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.sangbutsara...@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 <ake...@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 <sfhad...@gmail.com> wrote: > >> I hadn't. Thank you!!! Very helpful. > >> > >> Andy > >> > >> > >> On Wed, Oct 9, 2013 at 2:25 PM, Patai Sangbutsarakum > >> <patai.sangbutsara...@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 <sfhad...@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 > > an...@concurrentinc.com > > http://concurrentinc.com > >
