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https://issues.apache.org/jira/browse/HDFS-12658?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16203796#comment-16203796
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Daryn Sharp commented on HDFS-12658:
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The logic should be smarter. A simple improvement may be something
hdfsTimeout/2-1000 to allow the client 1s to issue the renewal. That should
prevent flapping in the majority of cases.
> Lease renewal causes connection flapping
> ----------------------------------------
>
> Key: HDFS-12658
> URL: https://issues.apache.org/jira/browse/HDFS-12658
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.0.0-alpha
> Reporter: Daryn Sharp
>
> Adding a dfsclient to the lease renewer use the minimum of 1/2 the soft
> timeout vs. 1/2 the client's timeout (when the client closes an idle
> connection). Both default to 1m, so clients with open files that are
> otherwise not making calls to the NN will experience connection flapping.
> Re-authentication is unnecessarily taxing on the ipc layer.
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