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Problem:
In EC and AFR, we launch synctasks during self-heal.
(i) These tasks usually stackwind a FOP to all its children and call
synctask_yield() which does a swapcontext to synctask_switchto() and puts the
task in syncenv's waitq by calling __wait(task). This happends as long as the
FOP ckbs from all children haven't been received.
(ii) For each FOP cbk, we call synctask_wake() which again does a swapcontext
to synctask_switchto() which now puts the task in syncenv's runq by calling
__run(task). When the task runs and the conext switches back to the FOP path,
it puts the task in waitq because we haven't heard from all children as
explained in (i).
Thus we are unnecessarily using the swapcontext syscalls to just toggle
the task back and forth between the waitq and runq.
Fix:
Store the stackwind count in new variable 'syncbarrier->waitfor' before
winding the fop. In each cbk when we call synctask_wake(), perform an actual
wake only if the cbk count == stackwind count.
Change-Id: Id62d3b6ffed5a8c50f8b79267fb34e9470ba5ed5
BUG: 1434274
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
Signed-off-by: Ashish Pandey <aspandey@redhat.com>
Reviewed-on: https://review.gluster.org/16931
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>
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Problem-1
If Lookup which doesn't take any locks observes version mismatch it can't be
trusted. If we launch a heal based on this information it will lead to
self-heals which will affect I/O performance in the cases where Lookup is
wrong. Considering self-heal-daemon and operations on the inode from client
which take locks can still trigger heal we can choose to not attempt a heal on
Lookup.
Problem-2:
Fixed spurious failure of
tests/bitrot/bug-1373520.t
For the issues above, what was happening was that ec_heal_inspect()
is preventing 'name' heal to happen
Problem-3:
tests/basic/ec/ec-background-heals.t
To be honest I don't know what the problem was, while fixing
the 2 problems above, I made some changes to ec_heal_inspect() and
ec_need_heal() after which when I tried to recreate the spurious
failure it just didn't happen even after a long time.
BUG: 1414287
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Change-Id: Ife2535e1d0b267712973673f6d474e288f3c6834
Reviewed-on: https://review.gluster.org/16468
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Xavier Hernandez <xhernandez@datalab.es>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Ashish Pandey <aspandey@redhat.com>
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Change-Id: I92ff46bae36d39a449d4bbaedc88a322992f65eb
BUG: 1215265
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/10391
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Krutika Dhananjay <kdhananj@redhat.com>
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This patch implements syncop equivalent for cluster of xlators. The xlators on
which the fop needs to be performed is taken in input arguments to the
functions and the responses are gathered and provided as the output.
This idea is taken from afr-v2 self-heal implementation by Avati.
Change-Id: I2b568f4340cf921a65054b8ab0df7edc4478b5ca
BUG: 1213358
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/10240
Reviewed-by: Krutika Dhananjay <kdhananj@redhat.com>
Tested-by: NetBSD Build System
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
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