elek opened a new pull request #1115:
URL: https://github.com/apache/hadoop-ozone/pull/1115


   …
   since the service names are same and they both referring to same location 
for pid files, we can not start both services at once.
   
   Tweak is to export HADOOP_PID_DIR to different location after starting one 
service and start other one.
   
   It would be better to have different pid file names.
   
   ```
   Umas-MacBook-Pro ozone-0.5.0-beta % bin/ozone --daemon start datanode
   datanode is running as process 25167.  Stop it first.
   ```
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/HDDS-3632
   
   ## How was this patch tested?
   
    1. Started a new cluster with `compose/ozonescripts`
    2. Fixed the configuration (will be uploaded in a separated jira)
    3. Used `./start.sh`
    4. Checked if cluster works (ozone sh + volume, bucket, key create)
    5. Checked if the /tmp/*.pid contains ozone name on the datanodes.


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