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https://issues.apache.org/jira/browse/HADOOP-15808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16638112#comment-16638112
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Steve Loughran commented on HADOOP-15808:
-----------------------------------------

checkstyle
{code}
./hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/token/Token.java:21:import
 com.google.common.base.Preconditions;:8: Unused import - 
com.google.common.base.Preconditions. [UnusedImports]
{code}

> Harden Token service loader use
> -------------------------------
>
>                 Key: HADOOP-15808
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15808
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: security
>    Affects Versions: 2.9.1, 3.1.2
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>         Attachments: HADOOP-15808-001.patch, HADOOP-15808-002.patch
>
>
> The Hadoop token service loading (identifiers, renewers...) works provided 
> there's no problems loading any registered implementation. If there's a 
> classloading or classcasting problem, the exception raised will stop all 
> token support working; possibly the application not starting.
> This matters for S3A/HADOOP-14556 as things may not load if aws-sdk isn't on 
> the classpath. It probably lurks in the wasb/abfs support too, but things 
> have worked there because the installations with DT support there have always 
> had correctly set up classpaths.
> Fix: do what we did for the FS service loader. Catch failures to instantiate 
> a service provider impl and skip it



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