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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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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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