/// <exception cref="System.IO.IOException"/>
        public override BatchedRemoteIterator.BatchedEntries <CachePoolEntry> MakeRequest(
            string prevKey)
        {
            TraceScope scope = Trace.StartSpan("listCachePools", traceSampler);

            try
            {
                return(namenode.ListCachePools(prevKey));
            }
            finally
            {
                scope.Close();
            }
        }