question Re: Can you add a ha namenode without cluster downtime? in Archives of Support Questions (Read Only)

Can you add a ha namenode without cluster downtime?

SRoy — Thu, 04 Feb 2016 03:21:33 GMT

Currently we have no HA on the name node in a HDP 2.2 cluster in production.

We are trying to determine if we can add a new node and enable it has a standby namenode.

Our objective is to enable namenode HA on the hortonworks cluster without taking the cluster offline.

Re: Can you add a ha namenode without cluster downtime?

nsabharwal — Thu, 04 Feb 2016 03:22:39 GMT

@S Roy

No as we have to run checkpoint on the NN and save the namespace. You have to have downtime to enable HA

Re: Can you add a ha namenode without cluster downtime?

nsabharwal — Thu, 04 Feb 2016 03:24:22 GMT

@S Roy very details doc with screen shots http://docs.hortonworks.com/HDPDocuments/Ambari-2.2.0.0/bk_Ambari_Users_Guide/content/_how_to_configure_namenode_high_availability.html

Re: Can you add a ha namenode without cluster downtime?

SRoy — Thu, 04 Feb 2016 03:48:20 GMT

We have a process which pulls messages from MQ and puts it in HBase. Since the messages have a 10 sec expiry we cannot afford to have the cluster down. What do people do in such situations?

Re: Can you add a ha namenode without cluster downtime?

nsabharwal — Thu, 04 Feb 2016 04:16:44 GMT

@S Roy Please post it as new question 🙂 I will try to answer

Re: Can you add a ha namenode without cluster downtime?

nsabharwal — Thu, 04 Feb 2016 04:16:54 GMT

otherwise see this http://hortonworks.com/blog/apache-hbase-high-availability-next-level/