Eric Payne created HDFS-14758:
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Summary: 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
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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