String ssName = "snapshot1";
dfs.allowSnapshot(pathDirectoryMkdir);
dfs.createSnapshot(pathDirectoryMkdir, ssName);
// OP_RENAME_SNAPSHOT 28
String ssNewName = "snapshot2";
dfs.renameSnapshot(pathDirectoryMkdir, ssName, ssNewName);
// OP_DELETE_SNAPSHOT 27
dfs.deleteSnapshot(pathDirectoryMkdir, ssNewName);
// OP_SET_REPLICATION 4
s = dfs.create(pathFileCreate);
s.close();