dfs.datanode.max.transfer.threads: 默认 4096 < 2.0之前该参数为dfs.datanode.max.xcievers >dfs.datanode.max.transfer.threads: 默认 4096 <
dfs.datanode.max.transfer.threads: 默认 4096 < 2.0之前该参数为dfs.datanode.max.xcievers >dfs.datanode.max.transfer.threads: 默认 4096 <