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https://issues.apache.org/jira/browse/HDFS-6956?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14118963#comment-14118963
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Colin Patrick McCabe commented on HDFS-6956:
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daemonlog is about log4j, this is about tracing. htrace can send trace events
to a system like zipkin, which is more useful than just catting them to a file
or to log4j.
I imagine the implementation might be kind of like daemonlog, though. A
command that you could run to enable tracing while in production.
> 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
>
> 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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