[Gluster-devel] Self-heal with partial files

Krishna Srinivas krishna at zresearch.com
Thu Oct 4 04:26:21 UTC 2007

Hi Kevan,

It should have worked fine in your case. What version of glusterfs are
you using? Just before you do the second read (or open rather) which
should have triggered self-heal can you do getfattr -n trusted.afr.version <>
on the partial file and also the full file  in the backend and give the output?


On 10/4/07, Kevan Benson <kbenson at a-1networks.com> wrote:
> Is self heal supposed to work with partial files?  I have an issue where
> self-heal isn't happening on some servers with AFR and unify in a HA
> setup I developed.  Two servers, two clients, all AFR and unify done on
> client side.
> If I kill a connection while a large file is being written, the
> glusterfs mount waits the appropriate timeout period (10 seconds in my
> case) and then finishes writing the file to the still active server.
> This results in a full file on one server and a partial file on the
> other (the one I stopped traffic to temporarily to simulate a
> crash/network problem).  If I then enable the disabled server and read
> data from the problematic file, it doesn't self-heal  itself and move
> the full file to the server with the partial file.
> Anything written entirely while a server is offline (i.e. the offline
> server has no knowledge of it) is correctly created on read from the
> file, so the problem seems to be related to files that are partially
> written to one server.
> Can someone comment on the particular conditions that cause a self
> heal?  Is there something I can do to force it to self heal at this
> point (I repeat that reading data from the file does not work).  I know
> I can use rsync and some foo to fix this, but that becomes less and less
> feasible as the mount size grows and the time for rsync to compare sides
> lengthens.
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