From: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Date: Thu, 19 Sep 2019 20:56:53 +0000 (-0400)
Subject: relayd: Add backward compatibility for --group-output-by-session
X-Git-Tag: v2.12.0-rc1~249
X-Git-Url: http://git.liburcu.org/?a=commitdiff_plain;h=2a635488acf0c56ffb9b66c57f6bf97a95c53be6;hp=2a635488acf0c56ffb9b66c57f6bf97a95c53be6;p=lttng-tools.git

relayd: Add backward compatibility for --group-output-by-session

The current implementation works for producer (consumerd/lttng-sessiond)
using protocol version >= 2.11.

For producer using protocol version >= 2.4 and < 2.11, we can use the
session name passed on the RELAYD_CREATE_SESSION command to infer
information (creation datetime, base path) from the stream path passed on
the RELAYD_ADD_STREAM command. That information is then used to craft a
stream path, in a best effort manner, that comply with the
--group-output-by-session requirements:

  <session_name>/<hostname>-<datetime>/trace

Prior to protocol version 2.4, the session name is unknown on lttng-relayd
side. In those cases, we do not perform any transformation and leave the
provided stream path as is. A warning (lttng-relayd) is emitted on such
occasions.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
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