Mohammad Arshad updated HDFS-13443:
    Labels: RBF  (was: )

> Update mount table cache immediately after changing (add/update/remove) mount 
> table entries.
> --------------------------------------------------------------------------------------------
>                 Key: HDFS-13443
>                 URL: https://issues.apache.org/jira/browse/HDFS-13443
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: fs
>            Reporter: Mohammad Arshad
>            Priority: Major
>              Labels: RBF
> Currently mount table cache is updated periodically, by default cache is 
> updated every minute. After change in mount table, user operations may still 
> use old mount table. This is bit wrong.
> To update mount table cache, maybe we can do following
>  * *Add refresh API in MountTableManager which will update mount table cache.*
>  * *When there is a change in mount table entries, router admin server can 
> update its cache and ask other routers to update their cache*. For example if 
> there are three routers R1,R2,R3 in a cluster then add mount table entry API, 
> at admin server side, will perform following sequence of action
>  ## user submit add mount table entry request on R1
>  ## R1 adds the mount table entry in state store
>  ## R1 call refresh API on R2
>  ## R1 calls refresh API on R3
>  ## R1 directly freshest its cache
>  ## Add mount table entry response send back to user.

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