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From "J. Ryan Earl" <...@jryanearl.us>
Subject Re: Java version with Hadoop 2.0
Date Thu, 10 Oct 2013 15:22:54 GMT
We recently switched all our productions clusters to JDK7 off the EOL JDK6.
 The one big gotcha, and this was -not- specifically a problem with the
Hadoop framework but you may have issues with your own applications or
clients is the with the Java 7 "bytecode verifier" which can be disabled
with "-XX:-UseSplitVerifier":
http://chrononsystems.com/blog/java-7-design-flaw-leads-to-huge-backward-step-for-the-jvm

-JR


On Wed, Oct 9, 2013 at 5:57 PM, Patai Sangbutsarakum <
Patai.Sangbutsarakum@turn.com> wrote:

> Does that mean for the new cluster, we probably try to start to aim to
> test/use/deploy at java 7?
>
>
> On Oct 9, 2013, at 3:05 PM, Andre Kelpe <akelpe@concurrentinc.com>
>  wrote:
>
> > also keep in mind, that java 6 no longer gets "public" updates from
> > Oracle: http://www.oracle.com/technetwork/java/eol-135779.html
> >
> > - André
> >
> > On Wed, Oct 9, 2013 at 11:48 PM, SF Hadoop <sfhadoop@gmail.com> wrote:
> >> I hadn't.  Thank you!!!  Very helpful.
> >>
> >> Andy
> >>
> >>
> >> On Wed, Oct 9, 2013 at 2:25 PM, Patai Sangbutsarakum
> >> <Patai.Sangbutsarakum@turn.com> wrote:
> >>>
> >>> maybe you've already seen this.
> >>>
> >>> http://wiki.apache.org/hadoop/HadoopJavaVersions
> >>>
> >>>
> >>> On Oct 9, 2013, at 2:16 PM, SF Hadoop <sfhadoop@gmail.com>
> >>> wrote:
> >>>
> >>> I am preparing to deploy multiple cluster / distros of Hadoop for
> testing
> >>> / benchmarking.
> >>>
> >>> In my research I have noticed discrepancies in the version of the JDK
> that
> >>> various groups are using.  Example:  Hortonworks is suggesting
> JDK6u31, CDH
> >>> recommends either 6 or 7 providing you stick to some guidelines for
> each and
> >>> Apache Hadoop seems to be somewhat of a "no mans land"; a lot of people
> >>> using a lot of different versions.
> >>>
> >>> Does anyone have any insight they could share about how to approach
> >>> choosing the best JDK release?  (I'm a total Java newb, so any info /
> >>> further reading you guys can provide is appreciated.)
> >>>
> >>> Thanks.
> >>>
> >>> sf
> >>>
> >>>
> >>
> >
> >
> >
> > --
> > André Kelpe
> > andre@concurrentinc.com
> > http://concurrentinc.com
>
>

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