Major Description
There is a spurious error when stopping a secure datanode.
# hdfs --daemon stop datanode cat: /var/run/hadoop/hdfs//hadoop-hdfs-root-datanode.pid: No such file or directory WARNING: pid has changed for datanode, skip deleting pid file cat: /var/run/hadoop/hdfs//hadoop-hdfs-root-datanode.pid: No such file or directory WARNING: daemon pid has changed for datanode, skip deleting daemon pid file
The error appears benign. The service was stopped correctly.