Paulo Motta created CASSANDRA-17357:
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Summary: Snapshot true size computation does not include secondary
indexes
Key: CASSANDRA-17357
URL: https://issues.apache.org/jira/browse/CASSANDRA-17357
Project: Cassandra
Issue Type: Bug
Components: Local/Snapshots
Reporter: Paulo Motta
Assignee: Paulo Motta
The true size is supposed to show the total size of the snapshot minus any live
sstables.
Nevertheless, sstables from secondary indexes are not included in the
computation of the true size, causing a mismatch between the true size and
snapshot size when there are indexes and no live sstables.
It's possible to fetch the global snapshot size per table and indexes
separately via nodetool tablestats, but not for individual snapshots.
This behavior seems to be there since before 3.0, so I think it has always been
like this.
Reproduction steps:
{noformat}
% ccm node1 nodetool -- snapshot -t test test_ks
Requested creating snapshot(s) for [test_ks] with snapshot name [test]
Snapshot directory: test
% ccm node1 nodetool listsnapshots
Snapshot Details:
Snapshot name Keyspace name Column family name True size Size on disk
test test_ks tbl 0 bytes 10.76 KB
Total TrueDiskSpaceUsed: 0 bytes
% ccm node1 nodetool tablestats test_ks.tbl | grep -i snapshot
Space used by snapshots (total): 0
% ccm node1 nodetool tablestats test_ks.tbl.tbl_val_idx | grep -i snapshot
Space used by snapshots (total): 0
% ccm node1 nodetool compact test_ks tbl.tbl_val_idx
% ccm node1 nodetool compact test_ks tbl_val_idx
% ccm node1 nodetool tablestats test_ks.tbl | grep -i snapshot
Space used by snapshots (total): 5027
% ccm node1 nodetool tablestats test_ks.tbl.tbl_val_idx | grep -i snapshot
Space used by snapshots (total): 5060
% ccm node1 nodetool listsnapshots
Snapshot Details:
Snapshot name Keyspace name Column family name True size Size on disk
test test_ks tbl 4.91 KB 10.76 KB
Total TrueDiskSpaceUsed: 4.91 KB
{noformat}
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