                   Value: { S: item.doc.S }
             snapshots_rw_queue.push((c) ->
               db.deleteItem(request, c)
-            , cb)
+            , 'delete Snapshot('+item.doc.S+'-'+item.v.N+')', cb)
           (error, result)->
             if error?
               cb(error, null)

      task(callback)
    , concurrency)

  push: (fn, callback) =>
    start = new Date().getTime()
    @queue.push(fn, (error, results) =>
      if @timing
        elapsed = new Date().getTime() - start
        console.log('S3['+elapsed+'ms] '+@name)

      callback(error, results)
    )

                  Value: { S: item.doc.S }
            operations_rw_queue.push((c) ->
              db.deleteItem(request, c)
            , 'delete Operation('+item.doc.S+'-'+item.v.N+')', cb)
          (error)->
            if error?
              cb(error, null)
