[CASSANDRA-1155] keep persistent row statistics

• Type: Sub-task
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 0.7 beta 1
• Assignee: Brandon Williams
• Reporter: Jonathan Ellis

Authors

Brandon Williams

• Created: 03/Jun/10 05:40
• Updated: 16/Apr/19 09:33
• Resolved: 23/Jul/10 19:25

Description

during flush and compaction we should keep row size statistics using EstimatedHistogram (column count, and row size), replacing min/max/total sizes in CFS.

having this detail will let us estimate, given an index CF, how many nodes we need to query to get the number of matching rows requested by the client.