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From ramkris...@apache.org
Subject hbase git commit: HBASE-13450 - Purge RawBytescomparator from the writers and readers for HBASE-10800 (Ram)
Date Fri, 24 Apr 2015 10:43:08 GMT
Repository: hbase
Updated Branches:
  refs/heads/master e1cb405ad -> a4fa93084


HBASE-13450 - Purge RawBytescomparator from the writers and readers for
HBASE-10800 (Ram)


Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/a4fa9308
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/a4fa9308
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/a4fa9308

Branch: refs/heads/master
Commit: a4fa930843896f6c134fe9372e75e79b03611d73
Parents: e1cb405
Author: ramkrishna <ramkrishna.s.vasudevan@gmail.com>
Authored: Fri Apr 24 16:01:38 2015 +0530
Committer: ramkrishna <ramkrishna.s.vasudevan@gmail.com>
Committed: Fri Apr 24 16:01:38 2015 +0530

----------------------------------------------------------------------
 .../org/apache/hadoop/hbase/util/Bytes.java     | 61 ++++++++++++++++++++
 .../hadoop/hbase/io/hfile/FixedFileTrailer.java | 40 ++++++-------
 .../hadoop/hbase/regionserver/StoreFile.java    | 41 +++++++++----
 .../hadoop/hbase/util/BloomFilterBase.java      |  5 --
 .../hadoop/hbase/util/BloomFilterFactory.java   |  4 +-
 .../hadoop/hbase/util/ByteBloomFilter.java      |  8 ---
 .../hadoop/hbase/util/CompoundBloomFilter.java  | 19 +++---
 .../hbase/util/CompoundBloomFilterBase.java     |  6 --
 .../hbase/util/CompoundBloomFilterWriter.java   |  8 ++-
 9 files changed, 127 insertions(+), 65 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/hbase/blob/a4fa9308/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Bytes.java
----------------------------------------------------------------------
diff --git a/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Bytes.java b/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Bytes.java
index f294ec9..84c708b 100644
--- a/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Bytes.java
+++ b/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Bytes.java
@@ -2056,6 +2056,23 @@ public class Bytes implements Comparable<Bytes> {
   }
 
   /**
+   * Binary search for keys in indexes using Bytes.BYTES_RAWCOMPARATOR
+   *
+   * @param arr array of byte arrays to search for
+   * @param key the key you want to find
+   * @param offset the offset in the key you want to find
+   * @param length the length of the key
+   * @return zero-based index of the key, if the key is present in the array.
+   *         Otherwise, a value -(i + 1) such that the key is between arr[i -
+   *         1] and arr[i] non-inclusively, where i is in [0, i], if we define
+   *         arr[-1] = -Inf and arr[N] = Inf for an N-element array. The above
+   *         means that this function can return 2N + 1 different values
+   *         ranging from -(N + 1) to N - 1.
+   */
+  public static int binarySearch(byte[][] arr, byte[] key, int offset, int length) {
+    return binarySearch(arr, key, offset, length, Bytes.BYTES_RAWCOMPARATOR);
+  }
+  /**
    * Binary search for keys in indexes.
    *
    * @param arr array of byte arrays to search for
@@ -2069,9 +2086,14 @@ public class Bytes implements Comparable<Bytes> {
    *         arr[-1] = -Inf and arr[N] = Inf for an N-element array. The above
    *         means that this function can return 2N + 1 different values
    *         ranging from -(N + 1) to N - 1.
+   * @deprecated {@link Bytes#binarySearch(byte[][], byte[], int, int)}
    */
+  @Deprecated
   public static int binarySearch(byte [][]arr, byte []key, int offset,
       int length, RawComparator<?> comparator) {
+    if(comparator == null) {
+      comparator = Bytes.BYTES_RAWCOMPARATOR;
+    }
     int low = 0;
     int high = arr.length - 1;
 
