[SOLR-9335] Move solr stats collections to use LongAdder

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 6.2, 7.0
• Assignee: Varun Thacker
• Reporter: Varun Thacker
• Created: 24/Jul/16 17:17
• Updated: 21/Nov/19 00:41
• Resolved: 26/Jul/16 13:00

Description

With Java 8 we can use LongAdder which has more throughput under high contention .

These classes of Solr should benefit from LongAdder

• Caches ( ConcurentLRUCache / LRUCache )
• Searches ( RequestHandlerBase )
• Updates ( DirectUpdateHandler2 )