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Date: Mon, 28 Mar 2011 14:46:06 +0000 (UTC)
From: "Sylvain Lebresne (JIRA)" <jira@apache.org>
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Subject: [jira] [Resolved] (CASSANDRA-2284) Make changes to the set of
 memtables and sstables of a cfstore atomic
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     [ https://issues.apache.org/jira/browse/CASSANDRA-2284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sylvain Lebresne resolved CASSANDRA-2284.
-----------------------------------------

    Resolution: Fixed

> 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: Improvement
>          Components: Core
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>             Fix For: 0.8
>
>         Attachments: 0001-Make-memtable-and-sstable-switches-atomic-v2.patch, 0001-Make-memtable-and-sstable-switches-atomic-v3.patch, 0001-Make-memtable-and-sstable-switches-atomic.patch, 2284-v2-rebased.txt
>
>   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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