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Posted to hdfs-dev@hadoop.apache.org by Mihir Monani <mm...@salesforce.com> on 2017/10/17 11:28:44 UTC
Use HAAdmin API
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
Re: Use HAAdmin API
Posted by Mihir Monani <mm...@salesforce.com>.
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 <aa...@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" <mm...@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
>
>
>
Re: Use HAAdmin API
Posted by Arpit Agarwal <aa...@hortonworks.com>.
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" <mm...@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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