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https://issues.apache.org/jira/browse/HADOOP-12447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14934864#comment-14934864
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Colin Patrick McCabe commented on HADOOP-12447:
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{{hadoop-common-project/hadoop-common/src/site/markdown/Tracing.md}}: update
the documentation to remove references to the obsolete {{dfs.htrace}}
configuration keys and the deprecated no-argument {{Tracer#Builder}}
constructor. Update the configuration keys described here to be their modern
equivalents.
{{HdfsClientConfigKeys.java}}, {{DFSConfigKeys.java}}, {{hdfs-default.xml}}:
remove references to the unused obsolete configuration key
{{dfs.client.htrace.sampler.classes}}
{{NameNodeRpcServer.java}}: we should set the Tracer for the
{{serviceRpcServer}} (the RPC server which DNs talk to) as well as the for
{{clientRpcServer}}. Due to a typo, only one of them was getting set.
{{NamenodeFsck.java}}: we should construct a {{Tracer}} using the configuration
prefix {{namenode.fsck.htrace}} so that tracing can be enabled specifically for
fsck.
{{TestBlockTokenWithDFS.java}}, {{TestDataNodeVolumeFailure.java}}: set the
Tracer object when constructing a {{BlockReader}}. It isn't strictly
necessary, but it is awkward to have {{tracer}} be a null pointer, and it will
be helpful if these tests need to be extended in the future. (Note: may need
to be done on JspHelper in older branches)
> Clean up some htrace integration issues
> ---------------------------------------
>
> Key: HADOOP-12447
> URL: https://issues.apache.org/jira/browse/HADOOP-12447
> Project: Hadoop Common
> Issue Type: Bug
> Components: tracing
> Affects Versions: 2.8.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
>
> Clean up some htrace integration issues
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