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https://issues.apache.org/jira/browse/HADOOP-16231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16822222#comment-16822222
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Siyao Meng commented on HADOOP-16231:
-------------------------------------
I can understand that the purpose of loglevel change is to not freak the user
out. But could there be some cases where user should actually be warned? A
random search gave me this:
{code}
17/03/06 12:33:31 WARN kms.LoadBalancingKMSClientProvider: KMS provider at
[https://<kms_host>:9393/kms/v1/] threw an IOException!! java.io.IOException:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException:
No trusted certificate found
at
org.apache.hadoop.crypto.key.kms.KMSClientProvider.addDelegationTokens(KMSClientProvider.java:1029)
...
{code}
[Source|https://community.hortonworks.com/questions/87095/service-checks-fails-for-yarnpighivemr-after-enabl.html]
Looks like this warning is legit.
> Reduce KMS error logging severity from WARN to INFO
> ---------------------------------------------------
>
> Key: HADOOP-16231
> URL: https://issues.apache.org/jira/browse/HADOOP-16231
> Project: Hadoop Common
> Issue Type: Improvement
> Components: kms
> Affects Versions: 3.2.0
> Reporter: Kitti Nanasi
> Assignee: Kitti Nanasi
> Priority: Trivial
> Attachments: HDFS-14404.001.patch
>
>
> When the KMS is deployed as an HA service and a failure occurs the current
> error severity in the client code appears to be WARN. It can result in
> excessive errors despite the fact that another instance may succeed.
> Maybe this log level can be adjusted in only the load balancing provider.
> {code}
> 19/02/27 05:10:10 WARN kms.LoadBalancingKMSClientProvider: KMS provider at
> [https://example.com:16000/kms/v1/] threw an IOException
> [java.net.ConnectException: Connection refused (Connection refused)]!!
> 19/02/12 20:50:09 WARN kms.LoadBalancingKMSClientProvider: KMS provider at
> [https://example.com:16000/kms/v1/] threw an IOException:
> java.io.IOException: java.lang.reflect.UndeclaredThrowableException
> {code}
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