[CASSANDRA-15194] Improve readability of Table metrics Virtual tables units

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 4.0, 4.0-alpha1
• Component/s: Feature/Virtual Tables
• Bug Category: Correctness
• Severity: Low
• Complexity: Low Hanging Fruit
• Discovered By: User Report
• Platform: All
• Since Version: 4.x

Source Control Link

https://github.com/apache/cassandra/commit/9a175a1697b1107fb63480fb86ffe37b02122267

Test and Documentation Plan

unit tests and circleci

• Assignee: Chris Lohfink
• Reporter: Jon Haddad

Authors

Chris Lohfink

Reviewers

Benedict Elliott Smith, Jon Haddad

• Created: 02/Jul/19 16:23
• Updated: 15/May/20 08:04
• Resolved: 12/Aug/19 18:30

Description

I just noticed this strange output in the coordinator_reads output::

cqlsh:system_views> select * from coordinator_reads ;

 count | keyspace_name      | table_name                     | 99th | max | median | per_second
-------+--------------------+--------------------------------+------+-----+--------+------------
  7573 |         tlp_stress |                       keyvalue |    0 |   0 |      0 | 2.2375e-16
  6076 |         tlp_stress |                  random_access |    0 |   0 |      0 | 7.4126e-12
   390 |         tlp_stress |                sensor_data_udt |    0 |   0 |      0 | 1.7721e-64
    30 |             system |                          local |    0 |   0 |      0 |   0.006406
    11 |      system_schema |                        columns |    0 |   0 |      0 | 1.1192e-16
    11 |      system_schema |                        indexes |    0 |   0 |      0 | 1.1192e-16
    11 |      system_schema |                         tables |    0 |   0 |      0 | 1.1192e-16
    11 |      system_schema |                          views |    0 |   0 |      0 | 1.1192e-16

cc Chris Lohfink

btw I realize the output is technically correct, but it's not very readable. For practical purposes this should just say 0.

Issue Links

• links to: GitHub Pull Request #331