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Bug 1428085

Summary:	Add option to toggle x-halo fail-over
Product:	[Community] GlusterFS	Reporter:	Vijay Bellur <vbellur>
Component:	replicate	Assignee:	bugs <bugs>
Status:	CLOSED DEFERRED	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	mainline	CC:	bugs, ravishankar
Target Milestone:	---	Keywords:	Triaged
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
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Last Closed:	2019-03-08 04:42:50 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Embargoed:

Description Vijay Bellur 2017-03-01 19:06:32 UTC

Add option to toggle x-halo fail-over

Summary:
- Adds "halo-failover-enabled" option to enable/disable failing over to a brick outside of the defined halo to satisfy min-replicas
- There are some use-cases where failing over to a brick which is out of region will be undesirable.  I such cases we will more than likely opt to have more replicas within the region to tolerate the loss of a single replica in that region without losing quorum.
- Fixed quorum accounting problem as well, now correctly goes RO in case where we lose a brick and aren't able to swap one in for some reason (fail-over not enabled or otherwise)

Test Plan:
- run prove -v tests/basic/halo.t
- run prove -v tests/basic/halo-disable.t
- run prove -v tests/basic/halo-failover-enabled.t
- run prove -v tests/basic/halo-failover-disabled.t

Reviewers: dph, cjh, jackl, mmckeen

Reviewed By: mmckeen

Conflicts:
	xlators/cluster/afr/src/afr.h
	xlators/mount/fuse/utils/mount.glusterfs.in

Change-Id: Ia3ebf83f34b53118ca4491a3c4b66a178cc9795e
Signed-off-by: Kevin Vigor <kvigor>
Reviewed-on: http://review.gluster.org/16275
CentOS-regression: Gluster Build System <jenkins.org>
NetBSD-regression: NetBSD Build System <jenkins.org>
Reviewed-by: Shreyas Siravara <sshreyas>
Smoke: Gluster Build System <jenkins.org>

Comment 1 Ravishankar N 2019-03-08 04:42:50 UTC

Basic halo replication functionality is present in master.There are no immediate plans for forward porting any pending halo related patches from the release-3.8-fb branch into master, hence closing the bug. Please feel free to re-open if there is a need for re-assessment.