Details
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Improvement
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Status: Patch Available
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Normal
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Resolution: Unresolved
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None
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Performance
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Normal
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All
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None
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Description
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.
Attachments
Issue Links
- is related to
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CASSANDRA-17588 "Total TrueDiskSpaceUsed" computation does not include manifest and schema files
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- Open
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CASSANDRA-13338 JMX: EstimatedPartitionCount / SnapshotSize are expensive
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- Open
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CASSANDRA-18102 Add a virtual table to list snapshots
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- Resolved
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CASSANDRASC-94 Reduce filesystem calls while streaming SSTables
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- Resolved
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CASSANDRA-19512 Add startup flag to load a local snapshot from disk
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- Triage Needed
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- relates to
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CASSANDRA-18271 Centralize all snapshot operations to SnapshotManager
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- Resolved
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- links to