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https://issues.apache.org/jira/browse/HDFS-6880?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14128867#comment-14128867
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Masatake Iwasaki commented on HDFS-6880:
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bq. So, it looks like we don't have tracing inside DFSInputStream here. Are you 
planning on adding that in a later JIRA, or should we do it in this one?

Because DFSInputStream does not use Thread in normal path as DFSOutputStream 
do, it is not crucial to add the code (for passing tracing infos between 
threads) in it. But it might be better if the code is symmetric for input and 
output. I will consider to add tracing span to DFSInputStream on updating the 
patch. 

> Adding tracing to DataNode data transfer protocol
> -------------------------------------------------
>
>                 Key: HDFS-6880
>                 URL: https://issues.apache.org/jira/browse/HDFS-6880
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Masatake Iwasaki
>            Assignee: Masatake Iwasaki
>         Attachments: HDFS-6880-0.patch
>
>




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