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https://issues.apache.org/jira/browse/HDFS-7135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14145103#comment-14145103
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Colin Patrick McCabe commented on HDFS-7135:
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bq. This is effectively a dupe of HDFS-6956.
HDFS-6956 is about servers, this is about clients. It's not possible to do an
RPC to clients to change their tracing configuration because clients normally
don't expose a port and a listening service to the world. Plus clients are
often short-lived, so by the time you could even do an RPC, the client might
have exited.
bq. Adding manual tracing command which can be used like 'hdfs dfs -trace -ls
/'.
I sort of appreciate the simplicity of this interface, but I'm not sure how I
feel about this patch. It seems more consistent to configure client-side
tracing by setting a configuration key. I suppose the \-trace command added
here can simply override that configuration, though.
> Add trace command to FsShell
> ----------------------------
>
> Key: HDFS-7135
> URL: https://issues.apache.org/jira/browse/HDFS-7135
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: Masatake Iwasaki
> Assignee: Masatake Iwasaki
> Attachments: HDFS-7135-0.patch, HDFS-7135-1.patch
>
>
> Adding manual tracing command which can be used like 'hdfs dfs -trace -ls /'.
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