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https://issues.apache.org/jira/browse/CASSANDRA-18111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17856620#comment-17856620
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Yifan Cai commented on CASSANDRA-18111:
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{quote}I am not sure why there is only db file included, probably because that
acts as the primary contributor to the snapshot size and all other files are
negligible when it comes to their sizes compared to db file. Neverthless, we
should add all files there. {quote}
Agree with [~smiklosovic] that the manifest should include all files. It should
also include the necessary file attributes for data integrity. In some
scenarios, it is mandatory to have the other components. For example, a
compressed data file requires compressionInfo component. Otherwise it is not
readable.
I think it is preferable to have a large static manifest file that can ensure
snapshot data integrity, instead of a small file missing information.
> Centralize all snapshot operations to SnapshotManager and cache snapshots
> -------------------------------------------------------------------------
>
> Key: CASSANDRA-18111
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18111
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Snapshots
> Reporter: Paulo Motta
> Assignee: Stefan Miklosovic
> Priority: Normal
> Fix For: 5.x
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> 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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