[CASSANDRA-9811] Tie counter shards' logical clock value to timestamps

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 3.8
• Assignee: Aleksey Yeschenko
• Reporter: Aleksey Yeschenko

Authors

Aleksey Yeschenko

Reviewers

Sam Tunnicliffe

• Created: 14/Jul/15 23:04
• Updated: 16/Apr/19 09:31
• Resolved: 03/Jun/16 21:46

Description

CASSANDRA-6506 will get rid of counter shards, turning them into elements of a map. And we'll be using the logical clock values as map element timestamps.

To avoid unpleasant initial performance (being unable to perform certain sstable optimisations on the read path), we should switch the shards to use max(timestamp, clock + 1) now, in advance of CASSANDRA-6506 switch.

Issue Links

• is depended upon by: CASSANDRA-6506 counters++ split counter context shards into separate cells
• relates to: CASSANDRA-11432 Counter values become under-counted when running repair.