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
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" wrote:
I want
