Feature #17979: mds: disable early replies when the MDS has slow RADOS requests - CephFS - Ceph

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Feature #17979

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mds: disable early replies when the MDS has slow RADOS requests

Added by John Spray over 7 years ago. Updated about 5 years ago.

Status:

New

Priority:

Normal

Assignee:

Category:

Performance/Resource Usage

Target version:

% Done:

Source:

Development

Tags:

qos

Backport:

Reviewed:

Affected Versions:

Component(FS):

MDS

Labels (FS):

Pull request ID:

Description

This is a primitive form of flow control.

Currently, if the MDS is experiencing a backlog of RADOS operations, the clients may continue to send lots of metadata operations and proceed with their own data operations. If the data and metadata pools share OSDs, that can exacerbate the situation.

To convince the clients to slow down a bit when the MDS is having trouble getting OSD operations completed, we should disable early replies to clients when there are any slow requests in the Objecter on the MDS.

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Updated by Vishal Kanaujia over 7 years ago

Assignee set to Vishal Kanaujia

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Updated by Patrick Donnelly about 6 years ago

Subject changed from Disable early replies when the MDS has slow RADOS requests to mds: disable early replies when the MDS has slow RADOS requests
Assignee deleted (~~Vishal Kanaujia~~)
Target version changed from v12.0.0 to v14.0.0
Source set to Development
Tags set to qos