protected List<HStoreFile> createStoreFileList(final int[] fs) {
    List<HStoreFile> storeFiles = new LinkedList<>();
    for (int fileSize : fs) {
      storeFiles.add(createMockStoreFile(fileSize));
    }
    return storeFiles;
  }
How many chars long the store file name will be.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/compactions/MockStoreFileGenerator.java