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From "Terry P." <texpi...@gmail.com>
Subject Re: Standby GC OutOfMemoryError
Date Fri, 13 Dec 2013 21:17:59 GMT
Hi Eric,
Did your standby GC eventually fail on you with an OOME?

I was able to reproduce the standby GC failure after about 6 days running
in standby mode again on my Ops cluster after a cluster restart following
the Thanksgiving holiday week.

Thanks,
Terry



On Wed, Dec 4, 2013 at 4:33 PM, Terry P. <texpilot@gmail.com> wrote:

> Thanks for testing Eric. I have nproc set hard to 32000 on all my nodes,
> and just double checked it's correct on the Secondary Namenode where this
> is happening on. nofile is set hard to 64000 so it's not a files/sockets
> issue either.
>
> Please let me know if it eventually fails for you.
>
>
>
> On Wed, Dec 4, 2013 at 3:41 PM, Eric Newton <eric.newton@gmail.com> wrote:
>
>> I fired up a standby GC after I reduced the wait time between zookeeper
>> lock checks to 10ms, and changed the memory from 256M to 56M.  It's been
>> running for the last hour.  I didn't expect it to fail, but I wanted to
>> make sure it wasn't reproducible.
>>
>> It's possible that you are running up against an nproc limit.   We've
>> seen out of memory issues when the JVM can't create a new thread.
>>
>> (I ran the test with 1.4.5-SNAPSHOT)
>>
>> -Eric
>>
>>
>> On Wed, Dec 4, 2013 at 2:31 PM, Eric Newton <eric.newton@gmail.com>wrote:
>>
>>> I don't know if anyone is running a standby GC.  Can you go ahead and
>>> open a ticket?
>>>
>>> -Eric
>>>
>>>
>>>
>>> On Wed, Dec 4, 2013 at 2:29 PM, Terry P. <texpilot@gmail.com> wrote:
>>>
>>>> Greetings folks,
>>>> With Accumulo 1.4.2 I'm running Standby Master and GC processes on my
>>>> Secondary Namenode. I've found that my Standby GC gets terminated due to
>>>> OutOfMemoryError errors after about 6 days of running, even though it is
>>>> running in standby mode only. The Standby Master is still running fine
>>>> after 3 weeks of standby mode.
>>>>
>>>> My accumulo-env.sh script is using the 3GB environment default GC
>>>> memory options of -Xmx256m -Xms256m, same as on the Master where the
>>>> primary GC runs and has never gotten an OOME. At this point I don't see any
>>>> reason to try increasing that as my bet is it will only delay the OOME.
>>>>
>>>> Anyone else running standby GC and running into this (or working fine)?
>>>>
>>>
>>>
>>
>

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