private boolean mobArchiveExist(TableName tn, String familyName, String fileName)
    throws IOException {
    FileSystem fs = TEST_UTIL.getTestFileSystem();
    Path storePath = HFileArchiveUtil.getStoreArchivePath(TEST_UTIL.getConfiguration(), tn,
      MobUtils.getMobRegionInfo(tn).getEncodedName(), familyName);
    return fs.exists(new Path(storePath, fileName));
  }
Generate the mob value. the size of the value
@return the mob value generated
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestDeleteMobTable.java