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From Elliott Clark <ecl...@apache.org>
Subject Re: (HBASE-5261)HBase 0.94 cerification for JDK7
Date Wed, 04 Sep 2013 06:29:55 GMT
Of course.  I'll reply back when I have definitive results

On Tue, Sep 3, 2013 at 11:17 PM, anil gupta <anilgupta84@gmail.com> wrote:
> Inline.
>
> On Tue, Sep 3, 2013 at 11:04 PM, Elliott Clark <eclark@apache.org> wrote:
>
>> So since the first question is vendor specific, lets take that off list.
>>
>> The core dumps are mostly while starting a region server up under
>> load, but they are concerning.  They are on JDK 1.7.15, which isn't
>> the newest. So I'm hoping that release 25 will help.
>>
> Anil: Yes, trying out 25 will be better. It would be great if you can share
> your results whenever your try out 1.7u25. Meanwhile, i will also try to do
> the same in my environment.
>
>>
>> I also run YCSB on the cluster after all the tests and during those
>> runs the region servers have been very stable.
>>
>> On Tue, Sep 3, 2013 at 10:42 PM, anil gupta <anilgupta84@gmail.com> wrote:
>> > Hi Elliot,
>> >
>> > That's cool!
>> > We have CDH Enterprise license. Would you mind pointing me to the
>> doc/link
>> > that states same?
>> > However, core dumps sounds bad for prod environment. Are there any
>> specific
>> > patterns for core-dumps? Does it only happens under very heavy load? If
>> > yes, then how much read/write load?
>> >
>> > If you want to take this offline, i am fine with that also.
>> >
>> > Thanks,
>> > Anil
>> >
>> >
>> > On Tue, Sep 3, 2013 at 10:26 PM, Elliott Clark <eclark@apache.org>
>> wrote:
>> >
>> >> Cloudera (my employer) has certified their distribution(CDH4.2+) on
>> >> JDK7.  That includes HBase 94.  I'm sure they would answer questions
>> >> about what was tested, on their mailing lists or forums.
>> >>
>> >> I imagine that Hortonworks has done similar testing though I am not as
>> >> well versed in it.
>> >>
>> >> I personally been running a test cluster with Integration tests (for
>> >> 0.96) on jdk7, G1 gc, and 30 gig heaps for a couple of months now.
>> >> There have been a couple of times that the region servers have core
>> >> dumped because of the JVM.  However I would say the region servers are
>> >> some what stable with JDK 1.07.15 and the G1gc. My test cluster is
>> >> pretty taxed and your milage might vary; it's worth testing on your
>> >> workload.
>> >>
>> >> I'm currently upgrading the jvm to release 25 hoping that the core
>> >> dumps will be solved.
>> >>
>> >> On Tue, Sep 3, 2013 at 10:06 PM, anil gupta <anilgupta84@gmail.com>
>> wrote:
>> >> > Also, if HBase0.94 is officially certified to work with JDK7 then it
>> will
>> >> > save duplicate work from Individual users like me and you. Currently
>> GC
>> >> > with big JVM heaps is a big concern with HBase. If users will get
>> options
>> >> > to use G1GC then it might alleviate some pains of many HBase users.
>> >> >
>> >> >
>> >> > On Tue, Sep 3, 2013 at 10:03 PM, anil gupta <anilgupta84@gmail.com>
>> >> wrote:
>> >> >
>> >> >> Hi Lars,
>> >> >>
>> >> >> Even if we setup Jenkins with JDK7 then also we wont be able to
use
>> JDK7
>> >> >> in prod HBase cluster. Beacuse, as per our process, we can only
use
>> the
>> >> JDK
>> >> >> that is certified by Apache HBase. If we don't follow this rule
then
>> >> IT/DBA
>> >> >> folks wont support us. That's why i am looking for JDK7
>> certification of
>> >> >> HBase0.94. It would be great if an official certification can be
>> done.
>> >> >>
>> >> >> Thanks,
>> >> >> Anil
>> >> >>
>> >> >>
>> >> >> On Tue, Sep 3, 2013 at 5:35 PM, lars hofhansl <larsh@apache.org>
>> wrote:
>> >> >>
>> >> >>> We (Salesforce) are using HBase with JDK7. No issues seen so
far.
>> >> >>>
>> >> >>> 0.94 is not "officially certified" to work on JDK7 (we have
no JDK7
>> >> >>> jenkins, etc).
>> >> >>>
>> >> >>> It might be good to setup a JDK7 jenkins for 0.94. Any objections
to
>> >> >>> doing that?
>> >> >>>
>> >> >>> -- Lars
>> >> >>>
>> >> >>>
>> >> >>>
>> >> >>> ----- Original Message -----
>> >> >>> From: anil gupta <anilgupta84@gmail.com>
>> >> >>> To: "user@hbase.apache.org" <user@hbase.apache.org>
>> >> >>> Cc:
>> >> >>> Sent: Tuesday, September 3, 2013 4:26 PM
>> >> >>> Subject: (HBASE-5261)HBase 0.94 cerification for JDK7
>> >> >>>
>> >> >>> Hi All,
>> >> >>>
>> >> >>> We are thinking of running HBase(we have JVM heaps larger than
25
>> GB)
>> >> with
>> >> >>> JDK7 to use G1 garbage collection, but as a precaution we would
like
>> >> HBase
>> >> >>> to be certified with JDK7. I see this ticket for same:
>> >> >>> https://issues.apache.org/jira/browse/HBASE-5261
>> >> >>> Above havent had any activity from November, 2012. Are there
any
>> >> timelines
>> >> >>> to certify HBase 0.94 with JDK7?
>> >> >>>
>> >> >>> --
>> >> >>> Thanks & Regards,
>> >> >>> Anil Gupta
>> >> >>>
>> >> >>>
>> >> >>
>> >> >>
>> >> >> --
>> >> >> Thanks & Regards,
>> >> >> Anil Gupta
>> >> >>
>> >> >
>> >> >
>> >> >
>> >> > --
>> >> > Thanks & Regards,
>> >> > Anil Gupta
>> >>
>> >
>> >
>> >
>> > --
>> > Thanks & Regards,
>> > Anil Gupta
>>
>
>
>
> --
> Thanks & Regards,
> Anil Gupta

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