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Bug 1645693

Summary:	[RFE] Improve default logging of MDS
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Mike Hackett <mhackett>
Component:	CephFS	Assignee:	Patrick Donnelly <pdonnell>
Status:	CLOSED ERRATA	QA Contact:	Persona non grata <nobody+410372>
Severity:	low	Docs Contact:	Aron Gunn <agunn>
Priority:	high
Version:	3.2	CC:	ceph-eng-bugs, edonnell, pasik, pdonnell, rperiyas, tchandra, tserlin
Target Milestone:	z1	Keywords:	FutureFeature
Target Release:	3.2
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:	RHEL: ceph-12.2.8-71.el7cp Ubuntu: ceph_12.2.8-56redhat1	Doc Type:	Enhancement
Doc Text:	.Improved logging for Ceph MDS Now, the Ceph MetaData Server (MDS) outputs more metrics concerning client sessions by default to the debug log. This includes the creation of the client session and other metadata. This information is useful for storage administrators to see when a new client session is created and how long it took to establish a connection.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-03-07 15:50:56 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:
Bug Blocks:	1629656

Description Mike Hackett 2018-11-02 21:15:59 UTC

Description of problem:

Clearer and more concise logging from the MDS and Ceph cluster without requiring to boost debug logging levels.

More information from the cluster needs to be provided from the client/server perspective. We cannot always have high log levels enabled to capture data we require.

From Server Side: Client Mount time, Client ID, Latency in mounting, Path of the mount, Error Code on request (in a single line or use k=v format for logging) 

From Client Side: Client Mount time, Client ID, Latency in mounting, Path of the mount, Error Code on request (in a single line or use k=v format for logging)

From client side: When MDS switches, we disconnect and reconnect to a new MDS. Can we log/graph this on the client side through kernel module/libcephfs library? - would be interested in latency of the switch also.

Comment 9 Patrick Donnelly 2019-02-04 00:27:29 UTC

The new session log information is at "debug_mds=2" level. Once a client connects, you should be able to see a message like:

> 2018-12-17 17:21:31.682 7f822703c700  2 mds.0.server New client session: addr="127.0.0.1:60552/2307908923",elapsed=0.013384,throttled=0.000071,status="ACCEPTED",root="/"

Comment 17 errata-xmlrpc 2019-03-07 15:50:56 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-2019:0475