private UUID getRandomUUID(UUID oldUUID) {
    UUID newUUID = oldUUID;
    while (newUUID == oldUUID) {
      newUUID = UUID.randomUUID();
    }
    return newUUID;
  }
Generate random {@link UUID} different from {@code oldUUID}
@param oldUUID the new {@link UUID} generated that should be different from this {@link UUID}
@return the newly generated random {@link UUID}
ambry-store/src/test/java/com/github/ambry/store/StoreFindTokenTest.java