[CASSANDRA-11587] Cfstats estimate number of keys should return 0 for empty table

• Type: Bug
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 2.2.7, 3.0.7, 3.7
• Component/s: Legacy/Tools
• Labels: lhf

Environment

Cassandra 2.1.13
Nodeltool

• Severity: Low
• Assignee: Mahdi Mohammadinasab
• Reporter: Jane Deng

Authors

Mahdi Mohammadinasab

Reviewers

Yuki Morishita

• Created: 16/Apr/16 00:20
• Updated: 16/Apr/19 09:30
• Resolved: 31/May/16 22:08

Description

If sstable count is 0, the "estimate number of keys" in cfstats shows -1.

SSTable count: 0
Number of keys (estimate): -1

The initial value of keyCount in SSTableReader is -1. When there is no sstable, nor entry in memtable, the keyCount isn't increased. Cfstats should have some boundary check and return 0 for this case.