[
https://issues.apache.org/jira/browse/HDFS-14758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16915244#comment-16915244
]
hemanthboyina commented on HDFS-14758:
--------------------------------------
yes [~zhangchen] even decreasing hard limit doesn't solve in all the scenarios
,
as [~jojochuang] mentioned _there can be network partitions or client may
simply crash (NN crash doesn't loose state). HDFS-14694 doesn't address all
failure scenarios._
so i feel better we have both which covers all the failure scenarios
> 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.
--
This message was sent by Atlassian Jira
(v8.3.2#803003)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
