[jira] [Commented] (CASSANDRA-10775) SSTable compression ratio is not serialized properly

["Benjamin Lerer (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-10775?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15028493#comment-15028493 ] 

Benjamin Lerer commented on CASSANDRA-10775:
--------------------------------------------

The problem comes from the fact that in {{BigTableWriter.TransactionalProxy.doPrepare()}} the Metadata were computed before the {{CompressedSequentialWriter}} could add the compression ratio to the {{MetadataCollector}}.

> SSTable compression ratio is not serialized properly
> ----------------------------------------------------
>
>                 Key: CASSANDRA-10775
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10775
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local Write-Read Paths
>            Reporter: Benjamin Lerer
>            Assignee: Benjamin Lerer
>             Fix For: 3.0.x, 3.x
>
>
> While reviewing CASSANDRA-10225, I found out that the compression ratio returned by the {{StatsMetadata}} for some compressed sstables was - 1 (NO_COMPRESSION_RATIO). 
> After investigation it seems that the wrong compression ratio was serialized to disk. 



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