relayd: introduce --group-output-by-session
authorJonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Thu, 19 Sep 2019 20:56:11 +0000 (16:56 -0400)
committerJérémie Galarneau <jeremie.galarneau@efficios.com>
Fri, 8 Nov 2019 22:33:41 +0000 (17:33 -0500)
commita8b66566890a353cc3a89836281541195ad69d73
tree1f1b539984aacf92467689dbae016a73965bac7d
parenta70ac2f49aa47a30abc2b50ec57b582eab4b1028
relayd: introduce --group-output-by-session

LTTng-relayd now support the grouping of traces per session.
This mode can be used via the "--group-output-per-session" switch.

The default, and current way, of grouping is done around the host
(hostname) of the traced system.

When grouped by host the following folder hierarchy is mostly found on the filesystem:

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

When using "--group-output-per-session", the following hierarchy is
found on the filesystem:

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

We also need to support base path information that come from the URIs
set at the client level:

    lttng create --set-url=net://localhost/extra/path/information

When grouping by host (current behaviour), it result in the following
hierarchy:

    <hostname>/<base_path>/<trace>

e.g:
    <hostname>/extra/path/information/<trace>

We want to part from this way of handling the base path since it can lead
to unexpected conflict between session.

When grouping by session using a base path, the following hierarchy is
produced:

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

e.g:
    <session_name>/<hostname>-<datetime>/extra/path/information/<trace>

We encourage user to move away from using base path entirely as it
bypasses introduces potential name clashes and completely bypasses the
relay daemon's storage policy.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
src/bin/lttng-relayd/lttng-relayd.h
src/bin/lttng-relayd/main.c
src/bin/lttng-relayd/session.c
src/common/time.c
src/common/time.h
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