[CASSANDRA-7974] Enable tooling to detect hot partitions

• Type: Improvement
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 2.1.3
• Assignee: Chris Lohfink
• Reporter: Brandon Williams

Authors

Chris Lohfink

Reviewers

Brandon Williams

• Created: 18/Sep/14 21:23
• Updated: 16/Apr/19 09:31
• Resolved: 21/Jan/15 17:49

Description

Sometimes you know you have a hot partition by the load on a replica set, but have no way of determining which partition it is. Tracing is inadequate for this without a lot of post-tracing analysis that might not yield results. Since we already include stream-lib for HLL in compaction metadata, it shouldn't be too hard to wire up topK for X seconds via jmx/nodetool and then return the top partitions hit.

Issue Links

• is a clone of: CASSANDRA-7247 Provide top ten most frequent keys per column family
• is duplicated by: CASSANDRA-8195 Tools for discovering problem/largest partitions
• is duplicated by: CASSANDRA-8381 CFStats should record keys of largest N requests for time interval