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https://issues.apache.org/jira/browse/CASSANDRA-279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733872#action_12733872
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Michael Greene commented on CASSANDRA-279:
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Agreed with jbellis re: directory hierarchy.
In the usage, should say "snapshot [name]" so the parameter is discoverable.
Both commands work correctly over here, on both Ubuntu 9.04 and Win2008.
> finish snapshot support
> -----------------------
>
> Key: CASSANDRA-279
> URL: https://issues.apache.org/jira/browse/CASSANDRA-279
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Sammy Yu
> Attachments: 0001-Work-for-CASSANDRA-279.patch,
> 0001-Work-for-CASSANDRA-279.patch, 0002-Work-for-CASSANDRA-279.patch,
> 0003-Patch-for-Cassandra-279-3rd.patch, 279-3.patch
>
>
> searching for "snapshot" in *.java shows a bunch of code for supporting
> snapshots via hard links.
> (this works b/c SSTables are immutable, once created.)
> this used to be more complete but when we dropped the JDK7 requirement we
> just removed the code that we couldn't do in JDK6 and hard link support was
> one of those.
> So what you would need to do here is:
> * create a hard link method (using Runtime.exec("ln") on linux / os x I
> imagine)
> * add a JMX hook to invoke this on the data files (this is where looking at
> the old codebase might help); ColumnFamilyStoreMBean.forceFlush is an example
> of an "Action" jmx interface. using jconsole to interact with JMX stuff is
> explained here: http://wiki.apache.org/cassandra/MemtableThresholds
> * add something to list the snapshots available via JMX
> * optionally make this all per-Table instead of per-database
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