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https://issues.apache.org/jira/browse/CASSANDRA-18111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17856762#comment-17856762
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Francisco Guerrero commented on CASSANDRA-18111:
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I was just discussing with Yifan about how to maintain backwards compatibility
for this file. What I would propose is something that looks like this instead:
{ "files" : ["oa-1-big-Data.db", "oa-2-big-Data.db", "oa-3-big-Data.db"],
"file_sizes" : [123, 123, 123, 123],
"file_checksums" : ["1234", "1234", "1234", "1234"],
"created_at" : "2024-06-18T10:49:22.789Z", "expires_at" : null,
"ephemeral" : false}
This way we simplify the reading logic on newer versions where we would need to
support reading both the old and new format.
> 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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