[lttng-dev] LTTng Tools 2.1 streaming commands

[David Goulet]

After talking a bit about this issue with other LTTng devs, it turns out
that it makes more sense to have a "set-consumer" command and remove
enable/disable-consumer from the cmd UI.

I'll send a proposal on lttng-dev in the next days and please, everyone,
feel free to give feedbacks on this.

Thanks!
David

Bernd Hufmann:
> Hello
>  
> For the support of LTTng Tools 2.1 in Eclipse, I'm currently trying to
> understand how to use the configuration for network streaming with the
> updated "lttng create"-command and new "enable-consumer"-command.
>  
> a) lttng enable-consumer
> I find this command confusing because this command does not always
> enables the consumer, even if the command name implies so. The enabling
> actually depends on how the command is executed.
> Examples:
> 
>   * "lttng enable-consumer -k -U net://<remote_addr>" or "lttng
>     enable-consumer -k -C tcp://<remote_addr> -D tcp://<remote_addr>"
>     don't enable the consumer. You need to either add option --enable or
>     execute subsequently "lttng enable-consumer --enable"
>   * lttng enable-consumer -k net://<remote_addr> does enable the
>     consumer. I took me a while to figure out the difference to the
>     example above: The option -U is omitted.
> 
>  
> What the command actually provides, is 2 features: A way to configure
> streaming (e.g. remote_addr) and a way to enable the consumer. Would it
> be better to name it to "lttng configure-consumer"? Also, remove the
> support of the possibility to not specify -U, -C or -D. The following
> variants of this command should be enough:
> lttng configure-consumer -k -U <remote_addr> [--enable]
> lttng configure-consumer -k -C <remote_addr> -D <remote_addr> [--enable]
> lttng configure-consumer -k --enable
> lttng configure-consumer -u -U <remote_addr> [--enable]
> lttng configure-consumer -u -C <remote_addr> -D <remote_addr> [--enable]
> lttng configure-consumer -u --enable
>  
> Please let me know what you think.
>  
> b) lttng create [-U <remote_addr>] | [-C <remote_addr> -D <remote_addr>]
> [--no-consumer] [--disable-consumer]
> 
>   * Are options --no-consumer or --disable-consumer only applicable for
>     streaming?
>   * I'm not sure what is the purpose of the options --no-consumer or
>     --disable-consumer. Could you please explain the use cases for using
>     --no-consumer or --disable-consumer? 
> 
>  
> Thanks
> Bernd
>  
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