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Posted to common-issues@hadoop.apache.org by "Vinod Kumar Vavilapalli (JIRA)" <ji...@apache.org> on 2016/08/18 01:05:21 UTC

[jira] [Updated] (HADOOP-12125) Retrying UnknownHostException on a proxy does not actually retry hostname resolution

     [ https://issues.apache.org/jira/browse/HADOOP-12125?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinod Kumar Vavilapalli updated HADOOP-12125:
---------------------------------------------
    Target Version/s: 2.7.4  (was: 2.7.3)

2.7.3 is under release process, changing target-version to 2.7.4.

> Retrying UnknownHostException on a proxy does not actually retry hostname resolution
> ------------------------------------------------------------------------------------
>
>                 Key: HADOOP-12125
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12125
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ipc
>            Reporter: Jason Lowe
>            Assignee: Rushabh S Shah
>
> When RetryInvocationHandler attempts to retry an UnknownHostException the hostname fails to be resolved again.  The InetSocketAddress in the ConnectionId has cached the fact that the hostname is unresolvable, and when the proxy tries to setup a new Connection object with that ConnectionId it checks if the (cached) resolution result is unresolved and immediately throws.
> The end result is we sleep and retry for no benefit.  The hostname resolution is never attempted again.



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