add cache save/load
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Key: CASSANDRA-1417
URL: https://issues.apache.org/jira/browse/CASSANDRA-1417
Project: Cassandra
Issue Type: New Feature
Components: Core
Reporter: Jonathan Ellis
Fix For: 0.6.6, 0.7 beta 2
Since mixing 0.7 nodes with 0.6 is looking increasingly unlikely to be
supported because of the deep changes to Thrift, we should allow saving out the
0.6 cache and loading it on startup so that we don't inflict the pain of an
entire cluster of cold cache on upgraders.
The cache format should just be a list of row keys. Loading it is as simple as
calling getColumnFamily (with a zero-column predicate) on each row, for row
cache.
Key cache is more complicated, but only a little. First is that you have to
de-duplicate the row keys from multiple sstables. (Saving which sstable
version it's associated with is less useful, since that will be obsoleted by
compaction.) Second is that we don't need to actually read any row data, we
just need to go through the index locator part of the read path (getPosition).
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