Ceph » CephFS

The reason of slow creation/deletion is that ceph-fuse sends a getattr request (check permission of test directory) before each create/unlink request, test directory's ifile lock is in 'lock' state. So each getattr request needs to wait until previous creation/deletion operation finishes. Set fuse_default_permissions to false can avoid this issue.

Zheng Yan wrote:

The reason of slow creation/deletion is that ceph-fuse sends a getattr request (check permission of test directory) before each create/unlink request, test directory's ifile lock is in 'lock' state. So each getattr request needs to wait until previous creation/deletion operation finishes. Set fuse_default_permissions to false can avoid this issue.

So ceph-fuse when working in its own directory is the exclusive client on the directory and the getattr doesn't have to block on the create? Or is there something more at work here? If that's all, it seems our heuristics aren't working well enough because the directory's creator is no longer doing any work in it.

The problem is that getattr requests for permission check should only get Ax, but they actually get pAsLsXsFs. getting file size needs to wait until previous creation/deletion operation finishes