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https://issues.apache.org/jira/browse/CASSANDRA-18111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17854744#comment-17854744
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Stefan Miklosovic commented on CASSANDRA-18111:
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Current state as of writing this comment looking into CASSANDRA-18111 patch of
[~paulo] in his repository.
a) is done
b) is done
c) is done
d) not done yet
for d) I think that we need to start a thread which would periodically scan the
snapshots and when it detects that some snapshot on disk is missing then it
would remove it in the manager too.
> 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
> Priority: Normal
>
> 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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