[lttng-dev] LTTng Tools 2.1 streaming commands

Matthew Khouzam matthew.khouzam at ericsson.com
Tue Oct 9 17:18:30 EDT 2012

I actually like this suggestion, it is less ambiguous...
the last thing we want is for an enable-xyz to disable-xyz... Unless we
want to frustrate the users.


On 12-10-09 03:08 PM, David Goulet wrote:
> 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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