On Sat, Oct 15, 2016 at 1:36 AM, Heller, Chris <chel...@akamai.com> wrote:
> Just a thought, but since a directory tree is a first class item in cephfs,
> could the wire protocol be extended with an “recursive delete” operation,
> specifically for cases like this?
In principle yes, but the problem is that the POSIX filesystem
interface doesn't have a recursive delete operation (we just see a
series of individual unlinks), so the complicated part would be making
the client clever enough to notice when a series of unlink operations
appear to be traversing a particular directory, and batching them up
until all files in a directory are unlinked, and then finally sending
a recursive unlink message to the server.
> On 10/14/16, 4:16 PM, "Gregory Farnum" <gfar...@redhat.com> wrote:
> On Fri, Oct 14, 2016 at 1:11 PM, Heller, Chris <chel...@akamai.com> wrote:
> > Ok. Since I’m running through the Hadoop/ceph api, there is no syscall
> boundary so there is a simple place to improve the throughput here. Good to
> know, I’ll work on a patch…
> Ah yeah, if you're in whatever they call the recursive tree delete
> function you can unroll that loop a whole bunch. I forget where the
> boundary is so you may need to go play with the JNI code; not sure.
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