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Summary:
- Changes halo-decision to be based on the lowest halo value observed
- Adds halo-min-sample option to wait until N latency samples have been
gathered prior to activating halos.
- Fixed 3 edge cases where halo's weren't being correctly
config'd, or not configured as quickly as is possible. Namely:
1. Don't mark a child down if there's no better alternative (and you'd
no longer satisfy min/max replicas); fixes unneccessary flapping.
2. If a child goes down and this causes us to fall below max_replicas,
swap in a warm child immediately if it is within our halo latency
(don't wait around for the next "ping"); swaps in a new child
immediately helping with resiliency.
3. If the child latency is within the halo, and it's currently marked
up, mark it down if it's the highest latency child and the number of
children is > max_replicas; this will allow us to support the
SHD use-case where we can "beam" a single copy to a geo and have it
replicate within the geo after that.
- More commenting
Test Plan:
- Run halo prove tests
- Pointed compiled code at gfsglobal.prn2, tested out an NFS daemon and
FUSE mounts to ensure they worked as expected on a large scale
cluster.
Reviewers: dph, jackl, cjh, mmckeen
Reviewed By: mmckeen
FB-commit-id: 7e2e8ae6b8ec62a5e0b31c9fd6100c81795b3424
Change-Id: Iba2b2f1bc848b4546cb96117ff1895f83953a4f8
Signed-off-by: Kevin Vigor <kvigor@fb.com>
Reviewed-on: http://review.gluster.org/16304
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Shreyas Siravara <sshreyas@fb.com>
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Summary:
- Master option for halo geo-replication
- Added prove test for halo mode
- Updated options do values which should work "out of the box" for most use-cases, just run "enable" halo mode and you are done, the options can be tweaked as needed from there.
Test Plan:
- Enabled option, verified halo works, disabled option verified async
behavior is disabled
- Ran "prove -v tests/basic/halo.t" -> https://phabricator.fb.com/P12074204
Reviewers: jackl, dph, cjh
Reviewed By: cjh
Subscribers: meyering
Differential Revision: https://phabricator.fb.com/D1386675
Tasks: 4117827
Conflicts:
xlators/cluster/afr/src/afr-self-heal-common.c
xlators/cluster/afr/src/afr.h
Change-Id: Ib704528d438c3a42150e30974eb6bb01d9e795ae
Signed-off-by: Kevin Vigor <kvigor@fb.com>
Reviewed-on: http://review.gluster.org/16172
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Shreyas Siravara <sshreyas@fb.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
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