Tasks #1039: cfuse: requests max_size from non-auth MDS - CephFS - Ceph

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Tasks #1039

closed

Ceph - Bug #910: Multi-MDS Ceph does not pass fsstress

cfuse: requests max_size from non-auth MDS

Added by Greg Farnum almost 13 years ago. Updated over 7 years ago.

Status:

Resolved

Priority:

Normal

Assignee:

Greg Farnum

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Target version:

% Done:

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Description

See kai:/home/gregf/logs/fsstress/cfuse_caps

The export of caps seems to go well, and the client drops them, but the next time the MDS encodes inodestats/caps for a request on a child inode it reissues caps to the client, and those seem to take over the ones from the auth. Not sure if the problem is that the client is misdirecting requests or that the MDS is doing it wrong (well, it's obviously doing it wrong, but maybe that's because it's not supposed to be doing it at all).

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Updated by Greg Farnum almost 13 years ago

Status changed from New to In Progress
Assignee set to Greg Farnum

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Updated by Greg Farnum almost 13 years ago

Okay, the replica MDS is behaving appropriately -- it's issuing only shared caps. It looks like the problem is that for the client these shared caps then prevent it from appropriately updating the master MDS with its new max_size. Trying to figure out exactly why now.

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Updated by Greg Farnum almost 13 years ago

Subject changed from non-auth MDS reissues client caps to cfuse: requests max_size from non-auth MDS

So the replica mds0 caps are examined before the auth mds1 caps are, and then the client requests a new max_size from mds0, which updates the requested_max_size et al so it doesn't request changes from mds1. Bah, working out a fix.

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Updated by Greg Farnum almost 13 years ago

Testing out a fix now based on only updating max_size on the auth_cap but it'll take a few runs to verify and I want to see if there are any similar problems that might crop up.

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