Github user shaneknapp commented on the issue:
https://github.com/apache/spark/pull/18283
ok, i just took a closer look on that worker (amp-jenkins-worker-08) and
somehow the /etc/alternatives/jar entry is missing (which is in turn linked to
/usr/bin/jar). all the other workers are properly set up.
i'll get amp-jenkins-worker-08 fixed right now.
sidenote: new jenkins coming soon, and i can't wait to get rid of these
crusty old centos 6 boxen for shiny new ubuntu 16 LTS.
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