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Bug 1245785

Summary:	Objecter: resend linger ops on split
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Josh Durgin <jdurgin>
Component:	RBD	Assignee:	Josh Durgin <jdurgin>
Status:	CLOSED ERRATA	QA Contact:	ceph-qe-bugs <ceph-qe-bugs>
Severity:	high	Docs Contact:
Priority:	high
Version:	1.2.3	CC:	ceph-eng-bugs, jdillama, kdreyer, mhackett, nlevine, tmuthami, wusui
Target Milestone:	rc
Target Release:	1.2.4
Hardware:	Unspecified
OS:	Linux
Whiteboard:
Fixed In Version:	ceph-0.80.8-15.el6cp ceph-0.80.8-15.el7cp	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-09-02 14:08:02 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Josh Durgin 2015-07-22 18:12:22 UTC

Description of problem:
Watches are not resent correctly if the number of pgs in a pool is increased (aka split).

This results in rbd snapshots not taking effect, and getting new data added to them past the point when the snapshot was taken (i.e. tracker.ceph.com/issues/12422)

Version-Release number of selected component (if applicable):
all ceph-1.2

How reproducible:
ce
Steps to Reproduce:
Assuming you're testing with a cluster with more than one osd, and using the 'rbd' pool with 8 pgs:

1. rbd create -s 1 --image-format 1 test

2. In one terminal leave this running: rbd watch test

3. In another terminal, double the number of pgs in the rbd pool:

ceph osd pool set rbd pg_num 16
sleep 30
ceph osd pool set rbd pgp_num 16
sleep 30

4. Check whether the watch is still there:

rados -p rbd listwatchers test.rbd


Actual results:
No watchers listed

Expected results:
Watchers still present

Additional info:

Comment 1 Josh Durgin 2015-07-22 18:14:15 UTC

Note that this only affects the 1.2 series - this fix is already included in hammer and rhcs1.3.

Comment 3 Ken Dreyer (Red Hat) 2015-07-30 03:57:08 UTC

The patch to fix this bug will be in Ceph v0.80.8.4 for non-RHEL.

Comment 4 Warren 2015-08-26 04:34:36 UTC

On trusty and precise, the test in the description returns

error listing watchers spool/test.rbd: (2) No such file or directory

Comment 5 Warren 2015-09-01 02:22:52 UTC

Passed on Centos 6.7 -- I ran this test five times without producing a failure

Comment 7 errata-xmlrpc 2015-09-02 14:08:02 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-1703.html

Comment 8 Tamil 2015-09-03 00:10:12 UTC

for the record, this bug was verified on centos 6.7, trusty and precise. works fine!

Comment 10 Mike Hackett 2015-10-14 21:49:21 UTC

*** Bug 1271827 has been marked as a duplicate of this bug. ***