If you want to do failover of NameNode (or even kill NameNode process)
doing shell operation (like ./hdfs haadmin -getServiceState nn) is
mandatory from program.

For DataNode there is one function in DFSClient#datanodeReport which
provides list of LIVE Datanode.

To avoid shell operations of hdfs haadmin, i was looking for some function
which can provide Name of Active NameNode.

Is there anything implemented in Hadoop which provide Active NameNode?

On Fri, Oct 20, 2017 at 4:25 AM, Arpit Agarwal <aagar...@hortonworks.com>
wrote:

> Mihir,
>
> HAAdmin is a private interface. Most of its functionality is exposed via
> the ‘hdfs haadmin’ command [1]. Will that work for you?
>
> 1. https://hadoop.apache.org/docs/r2.7.0/hadoop-project-
> dist/hadoop-hdfs/HDFSCommands.html#haadmin
>
>
>
>
> On 10/17/17, 4:28 AM, "Mihir Monani" <mmon...@salesforce.com> wrote:
>
>     I wanted to write Chaos Action for HBase Chaos Monkey (something like
>     RestartActiveMaster
>     <https://github.com/apache/hbase/blob/master/hbase-it/
> src/test/java/org/apache/hadoop/hbase/chaos/actions/
> RestartActiveMasterAction.java>
>      )  which can trigger NN Failover.
>
>     For that i was going through HAAdmin.java. Is there any way I can use
>     function like HAAdmin#failover , HAAdmin#getServiceState from HAAdmin
>     class.
>
>     Can someone guide me how do i use them?
>
>     Thanks,
>     Mihir Monani
>
>
>

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