New features:
- Volume Snapshots
Distributed lvm thin-pool based snapshots for backing up volumes
in a Gluster Trusted Storage Pool. Apart from providing cluster
wide co-ordination to trigger a consistent snapshot, several
improvements have been performed through the GlusterFS stack to
make translators more crash consistent. Snapshotting of volumes is
tightly coupled with lvm today but one could also enhance the same
framework to integrate with a backend storage technology like btrfs
that can perform snapshots.
- Erasure Coding
Xavier Hernandez from Datalab added support to perform erasure
coding of data in a GlusterFS volume across nodes in a Trusted
Storage Pool. Erasure Coding requires fewer nodes to provide better
redundancy than a n-way replicated volume and can help in reducing
the overall deployment cost. We look forward to build on this
foundation and deliver more enhancememnts in upcoming releases.
- Better SSL support
Multiple improvements to SSL support in GlusterFS. The GlusterFS
driver in OpenStack Manila that provides certificate based access
to tenants relies on these improvements.
- Meta translator
This translator provides a /proc like view for examining internal
state of translators on the client stack of a GlusterFS volume and
certainly looks like an interface that I would be heavily consuming
for introspection of GlusterFS.
- Automatic File Replication (AFR) v2
A significant re-factor of the synchronous replication translator,
provides granular entry self-healing and reduced resource consumption
with entry self-heals.
- NetBSD, OSX and FreeBSD ports
Lot of fixes on the portability front. The NetBSD port passes most
regression tests as of 3.6.0. At this point, none of these ports
are ready to be deployed in production. However, with dedicated
maintainers for each of these ports, we expect to reach production
readiness on these platforms in a future release.
Complete releases notes are available at
https://github.com/gluster/glusterfs/blob/release-3.6/doc/release-notes/3.6.0.md
* Improvements for Virtual Machine Image Storage
A number of improvements have been performed to let Gluster volumes provide
storage for Virtual Machine Images. Some of them include:
- qemu / libgfapi integration.
- Causal ordering in write-behind translator.
- Tunables for a gluster volume in group-virt.example.
The above results in significant improvements in performance for VM image
hosting.
* Synchronous Replication Improvements
GlusterFS 3.4 features significant improvements in performance for
the replication (AFR) translator. This is in addition to bug fixes
for volumes that used replica 3.
* Open Cluster Framework compliant Resource Agents
Resource Agents (RA) plug glusterd into Open Cluster Framework
(OCF) compliant cluster resource managers, like Pacemaker.
The glusterd RA manages the glusterd daemon like any upstart or
systemd job would, except that Pacemaker can do it in a cluster-aware
fashion.
The volume RA starts a volume and monitors individual brick?s
daemons in a cluster aware fashion, recovering bricks when their
processes fail.
* POSIX ACL support over NFSv3
setfacl and getfacl commands now can be used on a nfs mount that
exports a gluster volume to set or read posix ACLs.
* 3.3.x compatibility
The new op-version infrastructure provides compatibility with 3.3.x
release of GlusterFS. 3.3.x clients can talk to 3.4.x servers and
the vice-versa is also possible.
If a volume option that corresponds to 3.4 is enabled, then 3.3
clients cannot mount the volume.
* Packaging changes
New RPMs for libgfapi and OCF RA are present with 3.4.0.
* Experimental Features
- RDMA-connection manager (RDMA-CM)
- New Block Device translator
- Support for NUFA
As experimental features, we don?t expect them to work perfectly
for this release, but you can expect them to improve dramatically
as we make successive 3.4.x releases.
* Minor Improvements:
- The Ext4 file system change which affected readdir workloads for
Gluster volumes has been addressed.
- More options for selecting read-child with afr available now.
- Custom layouts possible with distribute translator.
- No 32-aux-gid limit
- SSL support for socket connections.
- Known issues with replica count greater than 2 addressed.
- quick-read and md-cache translators have been refactored.
- open-behind translator introduced.
- Ability to avoid glusterfs bind to reserved ports.
- statedumps are now created in /var/run/gluster instead of /tmp by default.
Remove devel/py-ctypes (only needed by and supporting python24).
Remove PYTHON_VERSIONS_ACCEPTED and PYTHON_VERSIONS_INCOMPATIBLE
lines that just mirror defaults now.
Miscellaneous cleanup while editing all these files.
and the amount of data memory involved is not easy to forcast. We therefore
raise the limit to the maximum.
Patch from Manuel Bouyer. It helps completing a cvs update on a glusterfs
volume.
This maintenance release with no new features. Majot bug fixes are:
Bug 2464 Fixed all the issues caused by GFID mismatch during
distribute rename.
Bug 2988 Fixed the issue of high CPU usage when Directory Quota
is enabled.
Bug 3122 Enhanced the volume set interface to support io-threads
on the client.
Bug 3210 Fixed the issue of modified mtime/atime of the files after
rebalance operation.
Bug 3191 Fixed the issue with symlinks during rebalance operation.
