Apache Hadoop qbt Report: branch-2.10+JDK7 on Linux/x86_64

For more details, see https://ci-hadoop.apache.org/job/hadoop-qbt-branch-2.10-java7-linux-x86_64/241/ [Mar 17, 2021 6:16:18 AM] (Takanobu Asanuma) HDFS-15895 : Remove redundant String#format in DFSAdmin#printOpenFiles (#2772) [Mar 17, 2021 7:34:52 AM] (Akira Ajisaka) HDFS-13975. TestBalancer#te

Apache Hadoop qbt Report: trunk+JDK8 on Linux/x86_64

For more details, see https://ci-hadoop.apache.org/job/hadoop-qbt-trunk-java8-linux-x86_64/450/ [Mar 17, 2021 3:00:05 AM] (noreply) HDFS-13975. TestBalancer#testMaxIterationTime fails sporadically (#2726) [Mar 17, 2021 5:14:26 AM] (Takanobu Asanuma) HDFS-15890. Improve the Logs for File Concat