cluster/afr: Hybrid Halo mounts Summary: - Implements "Hybrid" halo mounts which perform write FOPs synchronously to all regions and read FOPs asynchronously to those nodes within the region. - Leverages the fact that the inode cache stores "hints" as to the clean/dirty state of upto 16 replicas in the cluster; upon refresh of an inode we can do a fresh lookup to get a "wise" node if none exist in our region - Activated via the cluster.halo-hybrid-mode option Test Plan: - Run AFR prove tests - Run halo prove tests Reviewers: kvigor, sshreyas Reviewed By: kvigor, sshreyas FB-commit-id: aca760757afd45e4de2e28dc31b87a73ee52f12d Change-Id: Ic6728ce93b7b96e3151dccdebccd30e007f4750c Signed-off-by: Kevin Vigor <kvigor> Reviewed-on: http://review.gluster.org/16306 CentOS-regression: Gluster Build System <jenkins.org> NetBSD-regression: NetBSD Build System <jenkins.org> Smoke: Gluster Build System <jenkins.org> Reviewed-by: Shreyas Siravara <sshreyas>
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.