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diff --git a/doc/release-notes/3.5.0.md b/doc/release-notes/3.5.0.md new file mode 100644 index 00000000000..4f93da95016 --- /dev/null +++ b/doc/release-notes/3.5.0.md @@ -0,0 +1,150 @@ +## Major Changes and Features + +Documentation about major changes and features is also included in the `doc/features/` directory of GlusterFS repository. + +### AFR_CLI_enhancements + +The AFR reporting via CLI has been improved. This feature provides a coherent +mechanism to present heal status,information and the logs associated. +This makes the end user more aware of healing status and provides statistics. + +### File_Snapshot + +This feature provides ability to take snapshots of files in GlusterFS. +File snapshot is supported on the files of QCOW2/QED format. + +This feature adds better integration with Openstack Cinder, and +in general ability to take snapshots of files (typically VM images) + +For more information refer [here] +(http://www.gluster.org/community/documentation/index.php/Features/File_Snapshot). + +### gfid-access + +This feature add a new translator which is designed to provide direct access +to files in glusterfs using its GFID + +For more information refer [here] +(http://www.gluster.org/community/documentation/index.php/Features/gfid-access). + +### Prevent NFS restart on Volume change +Earlier any volume change (volume option, volume start, volume stop, volume +delete,brick add, etc) required restarting NFS server. + +With this feature, it is no longer required to restart NFS server, thereby +providing better usability with no disrupts in NFS connections + +### Features/Quota_Scalability + +This feature provides support upto 65536 quota configurations per volume. + +### readdir_ahead + +This feature provides read-ahead support for directories to improve sequential +directory read performance. + +### zerofill + +zerofill feature allows creation of pre-allocated and zeroed-out files on +GlusterFS volumes by offloading the zeroing part to server and/or storage +(storage offloads use SCSI WRITESAME), thereby achieves quick creation of + pre-allocated and zeroed-out VM disk image by using server/storage off-loads. + +For more information refer [here] +(http://www.gluster.org/community/documentation/index.php/Features/zerofill). + +### Brick_Failure_Detection + +This feature attempts to identify storage/file system failures and disable +the failed brick without disrupting the rest of the NODE operation. + +This adds a health-checker that periodically checks the status of the +filesystem (implies checking of functional storage-hardware). + +For more information refer [here] +(http://www.gluster.org/community/documentation/index.php/Features/Brick_Failure_Detection). + +### Changelog based distributed geo-replication + +New improved geo-replication which makes use of all the nodes in the master volume. +Unlike previous version of geo-replication where all changes were detected and synced +on a single node in master volume, now each node of master volume participates in the +geo-replication. + +Change Detection - Now geo-rep makes use of changelog xlator to detect the set of files +which needs to be synced. Changelog xlator runs per brick and when enabled, records +each fops which modifies the files. geo-rep consumes these journal created by this +xlator and syncs the files identified as 'changed' to slave. + +Distributed nature - Each of the nodes take the repsonsibility of syncing the data +which is present in that node. In case of replicated volume, one of them will be +'Active'ly syncing the data, while the other one is 'Passive'. + +Syncing Method - Apart from the using rsync as the syncing method, now there tar+ssh +syncing method, which can be leveraged by the workload where there is large amount +of smallfiles. + +### Improved block device translator + +This feature provides a translator to use logical volumes to store VM images +and expose them as files to QEMU/KVM. + +The Volume group is represented as directory and logical volumes as files. + +### Remove brick CLI Change + +remove-brick CLI earlier used to remove the brick forcefully ( without data migration ), +when called without any arguments. This mode of 'remove-brick' cli, without any +arguments has been deprecated. + +### Experimental Features + +The following features are experimental with this release: + +- RDMA-connection manager (RDMA-CM). +- support for NUFA translator. +- disk-encryption +- On-Wire Compression + Decompression [CDC] + +## Minor Improvements: + +- Old graphs are cleaned up by FUSE clients + +- New command "volume status tasks" introduced to track asynchronous tasks like rebalance and remove-brick + +- glfs_readdir(), glfs_readdirplus(), glfs_fallocate(), glfs_discard() APIs support added in libgfapi + +- Per client RPC throttling added in rpc server + +- Communication between cli and glusterd happens over unix domain socket + +- Information on connected NFS clients is persistent across NFS restarts. + +- Hardlink creation failures with SMB addressed + +- Non-local clients function with nufa volumes + +- Configurable option added to mount.glusterfs to use kernel-readdirp with fuse client + +- AUTH support for exported nfs sub-directories added + + +### Known Issues: +- The following configuration changes are necessary for qemu and samba + integration with libgfapi to work seamlessly: + + 1) gluster volume set <volname> server.allow-insecure on + + 2) Edit /etc/glusterfs/glusterd.vol to contain this line: + option rpc-auth-allow-insecure on + Post 1), restarting the volume would be necessary. + Post 2), restarting glusterd would be necessary. + +- RDMA connection manager needs IPoIB for connection establishment. More + details can be found [here] +(https://github.com/gluster/glusterfs/blob/master/doc/features/rdma-cm-in-3.4.0.txt). + + +- For Block Device translator based volumes open-behind translator at the +client side needs to be disabled. + |