Simbarashe Dzinamarira created HDFS-16890:
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Summary: Add period state refresh to keep router state near active
namenode's
Key: HDFS-16890
URL: https://issues.apache.org/jira/browse/HDFS-16890
Project: Hadoop HDFS
Issue Type: Task
Reporter: Simbarashe Dzinamarira
When using the ObserverReadProxyProvider, clients can setÂ
*dfs.client.failover.observer.auto-msync-period...* to periodically get the
Active namenode's state. When using routers without the
ObserverReadProxyProvider, this periodic update is lost.
In a busy cluster, the Router constantly gets updated with the active
namenode's state when
# There is a write operation.
# There is an operation (read/write) from a new clients.
However, in the scenario when there are no new clients and no write operations,
the state kept in the router can lag behind the active's. The router does
update its state with responses from the Observer, but the observer may be
lagging behind too.
We should have a periodic refresh in the router to serve a similar role as
*dfs.client.failover.observer.auto-msync-period*
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