cluster/tier: make promotion and demotion independant

Currently a main loop in tiering spawns promotion and demotion threads,
and does a join to wait for them to complete. When one of the two
threads takes a long time, the main thread waits for it
before exiting the join. It may wait so long the scheduled time
for the other thread is skipped. In the case of demotion, it may be
a long time before another attempt. This patch fixes that by
making the promotion and demotion activities independant. A side
effect of this change is the logic is significantly simplified.

Change-Id: I1196bd4bbfc95e8aa326a9bd4ebf395032369d1c
BUG: 1306852
Signed-off-by: Dan Lambright <dlambrig@redhat.com>
Reviewed-on: http://review.gluster.org/13433
Smoke: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Joseph Fernandes
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>

0 files changed, 0 insertions, 0 deletions