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https://issues.apache.org/jira/browse/HDFS-6956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14149667#comment-14149667
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stack commented on HDFS-6956:
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bq. ...I think the most usual configuration to trace HBase + HDFS would be to
configure HDFS to use....
bq. ...It seems simpler to set those up separately in case a span receiver
already exists on HDFS....
Makes sense. Can revisit if praxis dictates this postulated facility is
actually necessary.
Took a look at the patch. LGTM. +1.
> Allow dynamically changing the tracing level in Hadoop servers
> --------------------------------------------------------------
>
> Key: HDFS-6956
> URL: https://issues.apache.org/jira/browse/HDFS-6956
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, namenode
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-6956.002.patch, HDFS-6956.003.patch,
> HDFS-6956.004.patch, HDFS-6956.005.patch
>
>
> We should allow users to dynamically change the tracing level in Hadoop
> servers. The easiest way to do this is probably to have an RPC accessible
> only to the superuser that changes tracing settings. This would allow us to
> turn on and off tracing on the NameNode, DataNode, etc. at runtime.
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