hi ，In a cluster of thousands of Datanodes, the Capacity of each datanode is
not exactly the same. In this case, Datanodes with a large Capacity have more
blocks and report more blocks to FBR, which takes longer to process FBR. FBR
processing is done in a queue (dfs.namenode.blockreport.queue.size). If FBR
takes a long time to process, FBRIBRQUEUQE will pile up. Obviously, as more
data is added, FbribrQueuQE will pile up more frequently, affecting namenode
performance. Is this a problem or is there any optimization method？
