private long hashFileName(String fileName) {
    return Hashing.murmur3_128().hashString(fileName, java.nio.charset.StandardCharsets.UTF_8)
      .asLong();
  }
Use murmurhash to reduce the conflicts of hashed file names. We should notice that the hash
conflicts may bring deadlocks, when opening mob files with evicting some other files, as
described in HBASE-28047.
hbase-server/src/main/java/org/apache/hadoop/hbase/mob/MobFileCache.java