Hi, The relevant api functions are the omap_* methods of ObjectWriteOperation and ObjectReadOperation, which can be found in src/include/rados/librados.hpp. Note, ObjectWriteOperation and ObjectReadOperation are transactions which are submitted using aio_operate or operate. src/test/rados-api/aio.cc has some usage examples in the OmapPP test. -Sam On Wed, Mar 21, 2012 at 6:56 AM, Tomasz Paszkowski <ss7pro@xxxxxxxxx> wrote: > Hi, > > Can write sth more about new key/value api or point part of the source > where we can get familiar with it. > > > On Wed, Mar 21, 2012 at 2:39 PM, Sage Weil <sage@xxxxxxxxxxxx> wrote: >> v0.44 is ready! Changes since v0.43 include: >> >> * osd: key/value objects (objects are now blobs, key/value bundles, and >> xattrs) >> * osd: cleaned up PG state, stats >> * osd: fixed transaction replay on non-btrfs after ill-timed failures >> * osd: several recovery fixes >> * radosgw: improved PUT performance >> * radosgw: improved list objects performance, filtering >> * radosgw: manifests for large objects >> * radosgw: Swift/S3 ACL interoperability (last set ACL type wins) >> * librados: new key/value object API >> * Ubuntu 12.04 precise packages >> >> The exciting part of this release is that the key/value "object map" >> work has been merged, along with radosgw changes to take advantage of the >> new API. This allows you to use a key/value interface to manage many >> small records in a single object, in addition of the regular object data >> and attributes. Keys in the same object are stored together on disk--just >> like object data would be--so there are locality advantages to putting >> related keys in the same object. However, there are no limits on how many >> keys per object beyond concerns about load and space balancing (all keys >> in an object are stored together on the same set of Ceph OSDs). This >> provides an interesting alternative to conventional distributed key/value >> stores like Cassandra that distribute all keys in a single namespace >> across all nodes. For example, radosgw now uses the new object map API to >> manage the index object for each bucket. >> >> For v0.45, we're continuing work on RBD caching, performance and bug >> fixes, and working around xattr size limitations in ext3/4. >> >> You can get v0.44 from the usual locations: >> >> * Git at git://github.com/ceph/ceph.git >> * Tarball at http://ceph.newdream.net/download/ceph-0.44.tar.gz >> * For Debian/Ubuntu packages, see >> http://ceph.newdream.net/docs/master/ops/install/mkcephfs/#installing-the-packages >> >> -- >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- > Tomasz Paszkowski > SS7, Asterisk, SAN, Datacenter, Cloud Computing > +48500166299 > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
