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https://issues.apache.org/jira/browse/HDFS-8213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14505797#comment-14505797
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Colin Patrick McCabe commented on HDFS-8213:
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Hi Billie,
{{DFSClient}} needs to instantiate {{SpanReceiverHost}} in order to implement
tracing, in the case where the process using the {{DFSClient}} doesn't
configure its own span receivers.
If you are concerned about multiple span receivers being instantiated, simply
set {{hadoop.htrace.span.receiver.classes}} to the empty string, and Hadoop
won't instantiate any span receivers. That should be its default anyway.
> DFSClient should not instantiate SpanReceiverHost
> -------------------------------------------------
>
> Key: HDFS-8213
> URL: https://issues.apache.org/jira/browse/HDFS-8213
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.0
> Reporter: Billie Rinaldi
> Priority: Critical
>
> DFSClient initializing SpanReceivers is a problem for Accumulo, which manages
> SpanReceivers through its own configuration. This results in the same
> receivers being registered multiple times and spans being delivered more than
> once. The documentation says SpanReceiverHost.getInstance should be issued
> once per process, so there is no expectation that DFSClient should do this.
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