I just checked with 2.6 version, and apparently Ambari Files View always makes use of the blocksize and replication parameters when posting WebHDFS REST API queries. Unless you specify your own values, it pastes default ones available in some .json configuration files in the Ambari installation directory. Actually, these Ambari default values happen to be exactly the same as Hadoop default configuration values (replication 3 blocks, block size 128 MB), so it might be misleading in respect of the issue. Should you specify your own values, you can provide them in the Files Settings / View Configs pane. Below config is mine: 2 MB block size, 2-block replica.
... View more