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From "Nanda kumar (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12991) Ozone: Service Discovery: Limit the number of datanodes (REST servers) returned by KeySpaceManager#getServiceList call
Date Fri, 02 Feb 2018 13:04:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nanda kumar updated HDFS-12991:
-------------------------------
    Summary: Ozone: Service Discovery: Limit the number of datanodes (REST servers) returned
by KeySpaceManager#getServiceList call  (was: Ozone: Service Discovery: Limit number of datanodes
(REST servers) returned by KeySpaceManager#getServiceList call)

> Ozone: Service Discovery: Limit the 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
>            Priority: Major
>
> 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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