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https://issues.apache.org/jira/browse/CASSANDRA-2284?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sylvain Lebresne updated CASSANDRA-2284:
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Attachment: 0001-Make-memtable-and-sstable-switches-atomic.patch
Attached patch against trunk and after CASSANDRA-2272. This could be rebased
without #2272 but I'd rather not have to unless there is strong opposition to
it.
The patch moves a bunch of functions from ColumnFamilyStore to (the new)
DataTracker. Arguably this is not absolutely necessray for a handful of them,
but the rational was to cut some fat out of ColumnFamilyStore when that made
sense (2.2K loc in current trunk, 1.8K (still) after this).
> 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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