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https://issues.apache.org/jira/browse/HDFS-8053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14905203#comment-14905203
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Mingliang Liu commented on HDFS-8053:
-------------------------------------
In the {{DFSClient$Renewer}}, there is a code piece like:
{code}
static {
//Ensure that HDFS Configuration files are loaded before trying to use
// the renewer.
HdfsConfiguration.init();
}
{code}
Its purpose was elaborated in [HDFS-3012]. Specifically, there may be an
exception while renewing delegation token, because:
{quote}
...the RM has no direct reference to HDFS at all. The DFSClient.Renewer is
loaded using a ServiceLoader and there is no reference to HdfsConfiguration
from DFSClient.Renewer.
{quote}
This code section was deleted in the v0 patch (commented as _TODO_). The reason
was that the {{HdfsConfiguration}} is in {{hadoop-hdfs}} module and it should
be. I had a look at the code and I think we may still need to keep this code as
it-is.
A possbile solution is to move the {{DFSClient$Renewer}} class out of the
{{DFSClient}} class and put it in the {{hadoop-hdfs}} module.
> Move DFSIn/OutputStream and related classes to hadoop-hdfs-client
> -----------------------------------------------------------------
>
> Key: HDFS-8053
> URL: https://issues.apache.org/jira/browse/HDFS-8053
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: build
> Reporter: Haohui Mai
> Assignee: Mingliang Liu
> Attachments: HDFS-8053.000.patch
>
>
> This jira tracks the effort of moving the {{DFSInputStream}} and
> {{DFSOutputSream}} classes from {{hadoop-hdfs}} to {{hadoop-hdfs-client}}
> module.
> Guidelines:
> * As the {{DFSClient}} is heavily coupled to these two classes, we should
> move it together.
> * Related classes should be addressed in separate jiras if they're
> independent and complex enough.
> * The checkstyle warnings can be addressed in [HDFS-8979 |
> https://issues.apache.org/jira/browse/HDFS-8979]
> * Removing the _slf4j_ logger guards when calling {{LOG.debug()}} and
> {{LOG.trace()}} can be addressed in [HDFS-8971 |
> https://issues.apache.org/jira/browse/HDFS-8971].
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