Bug 1607583

Summary:	MDS handles inter-MDS write locks inefficiently during create/remove workflows on a common directory
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Patrick Donnelly <pdonnell>
Component:	CephFS	Assignee:	Patrick Donnelly <pdonnell>
Status:	CLOSED ERRATA	QA Contact:	ceph-qe-bugs <ceph-qe-bugs>
Severity:	low	Docs Contact:
Priority:	low
Version:	3.0	CC:	anharris, ceph-eng-bugs, ceph-qe-bugs, hnallurv, john.spray, tserlin
Target Milestone:	z5	Keywords:	CodeChange
Target Release:	3.0
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:	RHEL: ceph-12.2.4-39.el7cp Ubuntu: ceph_12.2.4-44redhat1	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-08-09 18:27:51 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 Patrick Donnelly 2018-07-23 19:23:13 UTC

Description of problem:

Upstream ticket description:

"Recently, when trying to create/remove massive files/dirs(7x10^6) within a common directory, we found that as the creations go on, the time to create a single file/dir increases. After a series analysis, we found that this is due to the traversal of dirfrags the number of which increases exponentially as the number of subdirs/subfiles increases."

Comment 10 errata-xmlrpc 2018-08-09 18:27:51 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://access.redhat.com/errata/RHBA-2018:2375