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https://issues.apache.org/jira/browse/CASSANDRA-17357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paulo Motta updated CASSANDRA-17357:
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Bug Category: Parent values: Correctness(12982)Level 1 values: API /
Semantic Definition(13162)
Complexity: Normal
Discovered By: Code Inspection
Fix Version/s: 4.1
Severity: Low
Status: Open (was: Triage Needed)
> 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
> Priority: Normal
> Fix For: 4.1
>
>
> 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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