[ACCUMULO-49] optionally monitor swappiness on every server

• Type: New Feature
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.4.1, 1.5.0
• Component/s: logger, master, trace, tserver

Environment

idle tablet server is swapped out on an otherwise busy system

• Assignee: Eric C. Newton
• Reporter: Eric C. Newton
• Created: 19/Oct/11 16:31
• Updated: 02/May/12 15:16
• Resolved: 02/May/12 15:16

Description

Linux kernel will eagerly swap idle memory (such as the tablet server) for disk cache unless the /proc/sys/vm/swappiness setting is set to 0. A swapped-out server is sluggish enough that it loses its zookeeper lock.