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Posted to commits@cassandra.apache.org by "Vijay (JIRA)" <ji...@apache.org> on 2013/09/21 00:34:58 UTC

[jira] [Commented] (CASSANDRA-4165) Generate Digest file for compressed SSTables

    [ https://issues.apache.org/jira/browse/CASSANDRA-4165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13773543#comment-13773543 ] 

Vijay commented on CASSANDRA-4165:
----------------------------------

Hi Jonathan, 3648 actually adds block level CRC for uncompressed files and writes to a separate file (CRC.db), and uses it during the streaming parts of the file to validate before streaming (not during normal reads). Hence we need 2 Checksums during the flush 1 for blocks and the md5 for the whole file.
                
> Generate Digest file for compressed SSTables
> --------------------------------------------
>
>                 Key: CASSANDRA-4165
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4165
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Marcus Eriksson
>            Assignee: Marcus Eriksson
>            Priority: Minor
>         Attachments: 0001-Generate-digest-for-compressed-files-as-well.patch, 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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