[CASSANDRA-4860] Estimated Row Cache Entry size incorrect (always 24?)

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 1.2.0 beta 3
• Labels: qa-resolved
• Severity: Normal
• Assignee: Vijay
• Reporter: Chris Burroughs

Authors

Vijay

Reviewers

Jonathan Ellis

• Tester: Ryan McGuire
• Created: 24/Oct/12 22:11
• Updated: 16/Apr/19 09:32
• Resolved: 13/May/13 20:04

Description

After running for several hours the RowCacheSize was suspicious low (ie 70 something MB) I used CASSANDRA-4859 to measure the size and number of entries on a node:

In [3]: 1560504./65021
Out[3]: 24.0

In [4]: 2149464./89561
Out[4]: 24.0

In [6]: 7216096./300785
Out[6]: 23.990877204647838

That's RowCacheSize/RowCacheNumEntires . Just to prove I don't have crazy small rows the mean size of the row keys in the saved cache is 67 and Compacted row mean size: 355. No jamm errors in the log

Config notes:
row_cache_provider: ConcurrentLinkedHashCacheProvider
row_cache_size_in_mb: 2048

Version info:

• C*: 1.1.6
• centos 2.6.32-220.13.1.el6.x86_64
• java 6u31 Java HotSpot(TM) 64-Bit Server VM (build 20.6-b01, mixed mode)