2011/9/20 Yehuda Sadeh Weinraub <yehudasa@xxxxxxxxx>: > On Tue, Sep 20, 2011 at 1:36 AM, Henry C Chang <henry.cy.chang@xxxxxxxxx> wrote: >> Hi, >> >> I have a question about the radosgw. >> >> The radosgw uses an object to record the buckets owned by one user >> account. However, suppose that the user account is shared by multiple >> users, and these users connect to the radosgw concurrently. If, say, >> user A creates bucket B1 and user B deletes bucket B2 at the same >> time, they will both update the object. Since it seems radosgw has no >> lock mechanism for object update, the problems would occurs - either >> the created bucket will be lost or the deleted bucket can still be >> listed but dne actually. >> >> I know it may be a rare case, just wondering if there is away to >> handle this situation. >> > > The RADOS gateway uses RADOS tmap atomic operations for modifying this > object. The tmap operations allows it to either add, remove, or modify > entries in this object without the need for locking and without > possible race conditions. > > Yehuda > That's cool. If possible, could you briefly explain how tmap operation works or is there any document I can refer to? Thanks, Henry -- 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
