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From "Billie Rinaldi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8213) DFSClient should not instantiate SpanReceiverHost
Date Tue, 21 Apr 2015 21:48:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14505847#comment-14505847
] 

Billie Rinaldi commented on HDFS-8213:
--------------------------------------

As documented, each process must configure its own span receivers if it wants to use tracing.
 If I set hadoop.htrace.span.receiver.classes to the empty string, then the NameNode and DataNode
will not do any tracing.

> 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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