On Tue, 17 Feb 2015, Dennis Chen wrote: > Hello, > > For the case of multiple clients(separate process) accessing an object > in the cluster, is the exclusive protection of the shared object > needed for the caller? > > Process A::rados::ioctx.write(obj, ...) > Process B::rados::ioctx.write(obj, ...) This is correct. Racing reads/writes get ordered when they arrive at the OSD, and we make sure that updates are atomic and durable despite any OSD/disk/network failures. sage > > or: > > Process A:: > mylock.lock(); > ioctx.write(obj, ..) > mylock.unlock() > > Process B:: > mylock.lock(); > ioctx.write(obj, ..) > mylock.unlock() > > which one is correct? > > -- > Den > -- > 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
