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https://issues.apache.org/jira/browse/CASSANDRA-20942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stefan Miklosovic updated CASSANDRA-20942:
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Change Category: Operability
Complexity: Normal
Component/s: Feature/Compression
Fix Version/s: 6.x
Status: Open (was: Triage Needed)
> Enhance nodetool compressiondictionary train command with scope options
> -----------------------------------------------------------------------
>
> Key: CASSANDRA-20942
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20942
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Feature/Compression
> Reporter: Yifan Cai
> Assignee: Stefan Miklosovic
> Priority: Normal
> Fix For: 6.x
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Extend the traincompressiondictionary nodetool command to include global /
> local dictionary scope
> * Global (default): Store in system_distributed.compression_dictionaries and
> make available cluster-wide.
> * Local: Restrict dictionary availability to the current node, when
> dictionary from local data is desired.
> This should be safe in general as dictionaries are baked into an SSTable and
> "travel" (e.g. by means of streaming) around cluster. The fact another node
> does not have a dictionary of another to compress is okay, if it ever gets an
> SSTable from another node, it will be able to work with it anyway.
> This option might be choosen for the evaluation of a dictionary compression
> ratio before rolling it out cluster-wide. That would be done by e.g.
> "exporting" and "importing" via nodetool which will save it to
> system_distributed ...
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