[jira] [Updated] (CASSANDRA-17357) Snapshot true size computation does not include secondary indexes

["Paulo Motta (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-17357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paulo Motta updated CASSANDRA-17357:
------------------------------------
     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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