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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4165) Generate Digest file for compressed SSTables
Date Mon, 23 Sep 2013 15:30:14 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4165?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13774636#comment-13774636
] 

Jonathan Ellis commented on CASSANDRA-4165:
-------------------------------------------

So we have

# Block-level CRC, in a CRC component, for uncompressed files
# File-level hash, in a Digest component, for uncompressed files
# Block-level CRC, inline in the Data component, for compressed files
# [proposed] file-level hash, in a Digest component, for compressed files

So at the least we should clean up the patch here to not also generate a CRC component for
compressed files.  Not sure what else we can do to clean it up ... I'm not sure I'm a fan
of the CRC component to begin with, but removing it (in favor of a CRCOnlyCompression, for
instance) is out of scope here.
                
> 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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