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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-2284) Make changes to the set of memtables and sstables of a cfstore atomic
Date Tue, 08 Mar 2011 21:08:59 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13004213#comment-13004213
] 

Stu Hood commented on CASSANDRA-2284:
-------------------------------------

This looks really really good. My only complaint is that getRangeSlice and getColumnFamily
moved into DataTracker: I'd prefer that View be exposed from DataTracker so that those methods
could stay where they were. In particular, the fact that DataTracker needs a reference to
CFStore seems like a bad sign.

> 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.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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