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From "pankaj mishra (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-9578) CPU hogging by cassandra while starting.
Date Thu, 11 Jun 2015 05:05:00 GMT
pankaj mishra created CASSANDRA-9578:

             Summary: CPU hogging by cassandra while starting.
                 Key: CASSANDRA-9578
             Project: Cassandra
          Issue Type: Bug
            Reporter: pankaj mishra

The problem we experience is that just after starting cassandra, the cpu utilization by java
program (cassandra service) increases insanely (100-300%) and cassandra server startup process
gets delayed forever.  It does not happen every time we start. Many a times it starts just

We also observed that while cluster is running fine with every node is in UN mode, after one
or two days (time period is not fixed) few nodes goes into DN mode in nodetool status on their
own, even though we are not reading any data or even writing any data.

We just wanted to know that is there any corner case bug in cassandra that might be the reason
for this kind of behavior?

The version of cassandra server along with all environment information is given below.

Cassandra server version  2.0.14

JDK version 
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

unama -a
Linux  2.6.32-504.16.2.el6.x86_64 #1 SMP Wed Apr 22 06:48:29 UTC 2015 x86_64 x86_64 x86_64

blockdev --getra /dev/sdb1 (cassandra data directory)

 blockdev --getra /dev/sda2  (cassandra commitlog directory)


lbs_release -a
LSB Version:	:base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor ID:	CentOS
Description:	CentOS release 6.6 (Final)
Release:	6.6
Codename:	Final


We are using following version of cassandra on vm with following version of os.

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