On Thu, Sep 8, 2016 at 6:59 PM, Ilya Moldovan <il.moldovan@xxxxxxxxx> wrote: > Hello! > > How CephFS calculates the directory size? As I know there is two > implementations: > > 1. Recursive directory traversal like in EXT4 and NTFS > 2. Calculation of the directory size by the file system driver and save it > as an attribute. In this case, the driver catches adding, deleting and > editing files on the fly and changes the size of the directory. In this case > there is no need recursive directory traversal. > > The directory which we are requesting a size can potentially contain > thousands of files at different levels of nesting. > > Our components will call the the directory size using the POSIX API. The > number of calls of this attribute is will be high and recursive directory > traversal is not suitable for us. CephFS does not calculate the recursive statistics (rstats) every time you stat the directory -- accessing them is fast (although they are updated a little bit lazily). John > > Thanks for the answers! > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |