[sheepdog] [PATCH v2] sheep/md: change process of for_each_object_in_stale() to multi-threads

[Liu Yuan]

On Wed, Feb 26, 2014 at 11:43:28AM +0800, Robin Dong wrote:
> In our test environment, we upload 6TB data and kill one node, then the sheep
> daemons on each server will try to rename files from 'data' to '.stale', but
> the rename operations cost almost half an hour. And in this half an hour, the
> whole cluster can't be read or write.
> 
> To accelerate the speed of renames, we change for_each_object_in_stale() to
> multi-threads, which is one thread for one disk.
> 

I think you are optimizing the wrong place. You should multi-thread

for_each_object_in_wd()

instead of for_each_object_in_stale

Thanks
Yuan