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From "hemanthboyina (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14758) Decrease lease hard limit
Date Wed, 04 Sep 2019 15:00:09 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16922584#comment-16922584
] 

hemanthboyina commented on HDFS-14758:
--------------------------------------

renew lease in client is using Lease Hard Limit
{code:java}
 if (elapsed > HdfsConstants.LEASE_HARDLIMIT_PERIOD) {
    {code}
so we can expose the configured hard limit to client ?

> 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
>
> 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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