[ZOOKEEPER-287] high cpu utilization caused by nioserver factory thread

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Duplicate
• Affects Version/s: 3.0.1
• Fix Version/s: 3.3.0
• Component/s: server

Environment

Linux 2.6.9-67.ELsmp #1 SMP Wed Nov 7 13:58:04 EST 2007 i686 i686 i386 GNU/Linux
the servers were running in vmware vms
java version "1.6.0_06"
Java(TM) SE Runtime Environment (build 1.6.0_06-b02)
Java HotSpot(TM) Client VM (build 10.0-b22, mixed mode)

• Release Note: Marking as 3.2 -- we should resolve or close this as unreproduceable.
• Assignee: Unassigned
• Reporter: Patrick D. Hunt
• Created: 03/Feb/09 05:26
• Updated: 26/Mar/10 17:24
• Resolved: 14/Oct/09 16:59

Description

a user reported that a long running server, part of a 2 server ensemble, started using 100%cpu (1 server of the ensemble, the other was fine).

mahadev tracked it down to a thread in the server running epoll in a tight loop - the thread was the nio server factory thread that selects on client fds.

Issue Links

• is related to: ZOOKEEPER-427 ZooKeeper server unexpectedly high CPU utilisation