[SPARK-12938][SQL] DataFrame API for Bloom filter

This PR integrates Bloom filter from spark-sketch into DataFrame. This version resorts to RDD.aggregate for building the filter. A more performant UDAF version can be built in future follow-up PRs. This PR also add 2 specify `put` version(`putBinary` and `putLong`) into `BloomFilter`, which makes it easier to build a Bloom filter over a `DataFrame`. Author: Wenchen Fan <[email protected]> Closes apache#10937 from cloud-fan/bloom-filter.
bvkkr2808 · Jan 27, 2016 · 680afab · 680afab
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diff --git a/common/sketch/src/main/java/org/apache/spark/util/sketch/BloomFilter.java b/common/sketch/src/main/java/org/apache/spark/util/sketch/BloomFilter.java
@@ -49,9 +49,9 @@ public enum Version {
      * {@code BloomFilter} binary format version 1 (all values written in big-endian order):
      * <ul>
      *   <li>Version number, always 1 (32 bit)</li>
+     *   <li>Number of hash functions (32 bit)</li>
      *   <li>Total number of words of the underlying bit array (32 bit)</li>
      *   <li>The words/longs (numWords * 64 bit)</li>
-     *   <li>Number of hash functions (32 bit)</li>
      * </ul>
      */
     V1(1);
@@ -97,6 +97,21 @@ int getVersionNumber() {
    */
   public abstract boolean put(Object item);
 
+  /**
+   * A specialized variant of {@link #put(Object)}, that can only be used to put utf-8 string.
+   */
+  public abstract boolean putString(String str);
+
+  /**
+   * A specialized variant of {@link #put(Object)}, that can only be used to put long.
+   */
+  public abstract boolean putLong(long l);
+
+  /**
+   * A specialized variant of {@link #put(Object)}, that can only be used to put byte array.
+   */
+  public abstract boolean putBinary(byte[] bytes);
+
   /**
    * Determines whether a given bloom filter is compatible with this bloom filter. For two
    * bloom filters to be compatible, they must have the same bit size.
@@ -121,6 +136,23 @@ int getVersionNumber() {
    */
   public abstract boolean mightContain(Object item);
 
+  /**
+   * A specialized variant of {@link #mightContain(Object)}, that can only be used to test utf-8
+   * string.
+   */
+  public abstract boolean mightContainString(String str);
+
+  /**
+   * A specialized variant of {@link #mightContain(Object)}, that can only be used to test long.
+   */
+  public abstract boolean mightContainLong(long l);
+
+  /**
+   * A specialized variant of {@link #mightContain(Object)}, that can only be used to test byte
+   * array.
+   */
+  public abstract boolean mightContainBinary(byte[] bytes);
+
   /**
    * Writes out this {@link BloomFilter} to an output stream in binary format.
    * It is the caller's responsibility to close the stream.

diff --git a/common/sketch/src/main/java/org/apache/spark/util/sketch/BloomFilterImpl.java b/common/sketch/src/main/java/org/apache/spark/util/sketch/BloomFilterImpl.java
@@ -19,10 +19,10 @@
 
 import java.io.*;
 
-public class BloomFilterImpl extends BloomFilter {
+public class BloomFilterImpl extends BloomFilter implements Serializable {
 
-  private final int numHashFunctions;
-  private final BitArray bits;
+  private int numHashFunctions;
+  private BitArray bits;
 
   BloomFilterImpl(int numHashFunctions, long numBits) {
     this(new BitArray(numBits), numHashFunctions);
@@ -33,6 +33,8 @@ private BloomFilterImpl(BitArray bits, int numHashFunctions) {
     this.numHashFunctions = numHashFunctions;
   }
 
+  private BloomFilterImpl() {}
+
   @Override
   public boolean equals(Object other) {
     if (other == this) {
@@ -63,55 +65,75 @@ public long bitSize() {
     return bits.bitSize();
   }
 
-  private static long hashObjectToLong(Object item) {
+  @Override
+  public boolean put(Object item) {
     if (item instanceof String) {
-      try {
-        byte[] bytes = ((String) item).getBytes("utf-8");
-        return hashBytesToLong(bytes);
-      } catch (UnsupportedEncodingException e) {
-        throw new RuntimeException("Only support utf-8 string", e);
-      }
+      return putString((String) item);
+    } else if (item instanceof byte[]) {
+      return putBinary((byte[]) item);
     } else {
-      long longValue;
-
-      if (item instanceof Long) {
-        longValue = (Long) item;
-      } else if (item instanceof Integer) {
-        longValue = ((Integer) item).longValue();
-      } else if (item instanceof Short) {
-        longValue = ((Short) item).longValue();
-      } else if (item instanceof Byte) {
-        longValue = ((Byte) item).longValue();
-      } else {
-        throw new IllegalArgumentException(
-          "Support for " + item.getClass().getName() + " not implemented"
-        );
-      }
-
-      int h1 = Murmur3_x86_32.hashLong(longValue, 0);
-      int h2 = Murmur3_x86_32.hashLong(longValue, h1);
-      return (((long) h1) << 32) | (h2 & 0xFFFFFFFFL);
+      return putLong(Utils.integralToLong(item));
     }
   }
 
