[CASSANDRA-11420] Add the JMX metrics to track the write amplification of C*

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 3.6
• Assignee: Dikang Gu
• Reporter: Dikang Gu

Authors

Dikang Gu

Reviewers

Marcus Eriksson

• Created: 24/Mar/16 02:36
• Updated: 16/Apr/19 09:30
• Resolved: 29/Mar/16 07:18

Description

2016-03-24_02:30:38.39936 INFO 02:30:38 Completed flushing /data/cassandra/data/keyspace/column-family/column-family-tmp-ka-295782-Data.db (73.266MiB) for commitlog position ReplayPosition(segmentId=1458717183630, position=3690)

It would be useful to expose the number of flushed bytes to JMX, so that we can monitor how many bytes are written by application and flushed to disk.

I also expose the number of bytes written by compaction to JMX, so the WA can be calculated by dividing these two metrics