The performance of Hadoop Distributed File System(HDFS) in dealing with the problem of storing and handling large files is excellent,but the performance and efficiency is down significantly when dealing with a huge number of small files. Too many small files will lead to the high load of entire cluster. In order to improve the performance of HDFS handling small files,the double-merging algorithm is put forward based on the relationship between files and merging algorithm based on the data block balance and ...