[Bugs] [Bug 1428089] New: cluster/afr: Hybrid Halo mounts

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1428089

            Bug ID: 1428089
           Summary: cluster/afr: Hybrid Halo mounts
           Product: GlusterFS
           Version: mainline
         Component: core
          Assignee: bugs at gluster.org
          Reporter: vbellur at redhat.com
                CC: bugs at gluster.org



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 at fb.com>
Reviewed-on: http://review.gluster.org/16306
CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
Smoke: Gluster Build System <jenkins at build.gluster.org>
Reviewed-by: Shreyas Siravara <sshreyas at fb.com>

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