hemanthboyina updated HDFS-14758:
    Attachment: HDFS-14758.002.patch

> Decrease lease hard limit
> -------------------------
>                 Key: HDFS-14758
>                 URL: https://issues.apache.org/jira/browse/HDFS-14758
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Eric Payne
>            Assignee: hemanthboyina
>            Priority: Minor
>         Attachments: HDFS-14758.001.patch, HDFS-14758.002.patch
> The hard limit is currently hard-coded to be 1 hour. This also determines the 
> NN automatic lease recovery interval. Something like 20 min will make more 
> sense.
> After the 5 min soft limit, other clients can recover the lease. If no one 
> else takes the lease away, the original client still can renew the lease 
> within the hard limit. So even after a NN full GC of 8 minutes, leases can be 
> still valid.
> However, there is one risk in reducing the hard limit. E.g. Reduced to 20 
> min. If the NN crashes and the manual failover takes more than 20 minutes, 
> clients will abort.

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