Jing Zhao created HDFS-5384:
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Summary: Add a new TransitionState to indicate NN is in transition
from standby state to active state
Key: HDFS-5384
URL: https://issues.apache.org/jira/browse/HDFS-5384
Project: Hadoop HDFS
Issue Type: Improvement
Components: ha, namenode
Affects Versions: 3.0.0
Reporter: Jing Zhao
Assignee: Jing Zhao
Currently in HA setup, when a NameNode is transitioning from standby to active,
the current code first sets the state of the NN to Active, then starts the
active service, during which the NN still needs to tail the remaining editlog
and may not be able to serve certain requests as expected (such as HDFS-5322).
So it may be necessary to define a transition state to indicate that NN has
left the previous state and is in transitioning to the next state.
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