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From Jaikiran Pai <jai.forums2...@gmail.com>
Subject Re: Increased CPU usage with 0.8.2-beta
Date Tue, 03 Feb 2015 03:39:57 GMT
On Monday 02 February 2015 11:03 PM, Jun Rao wrote:
> Jaikiran,
>
> The fix you provided in probably unnecessary. The channel that we use in
> SimpleConsumer (BlockingChannel) is configured to be blocking. So even
> though the read from the socket is in a loop, each read blocks if there is
> no bytes received from the broker. So, that shouldn't cause extra CPU
> consumption.
Hi Jun,

Of course, you are right! I forgot that while reading the thread dump in 
hprof output, one has to be aware that the thread state isn't shown and 
the thread need not necessarily be doing any CPU activity.

-Jaikiran


>
> Thanks,
>
> Jun
>
> On Mon, Jan 26, 2015 at 10:05 AM, Mathias Söderberg <
> mathias.soederberg@gmail.com> wrote:
>
>> Hi Neha,
>>
>> I sent an e-mail earlier today, but noticed now that it didn't actually go
>> through.
>>
>> Anyhow, I've attached two files, one with output from a 10 minute run and
>> one with output from a 30 minute run. Realized that maybe I should've done
>> one or two runs with 0.8.1.1 as well, but nevertheless.
>>
>> I upgraded our staging cluster to 0.8.2.0-rc2, and I'm seeing the same CPU
>> usage as with the beta version (basically pegging all cores). If I manage
>> to find the time I'll do another run with hprof on the rc2 version later
>> today.
>>
>> Best regards,
>> Mathias
>>
>> On Tue Dec 09 2014 at 10:08:21 PM Neha Narkhede <neha@confluent.io> wrote:
>>
>>> The following should be sufficient
>>>
>>> java
>>> -agentlib:hprof=cpu=samples,depth=100,interval=20,lineno=
>>> y,thread=y,file=kafka.hprof
>>> <classname>
>>>
>>> You would need to start the Kafka server with the settings above for
>>> sometime until you observe the problem.
>>>
>>> On Tue, Dec 9, 2014 at 3:47 AM, Mathias Söderberg <
>>> mathias.soederberg@gmail.com> wrote:
>>>
>>>> Hi Neha,
>>>>
>>>> Yeah sure. I'm not familiar with hprof, so any particular options I
>>> should
>>>> include or just run with defaults?
>>>>
>>>> Best regards,
>>>> Mathias
>>>>
>>>> On Mon Dec 08 2014 at 7:41:32 PM Neha Narkhede <neha@confluent.io>
>>> wrote:
>>>>> Thanks for reporting the issue. Would you mind running hprof and
>>> sending
>>>>> the output?
>>>>>
>>>>> On Mon, Dec 8, 2014 at 1:25 AM, Mathias Söderberg <
>>>>> mathias.soederberg@gmail.com> wrote:
>>>>>
>>>>>> Good day,
>>>>>>
>>>>>> I upgraded a Kafka cluster from v0.8.1.1 to v0.8.2-beta and noticed
>>>> that
>>>>>> the CPU usage on the broker machines went up by roughly 40%, from
>>> ~60%
>>>> to
>>>>>> ~100% and am wondering if anyone else has experienced something
>>>> similar?
>>>>>> The load average also went up by 2x-3x.
>>>>>>
>>>>>> We're running on EC2 and the cluster currently consists of four
>>>>> m1.xlarge,
>>>>>> with roughly 1100 topics / 4000 partitions. Using Java 7 (1.7.0_65
>>> to
>>>> be
>>>>>> exact) and Scala 2.9.2. Configurations can be found over here:
>>>>>> https://gist.github.com/mthssdrbrg/7df34a795e07eef10262.
>>>>>>
>>>>>> I'm assuming that this is not expected behaviour for 0.8.2-beta?
>>>>>>
>>>>>> Best regards,
>>>>>> Mathias
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Thanks,
>>>>> Neha
>>>>>
>>>
>>>
>>> --
>>> Thanks,
>>> Neha
>>>


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