-  private static long hashBytesToLong(byte[] bytes) {
+  @Override
+  public boolean putString(String str) {
+    return putBinary(Utils.getBytesFromUTF8String(str));
+  }
+
+  @Override
+  public boolean putBinary(byte[] bytes) {
     int h1 = Murmur3_x86_32.hashUnsafeBytes(bytes, Platform.BYTE_ARRAY_OFFSET, bytes.length, 0);
     int h2 = Murmur3_x86_32.hashUnsafeBytes(bytes, Platform.BYTE_ARRAY_OFFSET, bytes.length, h1);
-    return (((long) h1) << 32) | (h2 & 0xFFFFFFFFL);
+
+    long bitSize = bits.bitSize();
+    boolean bitsChanged = false;
+    for (int i = 1; i <= numHashFunctions; i++) {
+      int combinedHash = h1 + (i * h2);
+      // Flip all the bits if it's negative (guaranteed positive number)
+      if (combinedHash < 0) {
+        combinedHash = ~combinedHash;
+      }
+      bitsChanged |= bits.set(combinedHash % bitSize);
+    }
+    return bitsChanged;
   }
 
   @Override
-  public boolean put(Object item) {
+  public boolean mightContainString(String str) {
+    return mightContainBinary(Utils.getBytesFromUTF8String(str));
+  }
+
+  @Override
+  public boolean mightContainBinary(byte[] bytes) {
+    int h1 = Murmur3_x86_32.hashUnsafeBytes(bytes, Platform.BYTE_ARRAY_OFFSET, bytes.length, 0);
+    int h2 = Murmur3_x86_32.hashUnsafeBytes(bytes, Platform.BYTE_ARRAY_OFFSET, bytes.length, h1);
+
     long bitSize = bits.bitSize();
+    for (int i = 1; i <= numHashFunctions; i++) {
+      int combinedHash = h1 + (i * h2);
+      // Flip all the bits if it's negative (guaranteed positive number)
+      if (combinedHash < 0) {
+        combinedHash = ~combinedHash;
+      }
+      if (!bits.get(combinedHash % bitSize)) {
+        return false;
+      }
+    }
+    return true;
+  }
 
-    // Here we first hash the input element into 2 int hash values, h1 and h2, then produce n hash
-    // values by `h1 + i * h2` with 1 <= i <= numHashFunctions.
-    // Note that `CountMinSketch` use a different strategy for long type, it hash the input long
-    // element with every i to produce n hash values.
-    long hash64 = hashObjectToLong(item);
-    int h1 = (int) (hash64 >> 32);
-    int h2 = (int) hash64;
+  @Override
+  public boolean putLong(long l) {
+    // Here we first hash the input long element into 2 int hash values, h1 and h2, then produce n
+    // hash values by `h1 + i * h2` with 1 <= i <= numHashFunctions.
+    // Note that `CountMinSketch` use a different strategy, it hash the input long element with
+    // every i to produce n hash values.
+    // TODO: the strategy of `CountMinSketch` looks more advanced, should we follow it here?
+    int h1 = Murmur3_x86_32.hashLong(l, 0);
+    int h2 = Murmur3_x86_32.hashLong(l, h1);
 
+    long bitSize = bits.bitSize();
     boolean bitsChanged = false;
     for (int i = 1; i <= numHashFunctions; i++) {
       int combinedHash = h1 + (i * h2);
@@ -125,12 +147,11 @@ public boolean put(Object item) {
   }
 
   @Override
-  public boolean mightContain(Object item) {
-    long bitSize = bits.bitSize();
-    long hash64 = hashObjectToLong(item);
-    int h1 = (int) (hash64 >> 32);
-    int h2 = (int) hash64;
+  public boolean mightContainLong(long l) {
+    int h1 = Murmur3_x86_32.hashLong(l, 0);
+    int h2 = Murmur3_x86_32.hashLong(l, h1);
 
+    long bitSize = bits.bitSize();
     for (int i = 1; i <= numHashFunctions; i++) {
       int combinedHash = h1 + (i * h2);
       // Flip all the bits if it's negative (guaranteed positive number)
@@ -144,6 +165,17 @@ public boolean mightContain(Object item) {
     return true;
   }
 
+  @Override
+  public boolean mightContain(Object item) {
+    if (item instanceof String) {
+      return mightContainString((String) item);
+    } else if (item instanceof byte[]) {
+      return mightContainBinary((byte[]) item);
+    } else {
+      return mightContainLong(Utils.integralToLong(item));
+    }
+  }
+
   @Override
   public boolean isCompatible(BloomFilter other) {
     if (other == null) {
@@ -191,18 +223,33 @@ public void writeTo(OutputStream out) throws IOException {
     DataOutputStream dos = new DataOutputStream(out);
 
     dos.writeInt(Version.V1.getVersionNumber());
-    bits.writeTo(dos);
     dos.writeInt(numHashFunctions);
+    bits.writeTo(dos);
   }
 
