[HUDI-106] Adding support for DynamicBloomFilter (#976)

- Introduced configs for bloom filter type
- Implemented dynamic bloom filter with configurable max number of keys
- BloomFilterFactory abstractions; Defaults to current simple bloom filter

LICENSE

@@ -293,3 +293,31 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 
 -------------------------------------------------------------------------------
+
+This product includes code from org.apache.hadoop.
+
+* org.apache.hudi.common.bloom.filter.InternalDynamicBloomFilter.java adapted from org.apache.hadoop.util.bloom.DynamicBloomFilter.java
+
+* org.apache.hudi.common.bloom.filter.InternalFilter copied from classes in org.apache.hadoop.util.bloom package
+
+with the following license
+
+Copyright (c) 2005, European Commission project OneLab under contract 034819 (http://www.one-lab.org)
+
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+      http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+ -------------------------------------------------------------------------------