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From Piotr Kołaczkowski (JIRA) <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4049) Add generic way of adding SSTable components required custom compaction strategy
Date Wed, 20 Jun 2012 11:46:43 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13397436#comment-13397436
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Piotr Kołaczkowski commented on CASSANDRA-4049:
-----------------------------------------------

Hmm, I'm also not sure how to do that, but giving them custom names is important. What if
we want to provide two compaction strategies using custom components instead of one? What
if user wants to switch from one strategy to another one? We'd have to be very careful that
they don't use the same custom component for storing different things. So it would be also
quite fragile. 


                
> Add generic way of adding SSTable components required custom compaction strategy
> --------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4049
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4049
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Piotr Kołaczkowski
>            Assignee: Piotr Kołaczkowski
>            Priority: Minor
>              Labels: compaction
>             Fix For: 1.1.2
>
>         Attachments: compaction_strategy_cleanup.patch, component_patch.diff
>
>
> CFS compaction strategy coming up in the next DSE release needs to store some important
information in Tombstones.db and RemovedKeys.db files, one per sstable. However, currently
Cassandra issues warnings when these files are found in the data directory. Additionally,
when switched to SizeTieredCompactionStrategy, the files are left in the data directory after
compaction.
> The attached patch adds new components to the Component class so Cassandra knows about
those files.

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