question Re: nameNode HA not working in Archives of Support Questions (Read Only)

nameNode HA not working

aliyesami — Mon, 19 Aug 2019 09:15:28 GMT

I am using ambari to enable the namenode HA but its not detecting the checkpoint and not advancing the screen . please see below

Re: nameNode HA not working

jaimin — Wed, 18 Jan 2017 06:56:28 GMT

@Sami Ahmad

ambari-web uses below pointed code to determine enabling of next button:

https://github.com/apache/ambari/blob/release-2.4.0/ambari-web/app/controllers/main/admin/highAvailability/nameNode/step4_controller.js#L45-L55

Following API call will help to debug further the reason behind this issue:

http://c6401.ambari.apache.org:8080/api/v1/clusters/c1/hosts/{NAMENODE_HOSTNAME}/host_components/NAMENODE?fields=metrics/dfs/namenode/Safemode,metrics/dfs/namenode/JournalTransactionInfo

Value of Safemode and JournalTransactionInfo should not be empty.

value of LastAppliedOrWrittenTxId - value of MostRecentCheckpointTxId should be less than or equal to 1

Re: nameNode HA not working

KuldeepK — Wed, 18 Jan 2017 18:10:45 GMT

@Sami Ahmad

Please save ambari-server and ambari-agent logs on the journal node machines for further reference.

One h@cky approach could be -

1. Copy the link from browser's address bar where enable Namenode HA wizard is stuck.

2. Open new tab in the same browser.

3. Paste the copied link.

4. increase the step number manually, i.e. if step4 is the last value in the copied url then make it as step5

5. press enter and move on!

Please don't forget to create a Hortonworks Support ticket if you have a support subscription, it will help us to identify a BUG and fix it to avoid further occurrences of this issue.

Hope this helps!

-Kuldeep

Re: nameNode HA not working

aliyesami — Sat, 28 Jan 2017 00:31:31 GMT

awesome approach . .the work around worked.

thanks a lot