@@ -2107,7 +2129,9 @@ public class Bytes implements Comparable<Bytes> {
    *         means that this function can return 2N + 1 different values
    *         ranging from -(N + 1) to N - 1.
    * @return the index of the block
+   * @deprecated Use {@link Bytes#binarySearch(byte[][], Cell, Comparator)}
    */
+  @Deprecated
   public static int binarySearch(byte[][] arr, Cell key, RawComparator<Cell> comparator)
{
     int low = 0;
     int high = arr.length - 1;
@@ -2132,6 +2156,43 @@ public class Bytes implements Comparable<Bytes> {
   }
 
   /**
+   * Binary search for keys in indexes.
+   *
+   * @param arr array of byte arrays to search for
+   * @param key the key you want to find
+   * @param comparator a comparator to compare.
+   * @return zero-based index of the key, if the key is present in the array.
+   *         Otherwise, a value -(i + 1) such that the key is between arr[i -
+   *         1] and arr[i] non-inclusively, where i is in [0, i], if we define
+   *         arr[-1] = -Inf and arr[N] = Inf for an N-element array. The above
+   *         means that this function can return 2N + 1 different values
+   *         ranging from -(N + 1) to N - 1.
+   * @return the index of the block
+   */
+  public static int binarySearch(byte[][] arr, Cell key, Comparator<Cell> comparator)
{
+    int low = 0;
+    int high = arr.length - 1;
+    KeyValue.KeyOnlyKeyValue r = new KeyValue.KeyOnlyKeyValue();
+    while (low <= high) {
+      int mid = (low+high) >>> 1;
+      // we have to compare in this order, because the comparator order
+      // has special logic when the 'left side' is a special key.
+      r.setKey(arr[mid], 0, arr[mid].length);
+      int cmp = comparator.compare(key, r);
+      // key lives above the midpoint
+      if (cmp > 0)
+        low = mid + 1;
+      // key lives below the midpoint
+      else if (cmp < 0)
+        high = mid - 1;
+      // BAM. how often does this really happen?
+      else
+        return mid;
+    }
+    return - (low+1);
+  }
+
+  /**
    * Bytewise binary increment/deincrement of long contained in byte array
    * on given amount.
    *

http://git-wip-us.apache.org/repos/asf/hbase/blob/a4fa9308/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.java
index 3dcfc9b..9ce5056 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/FixedFileTrailer.java
@@ -35,6 +35,7 @@ import org.apache.hadoop.hbase.io.compress.Compression;
 import org.apache.hadoop.hbase.protobuf.generated.HFileProtos;
 import org.apache.hadoop.hbase.util.Bytes;
 
+
 /**
  * The {@link HFile} has a fixed trailer which contains offsets to other
  * variable parts of the file. Also includes basic metadata on this file. The
@@ -107,7 +108,8 @@ public class FixedFileTrailer {
   private long lastDataBlockOffset;
 
   /** Raw key comparator class name in version 3 */
-  private String comparatorClassName = KeyValue.COMPARATOR.getLegacyKeyComparatorName();
+  // We could write the actual class name from 2.0 onwards and handle BC
+  private String comparatorClassName = KeyValue.COMPARATOR.getClass().getName();
 
