Bryan Beaudreault created HADOOP-17837:
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Summary: 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
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 underlyingÂ
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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