Bug 1282771 - IO hangs after detach tier commit of nfs mount
IO hangs after detach tier commit of nfs mount
Product: Red Hat Gluster Storage
Classification: Red Hat
Component: tier (Show other bugs)
Unspecified Unspecified
urgent Severity urgent
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Assigned To: Dan Lambright
: ZStream
Depends On: 1306930
Blocks: 1358581
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Reported: 2015-11-17 06:21 EST by Bhaskarakiran
Modified: 2017-12-06 13:22 EST (History)
7 users (show)

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Doc Type: Bug Fix
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Clone Of:
: 1358581 (view as bug list)
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Type: Bug
Regression: ---
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RHEL 7.3 requirements from Atomic Host:
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Description Bhaskarakiran 2015-11-17 06:21:44 EST
Description of problem:

Created a 8+4 disperse volume and attached a 2x2 hot tier. While IO is running, detached hot tier and committed, IO hangs on the client. This is on NFS mount.

Version-Release number of selected component (if applicable):

[root@vertigo glusterfs]# gluster --version
glusterfs 3.7.5 built on Nov 10 2015 00:13:38
Repository revision: git://git.gluster.com/glusterfs.git
Copyright (c) 2006-2011 Gluster Inc. <http://www.gluster.com>
You may redistribute copies of GlusterFS under the terms of the GNU General Public License.
[root@vertigo glusterfs]# 

How reproducible:

Steps to Reproduce:
1. create a 8+4 ec volume and attach a 2x2 dist-rep hot tier
2. NFS mount on the client. untar kernel tarball and while it is in progress detach tier and commit.
3. Check the IO from client

Actual results:
IO hangs

Expected results:
IO should continue to run.

Additional info:
sosreports will be copied to rhsqe.
Comment 2 Soumya Koduri 2015-11-24 04:10:15 EST
It seems to be rpc throttle issue. I see so many outstanding requests during attach/detach-tier operations. Once the throttle limit is set to zero, I do not see any hangs. 

Request QE to try re-runnig the tests after disabling throttling and confirm if the issue still persist. Thanks!

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