[DAEMON-355] the process created by jsvc can't read some os file like /proc/[pid]/io

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 1.0.13
• Component/s: Jsvc

Environment

SUSE Linux Enterprise Server 11 SP3 (x86_64) - Kernel

• Assignee: Unassigned
• Reporter: hu xiaodong
• Created: 09/Sep/16 03:08
• Updated: 04/Nov/16 10:42
• Resolved: 04/Nov/16 10:42

Description

I started hadoop hdfs with jsvc by root.
command is:
exec "$JSVC" \
-Dproc_$COMMAND -outfile "$JSVC_OUTFILE" \
-errfile "$JSVC_ERRFILE" \
-pidfile "$HADOOP_SECURE_DN_PID" \
-nodetach \
-user "$HADOOP_SECURE_DN_USER" \
-cp "$CLASSPATH" \
$JAVA_HEAP_MAX $HADOOP_OPTS \
org.apache.hadoop.hdfs.server.datanode.SecureDataNodeStarter "$@".

the parameter $HADOOP_SECURE_DN_USER is hdfs.

Then there will be to proceses in the system.one is owned by root, another is owned by hdfs, but the process of hdfs can not read /proc/[pid]/io file, because this file is owned by root.