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https://issues.apache.org/jira/browse/MAPREDUCE-4148?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13265927#comment-13265927
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Robert Joseph Evans commented on MAPREDUCE-4148:
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I agree with Daryn on this. I don't really like using the static block to
register things. We have had issues in the past in the RM where renewing
delegation tokens did not work because the HDFS configuration files were not
loaded in a static block because there was no reference to the class with the
static block in the code being run. It was a beast to debug too.
I would prefer to see something that uses a ServiceLoader, or like Daryn said
something from the secret manager could ensure that those static blocks are
called for all of them that it cares about, but I think the service loader is
the direction that a lot of the code has been going in.
> MapReduce should not have a compile-time dependency on HDFS
> -----------------------------------------------------------
>
> Key: MAPREDUCE-4148
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4148
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Tom White
> Assignee: Tom White
> Attachments: MAPREDUCE-4148.patch, MAPREDUCE-4148.patch
>
>
> MapReduce depends on HDFS's DelegationTokenIdentifier (for printing token
> debug information). We should remove this dependency and MapReduce's
> compile-time dependency on HDFS.
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