Bug 1143960

Summary:	Add logs in Posix to detect multiple directories having same gfid
Product:	[Red Hat Storage] Red Hat Gluster Storage	Reporter:	Raghavendra G <rgowdapp>
Component:	distribute	Assignee:	Raghavendra G <rgowdapp>
Status:	CLOSED ERRATA	QA Contact:	storage-qa-internal <storage-qa-internal>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rhgs-3.0	CC:	ajha, asrivast, nsathyan, smohan, ssamanta, vagarwal
Target Milestone:	---	Keywords:	Patch, ZStream
Target Release:	RHGS 3.0.1
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	glusterfs-3.6.0.29-1	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-09-29 07:46:52 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:
Bug Depends On:	1105082
Bug Blocks:	1139774

Description Raghavendra G 2014-09-18 10:32:02 UTC

Description of problem:
consider following steps on a distribute volume

1. rename (src, dst) on hashed subvolume
2. snapshot taken
3. restore snapshots and do stat on src and dst

Now, we end up with two directories src and dst having same gfid,
because of distribute creating directories on non-existent subvolumes
as part of directory healing.

This can happen even with race between rename and directory healing in
dht-lookup. This can lead to undefined behaviour while accessing any
of both directories. Hence, we are logging paths of both
directories, so that a sysadmin can take some corrective action when
(s)he sees this log. One of the corrective action can be to copy
contents of both directories from backend into a new directory and
delete both directories.

Since effort involved to fix this issue is non-trivial, giving this
workaround till we come up with a fix.

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


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Comment 1 Nagaprasad Sathyanarayana 2014-09-18 12:25:57 UTC

Downstream patch URL: https://code.engineering.redhat.com/gerrit/#/c/32942/

Comment 3 errata-xmlrpc 2014-09-29 07:46:52 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.

http://rhn.redhat.com/errata/RHBA-2014-1315.html