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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2284) Make changes to the set of memtables and sstables of a cfstore atomic
Date Mon, 21 Mar 2011 17:45:06 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009234#comment-13009234
] 

Jonathan Ellis commented on CASSANDRA-2284:
-------------------------------------------

I agree with Stu -- I like v2 better.  I agree w/ the general sentiment that CFS is too bloated,
but queries into DT means now DT is trying to do too many things too.

Could we move the caches into DT?  That feels like a better fit than query logic, and would
make it possible to avoid the CFS reference (instead we would just need the CFMetadata object).

> Make changes to the set of memtables and sstables of a cfstore atomic 
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-2284
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2284
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>             Fix For: 0.8
>
>         Attachments: 0001-Make-memtable-and-sstable-switches-atomic-v2.patch, 0001-Make-memtable-and-sstable-switches-atomic.patch
>
>   Original Estimate: 8h
>  Remaining Estimate: 8h
>
> Some switches happen in the set of memtables and sstables of a cfstore:
>   * when we switch the memtable, the current memtable is replaced by a new one and add
to the memtablesPendingFlush
>   * when a memtable is fully flushed, it is removed from memtablesPendingFlush and the
newly created sstable is added to the set of active sstables.
>   * after compaction, compacted memtables are removed from the active sstables and the
compacted sstable is added instead
> Only the last of these operations is atomic. This ticket proposes to makes all of them
atomic, using the idea of the View idea hinted by Stu in the comments of CASSANDRA-1954.
> The main reason for this is to fix CASSANDRA-2105. But I think that another benefit of
this is to make reasoning about those operations easier.

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