   /** The encryption key */
   private byte[] encryptionKey;
@@ -200,7 +202,7 @@ public class FixedFileTrailer {
       .setNumDataIndexLevels(numDataIndexLevels)
       .setFirstDataBlockOffset(firstDataBlockOffset)
       .setLastDataBlockOffset(lastDataBlockOffset)
-      // TODO this is a classname encoded into an  HFile's trailer. We are going to need
to have 
+      // TODO this is a classname encoded into an  HFile's trailer. We are going to need
to have
       // some compat code here.
       .setComparatorClassName(comparatorClassName)
       .setCompressionCodec(compressionCodec.ordinal());
@@ -539,25 +541,17 @@ public class FixedFileTrailer {
   public void setComparatorClass(Class<? extends KVComparator> klass) {
     // Is the comparator instantiable?
     try {
-      KVComparator comp = klass.newInstance();
-
-      // HFile V2 legacy comparator class names.
-      if (KeyValue.COMPARATOR.getClass().equals(klass)) {
-        comparatorClassName = KeyValue.COMPARATOR.getLegacyKeyComparatorName();
-      } else if (KeyValue.META_COMPARATOR.getClass().equals(klass)) {
-        comparatorClassName = KeyValue.META_COMPARATOR.getLegacyKeyComparatorName();
-      } else if (KeyValue.RAW_COMPARATOR.getClass().equals(klass)) {
-        comparatorClassName = KeyValue.RAW_COMPARATOR.getLegacyKeyComparatorName();
-      } else {
-        // if the name wasn't one of the legacy names, maybe its a legit new kind of comparator.
+      // If null, it should be the Bytes.BYTES_RAWCOMPARATOR
+      if (klass != null) {
+        KVComparator comp = klass.newInstance();
+        // if the name wasn't one of the legacy names, maybe its a legit new
+        // kind of comparator.
         comparatorClassName = klass.getName();
       }
 
     } catch (Exception e) {
-      throw new RuntimeException("Comparator class " + klass.getName() +
-        " is not instantiable", e);
+      throw new RuntimeException("Comparator class " + klass.getName() + " is not instantiable",
e);
     }
-
   }
 
   @SuppressWarnings("unchecked")
@@ -570,13 +564,16 @@ public class FixedFileTrailer {
       } else if (comparatorClassName.equals(KeyValue.META_COMPARATOR.getLegacyKeyComparatorName()))
{
         comparatorClassName = KeyValue.META_COMPARATOR.getClass().getName();
       } else if (comparatorClassName.equals(KeyValue.RAW_COMPARATOR.getLegacyKeyComparatorName()))
{
-        comparatorClassName = KeyValue.RAW_COMPARATOR.getClass().getName();
+        return null;
       }
 
       // if the name wasn't one of the legacy names, maybe its a legit new kind of comparator.
-
-      return (Class<? extends KVComparator>)
-          Class.forName(comparatorClassName);
+      if (comparatorClassName.equals(KeyValue.RAW_COMPARATOR.getClass().getName())) {
+        // Return null for Bytes.BYTES_RAWCOMPARATOR
+        return null;
+      } else {
+        return (Class<? extends KVComparator>) Class.forName(comparatorClassName);
+      }
     } catch (ClassNotFoundException ex) {
       throw new IOException(ex);
     }
@@ -585,7 +582,8 @@ public class FixedFileTrailer {
   public static KVComparator createComparator(
       String comparatorClassName) throws IOException {
     try {
-      return getComparatorClass(comparatorClassName).newInstance();
+      Class<? extends KVComparator> comparatorClass = getComparatorClass(comparatorClassName);
+      return comparatorClass != null ? comparatorClass.newInstance() : null;
     } catch (InstantiationException e) {
       throw new IOException("Comparator class " + comparatorClassName +
         " is not instantiable", e);

