See <https://builds.apache.org/job/Pig-trunk-commit/2496/display/redirect?page=changes>
- Jenkins build is unstable: Pig-trunk-commit #2496 Apache Jenkins Server
- Build failed in Jenkins: Pig-trunk-commit #2497 Apache Jenkins Server
- Build failed in Jenkins: Pig-trunk-commit #... Apache Jenkins Server
- Jenkins build is back to normal : Pig-t... Apache Jenkins Server