See <https://sparktc.ibmcloud.com/jenkins/job/SystemML-DailyTest/1252/changes>
- Jenkins build became unstable: SystemML-DailyTest #1249 jenkins
- Jenkins build is still unstable: SystemML-DailyTest #1250 jenkins
- Jenkins build is still unstable: SystemML-DailyTest #1251 jenkins
- Jenkins build is back to stable : SystemML-DailyTest ... jenkins