http://git-wip-us.apache.org/repos/asf/hbase/blob/a4fa9308/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java
index 345dd9b..8cb20cd 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java
@@ -884,15 +884,22 @@ public class StoreFile {
                 " (ROW or ROWCOL expected)");
           }
           generalBloomFilterWriter.add(bloomKey, bloomKeyOffset, bloomKeyLen);
-          if (lastBloomKey != null
-              && generalBloomFilterWriter.getComparator().compareFlatKey(bloomKey,
-                  bloomKeyOffset, bloomKeyLen, lastBloomKey,
-                  lastBloomKeyOffset, lastBloomKeyLen) <= 0) {
-            throw new IOException("Non-increasing Bloom keys: "
-                + Bytes.toStringBinary(bloomKey, bloomKeyOffset, bloomKeyLen)
-                + " after "
-                + Bytes.toStringBinary(lastBloomKey, lastBloomKeyOffset,
-                    lastBloomKeyLen));
+          if (lastBloomKey != null) {
+            int res = 0;
+            // hbase:meta does not have blooms. So we need not have special interpretation
+            // of the hbase:meta cells.  We can safely use Bytes.BYTES_RAWCOMPARATOR for
ROW Bloom
+            if (bloomType == BloomType.ROW) {
+              res = Bytes.BYTES_RAWCOMPARATOR.compare(bloomKey, bloomKeyOffset, bloomKeyLen,
+                  lastBloomKey, lastBloomKeyOffset, lastBloomKeyLen);
+            } else {
+              res = KeyValue.COMPARATOR.compareFlatKey(bloomKey,
+                  bloomKeyOffset, bloomKeyLen, lastBloomKey, lastBloomKeyOffset, lastBloomKeyLen);
+            }
+            if (res <= 0) {
+              throw new IOException("Non-increasing Bloom keys: "
+                  + Bytes.toStringBinary(bloomKey, bloomKeyOffset, bloomKeyLen) + " after
"
+                  + Bytes.toStringBinary(lastBloomKey, lastBloomKeyOffset, lastBloomKeyLen));
+            }
           }
           lastBloomKey = bloomKey;
           lastBloomKeyOffset = bloomKeyOffset;
@@ -913,6 +920,8 @@ public class StoreFile {
       if (null != this.deleteFamilyBloomFilterWriter) {
         boolean newKey = true;
         if (lastDeleteFamilyCell != null) {
+          // hbase:meta does not have blooms. So we need not have special interpretation
+          // of the hbase:meta cells
           newKey = !kvComparator.matchingRows(cell, lastDeleteFamilyCell);
         }
         if (newKey) {
@@ -1280,8 +1289,16 @@ public class StoreFile {
           // Whether the primary Bloom key is greater than the last Bloom key
           // from the file info. For row-column Bloom filters this is not yet
           // a sufficient condition to return false.
-          boolean keyIsAfterLast = lastBloomKey != null
-              && bloomFilter.getComparator().compareFlatKey(key, lastBloomKey) >
0;
+          boolean keyIsAfterLast = (lastBloomKey != null);
+          // hbase:meta does not have blooms. So we need not have special interpretation
+          // of the hbase:meta cells.  We can safely use Bytes.BYTES_RAWCOMPARATOR for ROW
Bloom
+          if (keyIsAfterLast) {
+            if (bloomFilterType == BloomType.ROW) {
+              keyIsAfterLast = (Bytes.BYTES_RAWCOMPARATOR.compare(key, lastBloomKey) >
0);
+            } else {
+              keyIsAfterLast = (KeyValue.COMPARATOR.compareFlatKey(key, lastBloomKey)) >
0;
+            }
+          }
 
           if (bloomFilterType == BloomType.ROWCOL) {
             // Since a Row Delete is essentially a DeleteFamily applied to all
@@ -1292,7 +1309,7 @@ public class StoreFile {
                 null, 0, 0);
 
             if (keyIsAfterLast
-                && bloomFilter.getComparator().compareFlatKey(rowBloomKey,
+                && KeyValue.COMPARATOR.compareFlatKey(rowBloomKey,
                     lastBloomKey) > 0) {
               exists = false;
             } else {

http://git-wip-us.apache.org/repos/asf/hbase/blob/a4fa9308/hbase-server/src/main/java/org/apache/hadoop/hbase/util/BloomFilterBase.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/BloomFilterBase.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/BloomFilterBase.java
index 3b9ca9a..8198726 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/BloomFilterBase.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/BloomFilterBase.java
@@ -49,9 +49,4 @@ public interface BloomFilterBase {
   byte[] createBloomKey(byte[] rowBuf, int rowOffset, int rowLen,
       byte[] qualBuf, int qualOffset, int qualLen);
 
