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From "hemanthboyina (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-14758) Decrease lease hard limit
Date Fri, 06 Sep 2019 12:56:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-14758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16924226#comment-16924226

hemanthboyina commented on HDFS-14758:

attached patch , pls review [~kihwal] [~jojochuang]

> 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
> 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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