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https://issues.apache.org/jira/browse/HADOOP-17052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17121215#comment-17121215
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Hudson commented on HADOOP-17052:
---------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #18312 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/18312/])
HADOOP-17052. NetUtils.connect() throws unchecked exception (github: rev
9fe4c37c25b256d31202854066eb7e15c6335b9f)
* (edit)
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetUtils.java
* (edit)
hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/net/TestNetUtils.java
> 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
> 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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