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

[ClouderaKnow]

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

[saranvisa Champion]

@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...