https://community.cloudera.com/t5/Archives-of-Support-Questions/HA-is-not-working-in-case-of-2-Datanode-and-1-HRegion/m-p/201243#M78616 <P>Thank you @Sridhar,</P><P>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.</P> Wed, 23 May 2018 12:59:04 GMT picapitt 2018-05-23T12:59:04Z https://community.cloudera.com/t5/Archives-of-Support-Questions/HA-is-not-working-in-case-of-2-Datanode-and-1-HRegion/m-p/201241#M78614 <P>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.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="74529-screenshot277.jpg" style="width: 985px;"><img src="https://community.cloudera.com/t5/image/serverpage/image-id/17466iCD9D85B26833D7CE/image-size/medium?v=v2&amp;px=400" role="button" title="74529-screenshot277.jpg" alt="74529-screenshot277.jpg" /></span></P> Sun, 18 Aug 2019 05:34:19 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/HA-is-not-working-in-case-of-2-Datanode-and-1-HRegion/m-p/201241#M78614 picapitt 2019-08-18T05:34:19Z https://community.cloudera.com/t5/Archives-of-Support-Questions/HA-is-not-working-in-case-of-2-Datanode-and-1-HRegion/m-p/201242#M78615 <P><A href="https://community.hortonworks.com/questions/192318/ha-is-not-working-in-case-of-2-datanode-and-1-hreg.html#">@SH Kim</A></P><P>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. </P> Wed, 23 May 2018 12:43:58 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/HA-is-not-working-in-case-of-2-Datanode-and-1-HRegion/m-p/201242#M78615 bandarusridhar1 2018-05-23T12:43:58Z https://community.cloudera.com/t5/Archives-of-Support-Questions/HA-is-not-working-in-case-of-2-Datanode-and-1-HRegion/m-p/201243#M78616 <P>Thank you @Sridhar,</P><P>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.</P> Wed, 23 May 2018 12:59:04 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/HA-is-not-working-in-case-of-2-Datanode-and-1-HRegion/m-p/201243#M78616 picapitt 2018-05-23T12:59:04Z