I read the QJM in hadoop official documentation but there is no clear control flow explanation
So far I understand was
When the namenode fails zookeeper failure controller will detect and change the standby namenode as active namenode.
Only active namenode will write the edit log in Journal node
- Journal will sync the edit log with standby namenode
Can any one please explain how the real flow works?
- step 1: when client connects request goes here ....
- step 2: it will take care of these request ....
- step 3: if it fails it will happen the request will go there....
Like that can anyone please explain the complete flow of QJM
Thanks in advance
What will happen is edit log on Journal node becomes large?
Will standby namenode send new FSimage to active namenode?
How client finds the active namenode?