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From "Radovan Zvoncek (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4165) Generate Digest file for compressed SSTables
Date Mon, 23 Dec 2013 13:25:53 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13855628#comment-13855628
] 

Radovan Zvoncek commented on CASSANDRA-4165:
--------------------------------------------

So I used Marcuse's patch as a basis and added checks preventing computation/writing of CRC
components for compressed files. 

I'm still worried a bit about backwards compatibility though. I did some experiments and didn't
encounter any problems. However, I can't fully comprehend the impact of this change and might
have missed something.

> Generate Digest file for compressed SSTables
> --------------------------------------------
>
>                 Key: CASSANDRA-4165
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4165
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Marcus Eriksson
>            Priority: Minor
>              Labels: performance
>             Fix For: 2.1
>
>         Attachments: 0001-Generate-digest-for-compressed-files-as-well.patch, 0002-dont-do-crc-and-add-digests-for-compressed-files.txt,
4165-rebased.txt
>
>
> We use the generated *Digest.sha1-files to verify backups, would be nice if they were
generated for compressed sstables as well.



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