bugGluster - Bugs: bug #19257, read-ahead with writebehind locks...

 
 

bug #19257: read-ahead with writebehind locks up under heavy RW load

Submitted by:  A. D Auria <adauria>
Submitted on:  Fri 09 Mar 2007 11:43:01 AM UTC  
 
Category: GlusterFSSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Improper behaviour
Status: FixedPrivacy: Public
Assigned to: Anand Avati <avati>Originator Name: 
Open/Closed: ClosedRelease: 
Operating System: GNU/LinuxReproducibility: None

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Sun 01 Apr 2007 05:41:02 PM UTC, comment #1:

Do you still notice this problem from the TLA version?

Anand Babu <ab>
Project Administrator
Fri 09 Mar 2007 11:43:01 AM UTC, original submission:

[configuration...]
Using latest TLA version (09-march-2007)
...
volume writebehind
type performance/write-behind
option aggregate-size 131072
subvolumes bricks
end-volume

volume readahead
type performance/read-ahead
option page-size 131072
option page-count 16
subvolumes writebehind
end-volume

[Observation...]
In the above configuration, our writing process was able to run for an extended period of time (several hours). As soon as we started our reading process however, all reading and writing processes stopped responding. No crashes, no log reports, nothing. No further traffic was observed.

For us to recover the client, we had 'umount -f' the gluster mount point and then 'kill -9 glusterfs'.

After removing the 'volume readahead' section and restarting the client, everything worked properly (without readahead). Reading and writing with high loads works properly with writebehind only.

A. D Auria <adauria>

 

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  • -unavailable- added by avati (Updated the item)
  • -unavailable- added by ab (Posted a comment)
  • -unavailable- added by adauria (Submitted the item)
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    Follow 3 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Sun 06 May 2007 10:31:20 AM UTCavatiStatusNone=>Fixed
      Assigned toNone=>avati
      Open/ClosedOpen=>Closed

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