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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-2284) Make changes to the set of memtables and sstables of a cfstore atomic
Date Tue, 08 Mar 2011 13:20:59 GMT
Make changes to the set of memtables and sstables of a cfstore atomic 
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                 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

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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