See <https://builds.apache.org/job/kafka-trunk-jdk7/2696/display/redirect?page=changes>
- Build failed in Jenkins: kafka-trunk-jdk7 #2691 Apache Jenkins Server
- Build failed in Jenkins: kafka-trunk-jdk7 #2692 Apache Jenkins Server
- Build failed in Jenkins: kafka-trunk-jdk7 #... Apache Jenkins Server
- Build failed in Jenkins: kafka-trunk-jd... Apache Jenkins Server
- Build failed in Jenkins: kafka-trun... Apache Jenkins Server
- Jenkins build is back to norma... Apache Jenkins Server
