_compression:
- class_name: org.apache.cassandra.io.compress.LZ4Compressor
parameters:
- param1: "value1"
{code}
and
{code}
sstable_compression:
- class_name: my.custom.compressor.Implementation
parameters:
- param2: "value2"
{code}
Right now, we need to treat custom implementations like a special case. A user
has to make a difference between "custom compressor" and "compressor bundled in
Cassandra". Why do we need such differentiation? We should treat all
compressors equal when it comes to their configuration. I do not see why we
would do that otherwise.
I am looking forward to the next iteration of the code!
> 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
> 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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