-  public static BloomFilterImpl readFrom(InputStream in) throws IOException {
+  private void readFrom0(InputStream in) throws IOException {
     DataInputStream dis = new DataInputStream(in);
 
     int version = dis.readInt();
     if (version != Version.V1.getVersionNumber()) {
       throw new IOException("Unexpected Bloom filter version number (" + version + ")");
     }
 
-    return new BloomFilterImpl(BitArray.readFrom(dis), dis.readInt());
+    this.numHashFunctions = dis.readInt();
+    this.bits = BitArray.readFrom(dis);
+  }
+
+  public static BloomFilterImpl readFrom(InputStream in) throws IOException {
+    BloomFilterImpl filter = new BloomFilterImpl();
+    filter.readFrom0(in);
+    return filter;
+  }
+
+  private void writeObject(ObjectOutputStream out) throws IOException {
+    writeTo(out);
+  }
+
+  private void readObject(ObjectInputStream in) throws IOException {
+    readFrom0(in);
   }
 }
diff --git a/common/sketch/src/main/java/org/apache/spark/util/sketch/CountMinSketchImpl.java b/common/sketch/src/main/java/org/apache/spark/util/sketch/CountMinSketchImpl.java
@@ -40,8 +40,7 @@ class CountMinSketchImpl extends CountMinSketch implements Serializable {
   private double eps;
   private double confidence;
 
-  private CountMinSketchImpl() {
-  }
+  private CountMinSketchImpl() {}
 
   CountMinSketchImpl(int depth, int width, int seed) {
     this.depth = depth;
@@ -143,23 +142,7 @@ public void add(Object item, long count) {
     if (item instanceof String) {
       addString((String) item, count);
     } else {
-      long longValue;
-
-      if (item instanceof Long) {
-        longValue = (Long) item;
-      } else if (item instanceof Integer) {
-        longValue = ((Integer) item).longValue();
-      } else if (item instanceof Short) {
-        longValue = ((Short) item).longValue();
-      } else if (item instanceof Byte) {
-        longValue = ((Byte) item).longValue();
-      } else {
-        throw new IllegalArgumentException(
-          "Support for " + item.getClass().getName() + " not implemented"
-        );
-      }
-
-      addLong(longValue, count);
+      addLong(Utils.integralToLong(item), count);
     }
   }
 
@@ -201,13 +184,7 @@ private int hash(long item, int count) {
   }
 
   private static int[] getHashBuckets(String key, int hashCount, int max) {
-    byte[] b;
-    try {
-      b = key.getBytes("UTF-8");
-    } catch (UnsupportedEncodingException e) {
-      throw new RuntimeException(e);
-    }
-    return getHashBuckets(b, hashCount, max);
+    return getHashBuckets(Utils.getBytesFromUTF8String(key), hashCount, max);
   }
 
   private static int[] getHashBuckets(byte[] b, int hashCount, int max) {
@@ -225,23 +202,7 @@ public long estimateCount(Object item) {
     if (item instanceof String) {
       return estimateCountForStringItem((String) item);
     } else {
-      long longValue;
-
-      if (item instanceof Long) {
-        longValue = (Long) item;
-      } else if (item instanceof Integer) {
-        longValue = ((Integer) item).longValue();
-      } else if (item instanceof Short) {
-        longValue = ((Short) item).longValue();
-      } else if (item instanceof Byte) {
-        longValue = ((Byte) item).longValue();
-      } else {
-        throw new IllegalArgumentException(
-            "Support for " + item.getClass().getName() + " not implemented"
-        );
-      }
-
-      return estimateCountForLongItem(longValue);
+      return estimateCountForLongItem(Utils.integralToLong(item));
     }
   }
 

diff --git a/common/sketch/src/main/java/org/apache/spark/util/sketch/Utils.java b/common/sketch/src/main/java/org/apache/spark/util/sketch/Utils.java
@@ -0,0 +1,48 @@
+/*
+ * 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.
+ */
+
+package org.apache.spark.util.sketch;
+
+import java.io.UnsupportedEncodingException;
+
+public class Utils {
+  public static byte[] getBytesFromUTF8String(String str) {
+    try {
+      return str.getBytes("utf-8");
+    } catch (UnsupportedEncodingException e) {
+      throw new IllegalArgumentException("Only support utf-8 string", e);
+    }
+  }
+
+  public static long integralToLong(Object i) {
+    long longValue;
+
+    if (i instanceof Long) {
+      longValue = (Long) i;
+    } else if (i instanceof Integer) {
+      longValue = ((Integer) i).longValue();
+    } else if (i instanceof Short) {
+      longValue = ((Short) i).longValue();
+    } else if (i instanceof Byte) {
+      longValue = ((Byte) i).longValue();
+    } else {
+      throw new IllegalArgumentException("Unsupported data type " + i.getClass().getName());
+    }
+
+    return longValue;
+  }
+}