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https://issues.apache.org/jira/browse/HDFS-7675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14292308#comment-14292308
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Colin Patrick McCabe commented on HDFS-7675:
--------------------------------------------
It's not redundant. Calling {{SpanReceiverHost#getInstance}} initializes
{{SpanReceiverHost#SingletonHolder#INSTANCE}}, which is needed for tracing to
operate. This code was taken from HBase, which has a similar construct for
tracing.
I agree that we could probably skip storing the {{SpanReceiverHost}} inside
{{DFSClient}}, as long as there was a comment about why we were calling
{{getInstance}}.
> Unused member DFSClient.spanReceiverHost
> ----------------------------------------
>
> Key: HDFS-7675
> URL: https://issues.apache.org/jira/browse/HDFS-7675
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: dfsclient
> Affects Versions: 3.0.0
> Reporter: Konstantin Shvachko
>
> DFSClient.spanReceiverHost is initialised but never used. Could be redundant.
> This was introduced by HDFS-7055.
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