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https://issues.apache.org/jira/browse/YARN-6358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Carlo Curino reassigned YARN-6358:
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Assignee: Jose Miguel Arreola
> Cache the resolved hosts prevent calls to InetAddress.getByName and
> normalizeHost
> ---------------------------------------------------------------------------------
>
> Key: YARN-6358
> URL: https://issues.apache.org/jira/browse/YARN-6358
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: resourcemanager, security
> Reporter: Jose Miguel Arreola
> Assignee: Jose Miguel Arreola
> Labels: performance
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> When running performance tests, we noticed that a lot of time is taken in
> resolving the host address.
> In our specific scenario, we saw the function
> org.apache.hadoop.security.SecurityUtil.getInetAddressByName taking a lot of
> time to resolve the hosts, and the same function is called a lot of times.
> I saw that org.apache.hadoop.yarn.server.resourcemanager.NodesListManager has
> a cached resolver already because of the same reason.
> So, the proposal is, to make this cache generic and use it to save some time
> in this functions that we already know, but have it available so the cache
> can be used anywhere else.
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