public ExcludeDatanodeManager getExcludeDatanodeManager() {
    return excludeDatanodeManager;
  }
Check if the packet process time shows that the relevant datanode is a slow node.
@param datanodeInfo     the datanode that processed the packet
@param packetDataLen    the data length of the packet (in bytes)
@param processTimeMs    the process time (in ms) of the packet on the datanode,
@param lastAckTimestamp the last acked timestamp of the packet on another datanode
@param unfinished       if the packet is unfinished flushed to the datanode replicas
hbase-asyncfs/src/main/java/org/apache/hadoop/hbase/io/asyncfs/monitor/StreamSlowMonitor.java