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From "xiaodong.hu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10849) the datanode process created by jsvc can't read some os file like /proc/[pid]/io
Date Fri, 09 Sep 2016 03:24:20 GMT
xiaodong.hu created HDFS-10849:
----------------------------------

             Summary: the datanode process created by jsvc can't read some os file like /proc/[pid]/io
                 Key: HDFS-10849
                 URL: https://issues.apache.org/jira/browse/HDFS-10849
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 2.6.0
         Environment: SUSE Linux Enterprise Server 11 SP3  (x86_64) - Kernel
            Reporter: xiaodong.hu
            Priority: Minor


start datanode with security mode.
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 owned by hdfs can not read /proc/[pid]/io file, because this file is owned
by root.



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