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From David Daeschler <>
Subject Re: Oftopic: ksoftirqd after ddos take more cpu? as result cassandra latensy very high
Date Sun, 01 Jul 2012 17:33:34 GMT
Good afternoon,

This again looks like it could be the leap second issue:

This looks like the problem a bunch of us were having yesterday that
isn't cleared without a reboot or a date command. It seems to be
related to the leap second that was added between the 30th June and
the 1st of July.

See the mailing list thread with subject "High CPU usage as of 8pm eastern time"

If you are seeing high CPU usage and a stall after restarting
cassandra still, and you are on Linux, try:

date; date `date +"%m%d%H%M%C%y.%S"`; date;

In a terminal and see if everything starts working again.

I hope this helps. Please spread the word if you see others having
issues with unresponsive kernels/high CPU.

David Daeschler

On Sun, Jul 1, 2012 at 1:05 PM, ruslan usifov <> wrote:
> Hello
> We was under ddos attack, and as result we got high ksoftirqd activity
> - as result cassandra begin answer very slow. But when ddos was gone
> high ksoftirqd activity still exists, and dissaper when i stop
> cassandra daemon, and repeat again when i start cassadra daemon, the
> fully resolution of problem is full reboot of server. What this can be
> (why ksoftirqd begin work very intensive when cassandra runing - we
> disable all working traffic to cluster but this doesn't help so this
> is can't be due heavy load )? And how to solve this?
> PS:
>      OS ubuntu 10.0.4 (
>      cassandra 1.0.10
>      java 1.6.32 (from oracle)

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