HA is not working in case of 2 Datanode and 1 HRegion failure.

[#1]

I tried to do HA test of HDFS as shutting down 2 datanode(among 3) and 1 region server(among 3). After shutting down, I could not access and write data at all using remaining 1 datanode and 2 Hregion. I like to know whether it is general work or I missed something. Please find the attached about system diagram.

[#2]

@SH Kim

Did you try to do a graceful shutdown of region servers and Datanodes decommissioning? as you are using very less number of nodes, always it better to have more than 50% availability.

[#3 · Accepted solution]

Thank you @Sridhar,

I did shut down using Ambari, so I think I did graceful shutdown. I think three is minimum for datanode and I like to make sure it is working alone.