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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 1 month ago. Updated 7 days ago.

Status:
Pending Backport
Priority:
High
Assignee:
Category:
-
Target version:
Start date:
11/05/2018
Due date:
% 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:

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

History

#1 Updated by Patrick Donnelly about 1 month ago

  • Target version set to v14.0.0

#2 Updated by Venky Shankar about 1 month ago

  • Status changed from In Progress to Need Review

#3 Updated by Patrick Donnelly 7 days ago

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

#4 Updated by Nathan Cutler 3 days 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 3 days ago

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

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