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From "Sylvain Lebresne (Updated) (JIRA)" <>
Subject [jira] [Updated] (CASSANDRA-3406) Create a nodetool upgrade_sstables to avoid using scrubs for tasks it wasn't intended to.
Date Wed, 16 Nov 2011 18:52:54 GMT


Sylvain Lebresne updated CASSANDRA-3406:

    Attachment: 0002-Add-upgradesstables-command.patch

Patches attached with the refactor in its own patch.
> Create a nodetool upgrade_sstables to avoid using scrubs for tasks it wasn't intended
> -----------------------------------------------------------------------------------------
>                 Key: CASSANDRA-3406
>                 URL:
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>    Affects Versions: 1.0.0
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Trivial
>             Fix For: 1.0.4
>         Attachments: 0001-Refactor-to-avoid-code-duplication.patch, 0002-Add-upgradesstables-command.patch
> Scrub was intended to check a data file is not corrupted and to try to correct some form
of corruption and discard the data when it can't repair. But we are now using it also for:
> * major upgrade, to have sstable in the new data format for streaming sake (that one
could be "fixed" independently by supporting old format during streaming)
> * to force the compaction of existing sstables after changing the compression algorithm
> We should probably provide a separate tool/command for those two last tasks since:
> * we could have a better name, like upgrade_sstables or rewrite_sstables for that operation
> * we could avoid the automatic snapshot that scrub does (and is not expected by users
for those operations)
> * make it slightly quicker/simpler by avoiding the corruption detection code

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