finish snapshot support
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Key: CASSANDRA-279
URL: https://issues.apache.org/jira/browse/CASSANDRA-279
Project: Cassandra
Issue Type: New Feature
Reporter: Jonathan Ellis
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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