@InterfaceAudience.Private
  static Map<byte[], String> createFamilyBloomParamMap(Configuration conf) {
    return createFamilyConfValueMap(conf, BLOOM_PARAM_FAMILIES_CONF_KEY);
  }
Runs inside the task to deserialize column family to bloom filter param map from the
configuration.
@param conf to read the serialized values from
@return a map from column family to the the configured bloom filter param
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/HFileOutputFormat2.java