[LU-2869] extended attribute cache for Lustre

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.5.0
• Labels: patch xattr
• Assignee: James Nunez (Inactive)
• Reporter: Andrew Perepechko

Description

The patch implements an extended attribute cache for
a Lustre client. It is organized as a write-through
cache: reads are performed from cache, updates are sent
synchronously to the MDS. An additional inode bit
is added to protect the cache.

The patch itself will be uploaded shortly.

Issue Links

• is related to: LU-3795 replay-single test_58b test_58c: trusted.foo: No such attribute
• is related to: LU-3670 some trusted xattrs are not coherent on the client
• is related to: LU-3669 (mdt_xattr.c:178:mdt_getxattr()) ASSERTION( lu_object_assert_exists(&info->mti_object->mot_obj) ) failed:
• is related to: LU-549 Add xattr list/value cache on client
• is related to: LU-3583 LDLM support for atomic match_or_enqueue operation
• is related to: LU-10276 Revise what MDS_INODELOCK_XATTR protects
• is related to: LU-17238 negative xattr cache on client

Comments

[James Nunez (Inactive)]

Landed for 2.5

[Andrew Perepechko]

Thanks, James!

[James Nunez (Inactive)]

The master branch should open for new features soon.

[Andrew Perepechko]

Will this patch be inspected? It's almost three months from the patch upload. I had to rebase to a recent version.

[Nathan Rutman]

Sorry JC, the Xyratex tickets are really only useful for Xyratex engineers. We have posted the patch in the first comment above.

[jacques-charles lafoucriere]

Nathan the xyratex url is broken (server not found error), can you put a valid/public one ?

[Nathan Rutman]

Xyratex MRP-57

[Andrew Perepechko]

xattr cache performance for the simplest Lustre configuration (2 nodes), read case is faster for the cached version as compared with the uncached by 4.5 times

[Andrew Perepechko]

http://review.whamcloud.com/#change,5537