[jira] [Created] (CASSANDRA-18111) Cache snapshots in memory

["Paulo Motta (Jira)" <ji...@apache.org>]

Paulo Motta created CASSANDRA-18111:
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             Summary: Cache snapshots in memory
                 Key: CASSANDRA-18111
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-18111
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Paulo Motta
            Assignee: Paulo Motta


Everytime {{nodetool listsnapshots}} is called, all data directories are scanned to find snapshots, what is inefficient.

For example, fetching the {{org.apache.cassandra.metrics:type=ColumnFamily,name=SnapshotsSize}} metric can take half a second (CASSANDRA-13338).

This improvement will also allow snapshots to be efficiently queried via virtual tables (CASSANDRA-18102).

In order to do this, we should:
a) load all snapshots from disk during initialization
b) keep a collection of snapshots on {{SnapshotManager}}
c) update the snapshots collection anytime a new snapshot is taken or cleared
d) detect when a snapshot is manually removed from disk.



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