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https://issues.apache.org/jira/browse/HDFS-4870?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Patrick McCabe updated HDFS-4870:
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Attachment: HDFS-4870.001.patch
> periodically re-resolve hostnames in included and excluded datanodes list
> -------------------------------------------------------------------------
>
> Key: HDFS-4870
> URL: https://issues.apache.org/jira/browse/HDFS-4870
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Colin Patrick McCabe
> Priority: Minor
> Attachments: HDFS-4870.001.patch
>
>
> We currently only resolve the hostnames in the included and excluded
> datanodes list once-- when the list is read. The rationale for this is that
> in big clusters, DNS resolution for thousands of nodes can take a long time
> (when generating a datanode list in getDatanodeListForReport, for example).
> However, if the DNS information changes for one of these hosts, we should
> reflect that. A background thread could do these DNS resolutions every few
> minutes without blocking any foreground operations.
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