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

 
 

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

Submitter:  A. D Auria <adauria>
Submitted:  Fri 09 Mar 2007 11:43:01 AM UTC
   
 
Category:  GlusterFS Severity:  3 - Normal
Priority:  5 - Normal Item Group:  Improper behaviour
Status:  Fixed Privacy:  Public
Assigned to:  avati Originator Name:  *
Open/Closed:  Closed Release: 
Operating System:  GNU/Linux Reproducibility:  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 Periasamy <ab>
Group 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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    Follow 3 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2007-05-06 avati StatusNone Fixed
        Assigned toNone avati
        Open/ClosedOpen Closed

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