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Registered: ‎03-10-2017

How the Name node identifies the MR jobs in yarn if Active NN fails and passive NN became active.

In Name node HA scenario ,  if Active Namenode fails and passive Namenode became active, duuring this time how the MR jobs will function.

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Registered: ‎09-02-2016

Re: How the Name node identifies the MR jobs in yarn if Active NN fails and passive NN became active

@ClouderaKnow

 

It is possible with the help of Journal Node.

 

"In order for the Standby node to keep its state synchronized with the Active node, both nodes communicate with a group of separate daemons called "JournalNodes" (JNs)."

 

You can refer this link for more details:

https://hadoop.apache.org/docs/r2.4.1/hadoop-project-dist/hadoop-hdfs/HDFSHighAvailabilityWithQJM.ht...

 

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Posts: 313
Registered: ‎07-01-2015

Re: How the Name node identifies the MR jobs in yarn if Active NN fails and passive NN became active

Your job will contitnue to run. Even if you restart the whole YARN
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