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Bug #36703

MDS admin socket command `dump cache` with a very large cache will hang/kill the MDS

Added by Venky Shankar about 4 years ago. Updated almost 4 years ago.

Status:
Resolved
Priority:
High
Assignee:
Category:
-
Target version:
% Done:

0%

Source:
Community (dev)
Tags:
Backport:
luminous,mimic
Regression:
No
Severity:
2 - major
Reviewed:
Affected Versions:
ceph-qa-suite:
Component(FS):
MDS
Labels (FS):
Pull request ID:
Crash signature (v1):
Crash signature (v2):

Description

The MDS tries to dump the cache to a formatter which will not work well if the MDS cache is too large (probably starting around 1GB).

Till we fully fix the underlying issue, MDS can err back if the cache is too large to dump. Need to do tests with large cache sizes to determine the limit.


Related issues

Copied to CephFS - Backport #37608: luminous: MDS admin socket command `dump cache` with a very large cache will hang/kill the MDS Resolved
Copied to CephFS - Backport #37609: mimic: MDS admin socket command `dump cache` with a very large cache will hang/kill the MDS Resolved

History

#1 Updated by Patrick Donnelly about 4 years ago

  • Target version set to v14.0.0

#2 Updated by Venky Shankar about 4 years ago

  • Status changed from In Progress to Fix Under Review

#3 Updated by Patrick Donnelly almost 4 years ago

  • Status changed from Fix Under Review to Pending Backport
  • Pull request ID set to 24991

#4 Updated by Nathan Cutler almost 4 years ago

  • Copied to Backport #37608: luminous: MDS admin socket command `dump cache` with a very large cache will hang/kill the MDS added

#5 Updated by Nathan Cutler almost 4 years ago

  • Copied to Backport #37609: mimic: MDS admin socket command `dump cache` with a very large cache will hang/kill the MDS added

#6 Updated by Patrick Donnelly almost 4 years ago

  • Status changed from Pending Backport to Resolved

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