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https://issues.apache.org/jira/browse/CASSANDRA-17021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18030182#comment-18030182
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Jon Haddad edited comment on CASSANDRA-17021 at 10/15/25 9:49 PM:
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I noticed that if you try to train a dictionary for a table but aren't using
zstd dict compression, it still tries to start, then errors out like this:
{noformat}
bin/nodetool traincompressiondictionary cassandra_easy_stress keyvalue
Starting compression dictionary training for cassandra_easy_stress.keyvalue...
Training from existing SSTables (flushing first if needed)
Failed to trigger training: null{noformat}
Can you add a check before it starts that makes sure the user is using a
compression strategy that supports training?
was (Author: rustyrazorblade):
I noticed that if you try to train a dictionary for a table but aren't using
zstd dict compression, it still tries to start, then errors out like this:
{noformat}
bin/nodetool traincompressiondictionary cassandra_easy_stress keyvalue
Starting compression dictionary training for cassandra_easy_stress.keyvalue...
Training from existing SSTables (flushing first if needed)
Failed to trigger training: null{noformat}
Can you add a check that makes sure the user is using a compression strategy
that supports training?
> Enhance Zstd support in Cassandra with dictionaries
> ---------------------------------------------------
>
> Key: CASSANDRA-17021
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17021
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Feature/Compression
> Reporter: Dinesh Joshi
> Assignee: Yifan Cai
> Priority: Normal
> Time Spent: 17h 20m
> Remaining Estimate: 0h
>
> Currently Cassandra supports zstd compression. However, Zstd also supports
> dictionaries to enhance not only the compression ratio but also the speed.
> Dictionaries can show 3-4x savings. We should add support to train
> dictionaries, ideally per SSTable this will yield the maximum gains.
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