cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Patrick McFadin <>
Subject Re: CPU high load
Date Wed, 13 Jul 2016 16:15:16 GMT
Might be more clear looking at nodetool tpstats

>From there you can see all the thread pools and if there are any blocks.
Could be something subtle like network.

On Tue, Jul 12, 2016 at 3:23 PM, Aoi Kadoya <> wrote:

> Hi,
> I am running 6 nodes vnode cluster with DSE 4.8.1, and since few weeks
> ago, all of the cluster nodes are hitting avg. 15-20 cpu load.
> These nodes are running on VMs(VMware vSphere) that have 8vcpu
> (1core/socket)-16 vRAM.(JVM options : -Xms8G -Xmx8G -Xmn800M)
> At first I thought this is because of CPU iowait, however, iowait is
> constantly low(in fact it's 0 almost all time time), CPU steal time is
> also 0%.
> When I took a thread dump, I found some of "SharedPool-Worker" threads
> are consuming CPU and those threads seem to be waiting for something
> so I assume this is the cause of cpu load.
> "SharedPool-Worker-1" #240 daemon prio=5 os_prio=0
> tid=0x00007fabf459e000 nid=0x39b3 waiting on condition
> [0x00007faad7f02000]
>    java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> at java.util.concurrent.locks.LockSupport.park(
> at
> at
> Thread dump looks like this, but I am not sure what is this
> sharedpool-worker waiting for.
> Would you please help me with the further trouble shooting?
> I am also reading the thread posted by Yuan as the situation is very
> similar to mine but I didn't get any blocked, dropped or pending count
> in my tpstat result.
> Thanks,
> Aoi

View raw message