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https://issues.apache.org/jira/browse/HDDS-12809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-12809:
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Labels: pull-request-available (was: )
> Avoid reverse DNS lookup in check ACL
> -------------------------------------
>
> Key: HDDS-12809
> URL: https://issues.apache.org/jira/browse/HDDS-12809
> Project: Apache Ozone
> Issue Type: Improvement
> Reporter: Janus Chow
> Priority: Major
> Labels: pull-request-available
>
> We noticed a 14ms delay in OM's check ACL operation.
> The cause is the reverse DNS lookup for the client's hostName, it's operated
> by local server's DNS lookup method, when the hostname is not found, there
> will be a 14ms delay, and during the negative cache, the delay is gone, but
> after the negative cache expires, the 14ms delay appears again.
> IMO, the server side can not always have the client's hostname, and it's ok
> to return the IP directly in checkACL, and since we do have the
> "InetAddress", we can invoke getHostName() when needed, and we don't need to
> invoke getHostName() on every client call.
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