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Feature #21849

sparse-reads should not be used for small IO requests

Added by Jason Dillaman almost 2 years ago. Updated over 1 year ago.

Status:
Resolved
Priority:
Normal
Target version:
-
Start date:
10/19/2017
Due date:
% Done:

0%

Source:
Tags:
Backport:
luminous
Reviewed:
Affected Versions:
Pull request ID:

Description

There is a larger time and space overhead for performing a sparse read so it should be avoided for small IO. Backend support for sparse-read is disabled by default for filestore, and bluestore defaults to 16K allocations for SSDs and 64K allocations for HDDs. Perhaps it would be simplest to just restrict sparse-read to only the cases where the full object is being read and provide an advanced-level config override to lower the requirement if needed.


Related issues

Copied to rbd - Backport #21920: luminous: sparse-reads should not be used for small IO requests Resolved

History

#1 Updated by Jason Dillaman almost 2 years ago

  • Status changed from New to In Progress
  • Backport set to luminous

#2 Updated by Jason Dillaman almost 2 years ago

  • Assignee set to Jason Dillaman

#3 Updated by Jason Dillaman almost 2 years ago

  • Status changed from In Progress to Need Review

#4 Updated by Mykola Golub almost 2 years ago

  • Status changed from Need Review to Pending Backport

#5 Updated by Nathan Cutler almost 2 years ago

  • Copied to Backport #21920: luminous: sparse-reads should not be used for small IO requests added

#6 Updated by Jason Dillaman over 1 year ago

  • Status changed from Pending Backport to Resolved

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