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https://issues.apache.org/jira/browse/BIGTOP-1011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13694843#comment-13694843
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Sean Mackrory commented on BIGTOP-1011:
---------------------------------------
I'll need to do some experimenting to see if I can verify how much of my
speculation is true, but here's my speculation anyway:
* Regarding defaults: Some systems will, by necessity, have a JDK we don't
support installed by the host OS, and links like /usr/java/default may be
maintained by those packages. In such instances, it is probably correct to
default to a version we explicitly support first, then to the generic links,
then to other common links that we explicitly don't support.
* I agree this is a problem, and I'll see if I can tweak our algorithm to use a
reverse alphanumeric sort...
* AFAIK when it comes to Hadoop, Oracle Java 6 > Oracle Java 7, OpenJDK 6 <
OpenJDK 7, and Oracle JDK * > OpenJDK *. I may be wrong
> bigtop-detect-javahome has a quirky search order
> ------------------------------------------------
>
> Key: BIGTOP-1011
> URL: https://issues.apache.org/jira/browse/BIGTOP-1011
> Project: Bigtop
> Issue Type: Bug
> Reporter: Jolly Chen
> Assignee: Sean Mackrory
>
> If JAVA_HOME is not set, bigtop-detect-javahome has a very quirky search
> order that can have surprising behavior.
> Some problems:
> - because the "defaults" (like /usr/java/default,
> /usr/lib/jvm/default-java, /Library/Java/Home) are in the middle of the
> search list, bigtop will pick up other random JDKs instead of the 'default'
> the user already has set up on the system.
> - due to use of wildcards, earlier minor versions can be preferred over
> later minor versions, e.g. /usr/java/jdk1.6* will find 1.6.0_31 before
> 1.6.0_43, which is probably not what the user wants.
> - 1.6 and 1.7 preference order is not consistent (e.g. generally 1.6 is
> preferred over 1.7 but not for openJDK)
> This is related to previous issue:
> https://issues.apache.org/jira/browse/BIGTOP-843
> # attempt to find java
> if [ -z "$JAVA_HOME" ]; then
> for candidate in \
> /usr/lib/j2sdk1.6-sun \
> /usr/lib/jvm/java-6-sun \
> /usr/lib/jvm/java-1.6.0-sun-1.6.0.* \
> /usr/lib/jvm/java-1.6.0-sun-1.6.0.*/jre/ \
> /usr/lib/jvm/j2sdk1.6-oracle \
> /usr/lib/jvm/j2sdk1.6-oracle/jre \
> /usr/java/jdk1.6* \
> /usr/java/jre1.6* \
> /usr/java/jdk1.7* \
> /usr/java/jre1.7* \
> /usr/lib/jvm/j2sdk1.7-oracle \
> /usr/lib/jvm/j2sdk1.7-oracle/jre \
> /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-1.7.0-openjdk* \
> /usr/lib/jvm/java-7-openjdk* \
> /usr/lib/jvm/java-7-oracle* \
> /usr/lib/jvm/java-1.6.0-openjdk \
> /usr/lib/jvm/java-1.6.0-openjdk-* \
> /usr/lib/jvm/jre-1.6.0-openjdk* ; do
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