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Posted to common-issues@hadoop.apache.org by "Bryan Beaudreault (Jira)" <ji...@apache.org> on 2021/08/06 16:20:00 UTC
[jira] [Reopened] (HADOOP-17837) Make it easier to debug
UnknownHostExceptions from NetUtils.connect
[ https://issues.apache.org/jira/browse/HADOOP-17837?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bryan Beaudreault reopened HADOOP-17837:
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> Make it easier to debug UnknownHostExceptions from NetUtils.connect
> -------------------------------------------------------------------
>
> Key: HADOOP-17837
> URL: https://issues.apache.org/jira/browse/HADOOP-17837
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Bryan Beaudreault
> Assignee: Bryan Beaudreault
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.4.0, 3.3.2
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Most UnknownHostExceptions thrown throughout hadoop include a useful message, either the hostname that was not found or some other descriptor of the problem. The UnknownHostException thrown from NetUtils.connect only includes the [message of the underlying UnresolvedAddressException|https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/net/NetUtils.java#L592]. If you take a look at the source for UnresolvedAddressException, [it only has a no-args constructor|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/channels/UnresolvedAddressException.html] (java11, but same is true in other versions). So it never has a message, meaning the UnknownHostException message is empty.
> We should include the endpoint.toString() in the UnknownHostException thrown by NetUtils.connect
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