Ceph » rgw

#0 RGWBucket::link (this=0x7f55c8ff68d0, op_state=..., err_msg=0x0) at rgw/rgw_bucket.cc:591
#1 0x00007f588d75dd97 in RGWBucketAdminOp::link (store=0x55fe690aabb0, op_state=..., err=0x0) at rgw/rgw_bucket.cc:1058
#2 0x00007f588d95cff3 in RGWOp_Bucket_Link::execute (this=0x7f557401c580) at rgw/rgw_rest_bucket.cc:144
#3 0x00007f588d8b2468 in process_request (store=0x55fe690aabb0, rest=0x7ffff090bf00, req=0x7f55c00175c0, client_io=0x7f55c8ff7750, olog=0x0) at rgw/rgw_process.cc:270
#4 0x000055fe66e67dd4 in RGWFCGXProcess::handle_request (this=0x55fe691852e0, r=0x7f55c00175c0) at rgw/rgw_fcgi_process.cc:119
#5 0x000055fe66e690ce in RGWProcess::RGWWQ::_process (this=0x55fe69185598, req=0x7f55c00175c0) at rgw/rgw_process.h:86
#6 0x000055fe66e6bb8d in ThreadPool::WorkQueue<RGWRequest>::_void_process (this=0x55fe69185598, p=0x7f55c00175c0, handle=...) at ./common/WorkQueue.h:282
#7 0x00007f588dd82b83 in ThreadPool::worker (this=0x55fe69185350, wt=0x7f55c0000e90) at common/WorkQueue.cc:128
#8 0x00007f588dd87013 in ThreadPool::WorkThread::entry (this=0x7f55c0000e90) at common/WorkQueue.h:445
#9 0x00007f588dd76405 in Thread::entry_wrapper (this=0x7f55c0000e90) at common/Thread.cc:87
#10 0x00007f588dd7633a in Thread::_entry_func (arg=0x7f55c0000e90) at common/Thread.cc:67
#11 0x00007f588bcd3184 in start_thread (arg=0x7f55c8ff9700) at pthread_create.c:312
#12 0x00007f588b4e637d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

I see the code requires the client to carry “bucket-id”,RESTArgs::get_string(s, "bucket-id", bucket_id, &bucket_id);
But the document did not write the bucket-id is doing what?
How can I get?

http://docs.ceph.com/docs/master/radosgw/adminops/#link-bucket