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https://issues.apache.org/jira/browse/HADOOP-17052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mingliang Liu resolved HADOOP-17052.
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Fix Version/s: 3.4.0
3.3.1
2.10.1
3.2.2
3.1.4
2.9.3
Hadoop Flags: Reviewed
Resolution: Fixed
Committed to all fixed versions branches. Thanks [~dhegde] for the reporting
and providing a fix; thanks [~hemanthboyina] for review.
> NetUtils.connect() throws unchecked exception (UnresolvedAddressException)
> causing clients to abort
> ---------------------------------------------------------------------------------------------------
>
> Key: HADOOP-17052
> URL: https://issues.apache.org/jira/browse/HADOOP-17052
> Project: Hadoop Common
> Issue Type: Bug
> Components: hdfs-client
> Affects Versions: 2.10.0, 2.9.2, 3.2.1, 3.1.3
> Reporter: Dhiraj Hegde
> Assignee: Dhiraj Hegde
> Priority: Major
> Fix For: 2.9.3, 3.1.4, 3.2.2, 2.10.1, 3.3.1, 3.4.0
>
> Attachments: read_failure.log, write_failure1.log, write_failure2.log
>
>
> Hadoop components are increasingly being deployed on VMs and containers. One
> aspect of this environment is that DNS is dynamic. Hostname records get
> modified (or deleted/recreated) as a container in Kubernetes (or even VM) is
> being created/recreated. In such dynamic environments, the initial DNS
> resolution request might return resolution failure briefly as DNS client
> doesn't always get the latest records. This has been observed in Kubernetes
> in particular. In such cases NetUtils.connect() appears to throw
> java.nio.channels.UnresolvedAddressException. In much of Hadoop code (like
> DFSInputStream and DFSOutputStream), the code is designed to retry
> IOException. However, since UnresolvedAddressException is not child of
> IOException, no retry happens and the code aborts immediately. It is much
> better if NetUtils.connect() throws java.net.UnknownHostException as that is
> derived from IOException and the code will treat this as a retry-able error.
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