[jira] [Created] (HDFS-12991) Ozone: Service Discovery: Limit number of datanodes (REST servers) returned by KeySpaceManager#getServiceList call

["Nanda kumar (JIRA)" <ji...@apache.org>]

Nanda kumar created HDFS-12991:
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             Summary: Ozone: Service Discovery: Limit number of datanodes (REST servers) returned by KeySpaceManager#getServiceList call
                 Key: HDFS-12991
                 URL: https://issues.apache.org/jira/browse/HDFS-12991
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ozone
            Reporter: Nanda kumar


To limit the number of datanodes (REST servers) returned by KeySpaceManager#getServiceList call we should use {{ozone.rest.servers}} property. The value for this property can be configured in the following 3 ways.

* List of machines
  Expressed as a hostname/IP of the machine followed by one or more machines which are comma separated.
* IP/netmask notation
  Single value that looks like 192.234.200.0/255.255.255.0, In this only nodes with the matching IP address specified by this netmask will appear.
* Regular expression which matches hostname
  This acts as a filter on the hostnames - For example datanode\[9?\].xxx.com - will expose only datanodes that are named datanode90,datanode91..etc(assuming datanodes are numbered using decimal in this example) nodes.

These node lists are exposed if and only if they are healthy by default.

All these three different forms are mutually exclusive and we will flag an error if more than one form is specified.

If the property is missing or if the value is empty, KSM will return all datanodes that are healthy.



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