On Fri, 28 Oct 2011 16:22:07 +0530, Atish Kathpal
<atish.kathpal@xxxxxxxxx> wrote:
> Hello developers,
>
> This is a users query. Please help out.
> I am trying to use the librados-dev library to use RADOS components of Ceph.
> I have got Ceph installed on my machine, and the rados command line
> shows me a pool named "data" when I say "rados lspools". I have also
> tried out creating objects in this pool and it works perfectly.
> However, when I try to access the same pool "data" through my C code,
> by using librados.h, my code compiles and links fine but at run time I
> get this error:-
>
> $./a.out: cannot open rados pool data: No such file or directory
>
> My code is as follows:-
> #include <stdio.h>
> #include "rados/librados.h"
> main(int argc, char *argv[])
> {
> int err;
> rados_t cluster;
> err = rados_create(&cluster, NULL);
> if (err < 0) {
> printf("%s: cannot open a rados connection: %s\n",
> argv[0], strerror(-err));
> }
You need a couple more steps here - rados_create doesn't connect to the
cluster yet. Looks like the docs need updating for this. You need to do
the following before opening the pool (error checking omitted for
brevity):
// get configuration info - use NULL as the path to search the
default ceph.conf locations
rados_conf_read_file(cluster, path);
rados_connect(cluster);
> rados_ioctx_t io;
> char *poolname = "data";
> err = rados_ioctx_create(cluster, poolname, &io);
> //<--------------------This line is causing the problem. Why am I not
> able to access the pool?
> if (err < 0) {
> printf("%s: cannot open rados pool %s: %s\n", argv[0],
> poolname, strerror(-err));
> rados_shutdown(cluster);
> }
> err = rados_write_full(io, "BITARRAY", "hello", 5);
> if (err < 0) {
> printf("%s: cannot write pool %s: %s\n", argv[0],
> poolname, strerror(-err));
> rados_ioctx_destroy(io);
> rados_shutdown(cluster);
> }
> }
>
> To show that the pool "data" exists, here's the output of the command
> line rados tool:-
> $ rados lspools
> data
> metadata
> rbd
>
>
> Please help me out.
>
> Thank you.
>
> Regards
> Atish
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