From Lustre Wiki
Revision as of 06:31, 2 July 2015 by Spitzcor (talk | contribs) (Make lockahead a current project)
Jump to navigation Jump to search

Current Projects

Feature Feature Summary Point of Contact Tracker Target Date (YYYY-MM)
DNE Phase IIb Asynchronous Commit of cross-MDT updates for improved performance. Remote rename and remote hard link functionality. Richard Henwood (Intel) LU-3534 2015-05
UID/GID mapping Map UID/GID for remote client nodes to local UID/GID on the MDS and OSS. Allows a single Lustre filesystem to be shared across clients with administrative domains. Stephen Simms (Indiana University) LU-3291 2015-05
Shared Key Crypto Allow node authentication and/or RPC encryption using symmetric shared key crypto with GSSAPI. Avoids complexity in configuring Kerberos across multiple domains. Stephen Simms (Indiana University) LU-3289 2015-11
NRS Delay policy Use NRS for fault injection. Intentionally delay request processing to simulate server load. Chris Horn (Cray) LU-6283 2015-05
Multiple modify RPCs Support of multiple slots per client (in last_rcvd file) for reply reconstruction of filesystem-modifying requests. Will improve the metadata operations performance of a single client Grégoire Pichon (Bull/Atos) LU-5319 2015-05
Lock ahead Allow user space to request LDLM extent locks in advance of need. Intended to optimize shared file IO. Patrick Farrell (Cray) LU-6179 2015-07

Future Projects

Feature Feature Summary Point of Contact Tracker
Patchless Server Remove Lustre kernel patches to allow Lustre servers to be more easily ported to new kernels, and to be built against vendor kernels without changing the vendor kernel RPMs. Andreas Dilger (Intel) LU-20
T10 End-to-End Data Integrity Add a path to pass T10 Protection Information from Lustre clients through to server disks to reduce CPU overhead of multiple checksum calculations. ? (Seagate) LU-2584
Layout Enhancement Add support for multiple layouts on a single file, for File Level Replication, Data on MDT, extent-based layouts, etc. John Hammond (Intel) LU-3480
ZFS ZIL Support Add support for the ZFS Intent Log (ZIL) to the Lustre osd-zfs Alex Zhuravlev (Intel) LU-4009
File Level Replication Phase 1 Solution Architecture and HDL, Exclusive Open, RAID 1 Layout, Layout Modification Method, Read Only RAID 1 Jinshan Xiong (Intel) LU-3254
File Level Replication Phase 2 Immediate asynchronous write from client. Jinshan Xiong (Intel) LU-3254
Data on MDT Allow small files to be stored directly on the MDT for reduced RPC count and improved performance. Mikhail Pershin (Intel) .
Quota for Projects Allow specifying a "project" or "subtree" identifier for files for accounting to a project, separate from UID/GID. Shuichi Ihara (DDN) LU-4017
Large Bulk IO Increase the OST bulk IO maximum size to 16MB or larger for more efficient disk IO submission. Shuichi Ihara (DDN) .
Kerberos Revival Fix up existing Kerberos code so it is tested working again. Sébastien Buisson (Bull/Atos) LU-6356

Potential Projects

These projects are potential areas of development that are looking for an interested party to work on or sponsor another developer to do. Many of them have more detailed descriptions, but it is worthwhile to contact the lustre-devel mailing list

Feature Feature Summary Complexity Tracker
ioctl() number cleanups Clean up Linux IOC numbering to properly use "size" field so that mixed 32- and 64-bit kernel/userspace ioctls work correctly. Attention needs to be paid to maintaining userspace compatibility for a number of releases, so the old ioctl() numbers cannot simply be removed. 1 20731
Updated man pages Update the online manual pages for Lustre user tools and the lustreapi library. Split the existing lfs.1 and lctl.8 man pages into separate pages for each sub-command, describing options and providing usage examples. 2 [1]
Improve testing Efficiency Improve the performance, efficiency, and coverage of the test scripts. As a basic step, printing the duration of each test script in the test summary would tell us where the testing time is being spent. 3 23051
Config save/edit/restore Need to be able to backup/edit/restore the client/MDS/OSS config llog files after a writeconf. One reason is for config recovery if the config llog becomes corrupted. Another reason is that all of the filesystem tunable parameters (including all of the OST pool definitions) are stored in the config llog and are lost if a writeconf is done. Being able to dump the config log to a plain text file, edit it, and then restore it would make administration considerably easier. 3 17094
Filesystem default OST pool Allow a filesystem-wide default OST pool to be specified. Currently, it is possible to set the default stripe count, size, index on a filesystem with "lfs setstripe" on the filesystem root, but the OST pool name is ignored. There is no other mechanism to specify default the OST pool for all new files in the filesystem, if no pool is specified. This would be useful for WAN or other heterogeneous OST configurations. 4 24314
Error message improvements Review and improve the Lustre error messages to be more useful. A larger project is to change the core Lustre error message handling to generate better structured error messages so that they can be parsed/managed more easily. 4
Improve QOS Round-Robin object allocator Improve LOV QOS allocator to always do weighted round-robin allocation, instead of degrading into weighted random allocations once the OST free space becomes imbalanced. This evens out allocations continuously, avoids crazy/bad OST allocation imbalances when QOS becomes active, and allows adding weighting for things like current load, OST RAID rebuild, etc. 5 [2]
RPC Replay Signatures Allow MDS/OSS to determine if client can legitimately replay an RPC, by digitally signing it at processing time and verifying the signature at replay time. 6 18547
Virtual Lustre Block Device Lustre object lloop driver exports block device to userspace, bypassing filesystem. Code partly works and is currently part of Lustre, but has correctness issues and potential performance problems. It needs to be ported to newer kernels. 6 [3]
Swap on Lustre Depends on the Lustre block device. Has problems when working under memory pressure, which makes it mostly useless until those problems are fixed. 7 5498
Directory readdir+ Bulk metadata readdir/stat interface to speed up "ls -l" operations. Send back requested inode attributes for all directory entries as part of the extended dirent data. Integrate with any proposed API for this on the client. Needs Large Readdir RPCs to be efficient over the wire, since more data will be returned for every entry. 7 17845
Small file IO aggregation Small file IO aggregation (multi-object RPCs), most likely for writes first, and possibly later for reads in conjunction with statahead. 7 944
Client-side data encryption Encrypt files and directories (or possibly just filenames) on the client before sending to the server. This avoids sending unencrypted data over the network, or ever having the data in plaintext on the server (in case of separate decryption from network, encryption on disk). 9 5286
Local object zero-copy IO Efficient data IO between a client and a local OST object; optimization to support local clients. Likely implemented as a fast-path connection between the OSC and the local OFD/OSD. Read cache should be kept on the OSD instead of at the client VFS level, so that the cache can be shared among all users of this OST. 9

Past Projects

Feature Feature Summary Point of Contact Tracker Target Date (YYYY-MM) Merge Date (YYYY-MM)
Dynamic LNET Config Introduces a user space script which will read routes from a config file and add those routes to LNET dynamically with the lctl utility. This allows the support of very large routing tables Amir Shehata (Intel) LU-2456 2014-11 2014-11
LFSCK Phase 3 - DNE consistency Enhance LFSCK to work with DNE filesystems, including remote directory entries, and OST orphan handling for multiple MDTs. Richard Henwood (Intel) LU-2307 2014-11 2014-11