backport #13769: EC async "fast read" patchset for hammer #6542
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Extend the PGBackend::objects_read_async interface to support *fast read*, add the implemenation for ECBackend, in which we issue redundant reads, and use the first returned (to decode) to serve clients. Backport: Hammer Signed-off-by: Guang Yang <yguang@yahoo-inc.com> (cherry picked from commit 131214d)
Backport: Hammer Signed-off-by: Guang Yang <yguang@yahoo-inc.com> Signed-off-by: Tushar Gohad <tushar.gohad@intel.com> (cherry-picked from commit 5eb2a77)
Backport: Hammer Signed-off-by: Guang Yang <yguang@yahoo-inc.com> Signed-off-by: Tushar Gohad <tushar.gohad@intel.com> (cherry-picked from commit 54090f1)
tsg-
changed the title
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@tsg backports should be against the hammer branch, not the hammer-backports branch. You will find more information about backporting at http://tracker.ceph.com/projects/ceph-releases/wiki/HOWTO_backport_commits |
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Thanks @dachary! Sorry newbie error. Let me resubmit. :^) |
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@tsg thanks :-) |
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EC read latency improvement. Commits backported:
131214d ec: add support for fast read on PGBackend/ECBackend async read
5eb2a77 mon: add a new pool setting to configure fast read for EC pool
54090f1 mon: add a configuration for default fast read setting