[ACCUMULO-1062] large numbers of threads make in-memory updates slow

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 1.4.2
• Fix Version/s: 1.4.3, 1.5.0
• Component/s: tserver

Environment

testing on large clusters

• Assignee: Eric C. Newton
• Reporter: Eric C. Newton
• Created: 12/Feb/13 22:29
• Updated: 20/Nov/13 05:40
• Resolved: 21/Feb/13 14:52

Description

Using hundreds of ingest programs, each running several batch writers, ingest would eventually become slow. Testing (attached) proved that performance fell off as the number of threads increased.

Issue Links

• is duplicated by: ACCUMULO-893 splitting and hold time are interacting badly