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https://issues.apache.org/jira/browse/HADOOP-14193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15929106#comment-15929106
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Arpit Agarwal commented on HADOOP-14193:
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[~jmArreola], just curious why you resolved this as Invalid. Thanks.
> Cache the resolved hosts to prevent calls to InetAddress.getByName and
> normalizeHost
> ------------------------------------------------------------------------------------
>
> Key: HADOOP-14193
> URL: https://issues.apache.org/jira/browse/HADOOP-14193
> Project: Hadoop Common
> Issue Type: Improvement
> Components: common
> Reporter: Jose Miguel Arreola
> 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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