[ZOOKEEPER-427] ZooKeeper server unexpectedly high CPU utilisation

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 3.1.1
• Fix Version/s: 3.2.0

Environment

Linux: 2.6.18-92.1.18.el5 #1 SMP Wed Nov 12 09:19:49 EST 2008 x86_64 x86_64 x86_64 GNU/Linux
java version "1.6.0_03"
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_03-b05, mixed mode)

• Hadoop Flags: Reviewed
• Assignee: Flavio Paiva Junqueira
• Reporter: Satish Kotha
• Created: 02/Jun/09 21:01
• Updated: 11/Oct/10 07:34
• Resolved: 18/Jun/09 20:33

Description

I am running a 5 node ZooKeeper cluster and I noticed that one of them has very high CPU usage:

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6883 infact 22 0 725m 41m 4188 S 95 0.5 5671:54 java

It is not "doing anything" application-wise at this point, so I was wondering why the heck it's using up so much CPU.

Issue Links

• is related to: DIRMINA-678 NioProcessor 100% CPU usage on Linux (epoll selector bug)
• relates to: ZOOKEEPER-287 high cpu utilization caused by nioserver factory thread
• relates to: ZOOKEEPER-893 ZooKeeper high cpu usage when invalid requests