doc: Create release notes for 3.11.1v3.11.1

Change-Id: I25988309111494e58bfb00c557262c8702928ab6
BUG: 1456850
Signed-off-by: Shyam <srangana@redhat.com>
Reviewed-on: https://review.gluster.org/17480
Smoke: Gluster Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Amar Tumballi <amarts@redhat.com>

1 files changed, 69 insertions, 0 deletions

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+# Release notes for Gluster 3.11.1
+
+This is a bugfix release. The release notes for [3.11.0](3.11.0.md), contains a
+listing of all the new features that were added and bugs fixed, in the
+GlusterFS 3.11 stable release.
+
+## Major changes, features and limitations addressed in this release
+
+### Improved disperse performance
+Fix for bug [#1456259](https://bugzilla.redhat.com/1456259) changes the way
+messages are read and processed from the socket layers on the Gluster client.
+This has shown performance improvements on disperse volumes, and is applicable
+to other volume types as well, where there maybe multiple applications or users
+accessing the same mount point.
+
+### Group settings for enabling negative lookup caching provided
+Ability to serve negative lookups from cache was added in 3.11.0 and with
+this release, a group volume set option is added for ease in enabling this
+feature.
+
+See [group-nl-cache](https://github.com/gluster/glusterfs/blob/release-3.11/extras/group-nl-cache) for more details.
+
+### Gluster fuse now implements "-oauto_unmount" feature.
+libfuse has an auto_unmount option which, if enabled, ensures that the file
+system is unmounted at FUSE server termination by running a separate monitor
+process that performs the unmount when that occurs. This release implements that
+option and behavior for glusterfs.
+
+Note that "auto unmount" (robust or not) is a leaky abstraction, as the kernel
+cannot guarantee that at the path where the FUSE fs is mounted is actually the
+toplevel mount at the time of the umount(2) call, for multiple reasons,
+among others, see:
+- fuse-devel: ["fuse: feasible to distinguish between umount and abort?"](http://fuse.996288.n3.nabble.com/fuse-feasible-to-distinguish-between-umount-and-abort-tt14358.html)
+- https://github.com/libfuse/libfuse/issues/122
+
+## Major issues
+
+1. Expanding a gluster volume that is sharded may cause file corruption
+    - Sharded volumes are typically used for VM images, if such volumes are
+  expanded or possibly contracted (i.e add/remove bricks and rebalance) there
+  are reports of VM images getting corrupted.
+    - Status of this bug can be tracked here, #1465123
+
+## Bugs addressed
+
+Bugs addressed since release-3.11.0 are listed below.
+
+- [#1456259](https://bugzilla.redhat.com/1456259): limited throughput with disperse volume over small number of bricks
+- [#1457058](https://bugzilla.redhat.com/1457058): glusterfs client crash on io-cache.so(__ioc_page_wakeup+0x44)
+- [#1457289](https://bugzilla.redhat.com/1457289): tierd listens to a port.
+- [#1457339](https://bugzilla.redhat.com/1457339): DHT: slow readdirp performance
+- [#1457616](https://bugzilla.redhat.com/1457616): "split-brain observed [Input/output error]" error messages in samba logs during parallel rm -rf
+- [#1457901](https://bugzilla.redhat.com/1457901): nlc_lookup_cbk floods logs
+- [#1458570](https://bugzilla.redhat.com/1458570): [brick multiplexing] detach a brick if posix health check thread complaints about underlying brick
+- [#1458664](https://bugzilla.redhat.com/1458664): [Geo-rep]: METADATA errors are seen even though everything is in sync
+- [#1459090](https://bugzilla.redhat.com/1459090): all: spelling errors (debian package maintainer)
+- [#1459095](https://bugzilla.redhat.com/1459095): extras/hook-scripts: non-portable shell syntax (debian package maintainer)
+- [#1459392](https://bugzilla.redhat.com/1459392): possible repeatedly  recursive healing of same file with background heal not happening when IO is going on
+- [#1459759](https://bugzilla.redhat.com/1459759): Glusterd segmentation fault in ' _Unwind_Backtrace' while running peer probe
+- [#1460647](https://bugzilla.redhat.com/1460647): posix-acl: Whitelist virtual ACL xattrs
+- [#1460894](https://bugzilla.redhat.com/1460894): Rebalance estimate time sometimes shows negative values
+- [#1460895](https://bugzilla.redhat.com/1460895): Upcall missing invalidations
+- [#1460896](https://bugzilla.redhat.com/1460896): [Negative Lookup Cache]Need a single group set command for enabling all required nl cache options
+- [#1460898](https://bugzilla.redhat.com/1460898): Enabling parallel-readdir causes dht linkto files to be visible on the mount,
+- [#1462121](https://bugzilla.redhat.com/1462121): [GNFS+EC] Unable to release the lock when the other client tries to acquire the lock on the same file
+- [#1462127](https://bugzilla.redhat.com/1462127): [Bitrot]: Inconsistency seen with 'scrub ondemand' - fails to trigger scrub
+- [#1462636](https://bugzilla.redhat.com/1462636): Use of force with volume start, creates brick directory even it is not present
+- [#1462661](https://bugzilla.redhat.com/1462661): lk fop succeeds even when lock is not acquired on at least quorum number of bricks
+- [#1463250](https://bugzilla.redhat.com/1463250): with AFR now making both nodes to return UUID for a file will result in georep consuming more resources