[BIGTOP-2519] JAVA_HOME not detected correctly for openjdk 8

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Not A Bug
• Affects Version/s: 1.1.0
• Component/s: hadoop
• Assignee: Pete Vander Giessen
• Reporter: Pete Vander Giessen
• Created: 24/Aug/16 16:18
• Updated: 17/Sep/18 16:46
• Resolved: 17/Sep/18 16:46

Description

I'm running into an issue where the hadoop namenode fails to start hdfs when using openjdk 8. It appears to be because the namenode scripts rely on the bigtop-detect-javahome script in bigtop_utils, which doesn't detect JAVA_HOME correctly for openjdk 8.

I'd like to modify the script so that it first tries to figure out java home by looking in /etc/alternatives and deriving JAVA_HOME from the symlink to the java executable. This should work on both Redhat and Debian based distros, in a forwards compatible way. The script would fall back to the more manual process for distros that don't use /etc/alternatives.

Will submit a patch soon ....