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https://issues.apache.org/jira/browse/BIGTOP-843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13581446#comment-13581446
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Sean Mackrory commented on BIGTOP-843:
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Hadoop will need to run well on JDK 7 sooner or later, so I'm hesitant to cut
that off (I try to use JDK 7 when I can) and I don't know if any contributors
or downstream projects / users are using 32-bit, but personally I'm okay with
cutting that off. In my opinion, serious users should be explicitly specifying
the JDK to be used in /etc/default/bigtop-utils anyway, so maybe we should make
that a more obvious step in the process of getting Bigtop up and running? If
somebody wants to run Bigtop on JDK 7 or 32-bit, I don't think bigtop-utils
should be getting in the way unnecessarily, but if it really makes a big
difference in terms of working well out-of-the-box for a lot of people, I'm not
opposed to it.
> It would be really cool if bigtop-detect-javahome were smarter and didn't
> pick a 32-bit JVM, or a 1.7 JVM set with default
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: BIGTOP-843
> URL: https://issues.apache.org/jira/browse/BIGTOP-843
> Project: Bigtop
> Issue Type: Improvement
> Components: General
> Affects Versions: 0.5.0
> Reporter: Robert Justice
> Assignee: Mark Grover
>
> I see more and more folks with whacked versions of java configured in
> /usr/java/default or /usr/lib/jvm/default-java that are pointing to 32-bit
> JVMs or are simply not even a 1.6 JVM. I was wondering if we could do a bit
> more intelligence in this script and run a java -version to rule out a 32-bit
> JVM or a 1.7 JDK? Or would that be too error prone?
> if [ -z "$JAVA_HOME" ]; then
> for candidate in \
> /usr/lib/jvm/java-6-sun \
> /usr/lib/jvm/java-1.6.0-sun-1.6.0.*/jre/ \
> /usr/lib/jvm/java-1.6.0-sun-1.6.0.* \
> /usr/lib/jvm/j2sdk1.6-oracle \
> /usr/lib/jvm/j2sdk1.6-oracle/jre \
> /usr/lib/j2sdk1.6-sun \
> /usr/java/jdk1.6* \
> /usr/java/jre1.6* \
> /Library/Java/Home \
> /usr/java/default \
> /usr/lib/jvm/default-java \
> /usr/lib/jvm/java-openjdk \
> /usr/lib/jvm/jre-openjdk \
> /usr/lib/jvm/java-1.6.0-openjdk-1.6.* \
> /usr/lib/jvm/jre-1.6.0-openjdk* ; do
> if [ -e $candidate/bin/java ]; then
> export JAVA_HOME=$candidate
> break
> fi
> done
> fi
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