Bug 1591873 - Set default filestore_merge_threshold = -10
Summary: Set default filestore_merge_threshold = -10
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Ceph Storage
Classification: Red Hat Storage
Component: RADOS
Version: 3.1
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: rc
: 3.1
Assignee: Douglas Fuller
QA Contact: Tiffany Nguyen
Aron Gunn
URL:
Whiteboard:
Depends On: 1602921
Blocks: 1581350 1584264
TreeView+ depends on / blocked
 
Reported: 2018-06-15 17:47 UTC by Douglas Fuller
Modified: 2018-09-26 18:23 UTC (History)
14 users (show)

Fixed In Version: RHEL: ceph-12.2.5-28.el7cp Ubuntu: ceph_12.2.5-14redhat1
Doc Type: Enhancement
Doc Text:
.The `filestore_merge_threshold` option default has changed Subdirectory merging has been disabled by default. The default value of the `filestore_merge_threshold` option has changed to -10 from 10. It has been observed to improve performance significantly on larger systems with a minimal performance impact to smaller systems. To take advantage of this performance increase set the `expected-num-objects` value when creating new data pools. See the link:{object-gw-production}#creating-a-data-pool-rgw-adv[Object Gateway for Production Guide] for more information.
Clone Of:
Environment:
Last Closed: 2018-09-26 18:22:08 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Ceph Project Bug Tracker 24686 0 None None None 2018-06-28 14:32:45 UTC
Red Hat Product Errata RHBA-2018:2819 0 None None None 2018-09-26 18:23:34 UTC

Description Douglas Fuller 2018-06-15 17:47:32 UTC 
Larger RGW deployments often thrash RADOS objects and incur performance penalties during filestore split and merge operations. Disable filestore merging automatically for these deployments.

Set:

[osd]
filestore_merge_threshold = -1 #default 10
Comment 3 Douglas Fuller 2018-06-28 14:33:37 UTC 
-10 is a better choice because the absolute value is used in some filestore calculations.
Comment 4 Douglas Fuller 2018-06-28 15:10:10 UTC 
https://github.com/ceph/ceph/pull/22761
Comment 9 Tiffany Nguyen 2018-08-24 05:26:50 UTC 
Verified with build 12.2.5-39.el7cp.  filestore_merge_threshold is set as -10 by default.

[root@c04-h05-6048r ~]# ceph -v 
ceph version 12.2.5-39.el7cp (f12d44e46a54948a86dd27b16c77d97475ba2d4e) luminous (stable) 
[root@c04-h05-6048r ~]# ceph daemon osd.0 config get filestore_merge_threshold  
{ 
    "filestore_merge_threshold": "-10" 
}
Comment 12 errata-xmlrpc 2018-09-26 18:22:08 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-2018:2819
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