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https://issues.apache.org/jira/browse/CASSANDRA-21034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18039412#comment-18039412
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Stefan Miklosovic commented on CASSANDRA-21034:
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This is actually not a bug. I forgot there is "flush_compression" in
cassandra.yaml which drives this. When I used "table" value for that config
then it was indeed compressed with Zstd dictionary when flushed.
> ZstdDictionaryCompressor is not used upon flush
> -----------------------------------------------
>
> Key: CASSANDRA-21034
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21034
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Feature/Compression
> Reporter: Stefan Miklosovic
> Priority: Normal
>
> When I insert data to a table and do {{nodetool flush}}, an SSTable is
> created, but it will be compacted with LZ4 (seen via sstablemetadata).
> Correct compressor should be used upon flush as well so flushed data are
> compressed by a Zstd dictionary too.
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