-  /**
-   * @return Bloom key comparator
-   */
-  KVComparator getComparator();
-
 }

http://git-wip-us.apache.org/repos/asf/hbase/blob/a4fa9308/hbase-server/src/main/java/org/apache/hadoop/hbase/util/BloomFilterFactory.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/BloomFilterFactory.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/BloomFilterFactory.java
index 5ff7207..71908ab 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/BloomFilterFactory.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/BloomFilterFactory.java
@@ -199,7 +199,7 @@ public final class BloomFilterFactory {
     // In case of compound Bloom filters we ignore the maxKeys hint.
     CompoundBloomFilterWriter bloomWriter = new CompoundBloomFilterWriter(getBloomBlockSize(conf),
         err, Hash.getHashType(conf), maxFold, cacheConf.shouldCacheBloomsOnWrite(),
-        bloomType == BloomType.ROWCOL ? KeyValue.COMPARATOR : KeyValue.RAW_COMPARATOR);
+        bloomType == BloomType.ROWCOL ? KeyValue.COMPARATOR : null);
     writer.addInlineBlockWriter(bloomWriter);
     return bloomWriter;
   }
@@ -230,7 +230,7 @@ public final class BloomFilterFactory {
     // In case of compound Bloom filters we ignore the maxKeys hint.
     CompoundBloomFilterWriter bloomWriter = new CompoundBloomFilterWriter(getBloomBlockSize(conf),
         err, Hash.getHashType(conf), maxFold, cacheConf.shouldCacheBloomsOnWrite(),
-        KeyValue.RAW_COMPARATOR);
+        null);
     writer.addInlineBlockWriter(bloomWriter);
     return bloomWriter;
   }

http://git-wip-us.apache.org/repos/asf/hbase/blob/a4fa9308/hbase-server/src/main/java/org/apache/hadoop/hbase/util/ByteBloomFilter.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/ByteBloomFilter.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/ByteBloomFilter.java
index 56c3776..8f1f652 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/ByteBloomFilter.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/ByteBloomFilter.java
@@ -27,8 +27,6 @@ import java.text.NumberFormat;
 import java.util.Random;
 
 import org.apache.hadoop.hbase.classification.InterfaceAudience;
-import org.apache.hadoop.hbase.KeyValue;
-import org.apache.hadoop.hbase.KeyValue.KVComparator;
 import org.apache.hadoop.io.Writable;
 
 /**
@@ -625,12 +623,6 @@ public class ByteBloomFilter implements BloomFilter, BloomFilterWriter
{
     return result;
   }
 
-  @Override
-  public KVComparator getComparator() {
-//    return Bytes.BYTES_RAWCOMPARATOR;
-    return KeyValue.RAW_COMPARATOR;
-  }
-
   /**
    * A human-readable string with statistics for the given Bloom filter.
    *

http://git-wip-us.apache.org/repos/asf/hbase/blob/a4fa9308/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilter.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilter.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilter.java
index beda805..ce9d2d2 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilter.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilter.java
@@ -24,7 +24,6 @@ import java.io.IOException;
 import java.nio.ByteBuffer;
 
 import org.apache.hadoop.hbase.classification.InterfaceAudience;
-import org.apache.hadoop.hbase.KeyValue.KVComparator;
 import org.apache.hadoop.hbase.io.hfile.BlockType;
 import org.apache.hadoop.hbase.io.hfile.FixedFileTrailer;
 import org.apache.hadoop.hbase.io.hfile.HFile;
@@ -70,8 +69,13 @@ public class CompoundBloomFilter extends CompoundBloomFilterBase
     totalKeyCount = meta.readLong();
     totalMaxKeys = meta.readLong();
     numChunks = meta.readInt();
-    comparator = FixedFileTrailer.createComparator(
-        Bytes.toString(Bytes.readByteArray(meta)));
+    byte[] comparatorClassName = Bytes.readByteArray(meta);
+    // The writer would have return 0 as the vint length for the case of 
+    // Bytes.BYTES_RAWCOMPARATOR.  In such cases do not initialize comparator, it can be
+    // null
+    if (comparatorClassName.length != 0) {
+      comparator = FixedFileTrailer.createComparator(Bytes.toString(comparatorClassName));
+    }
 
     hash = Hash.getInstance(hashType);
     if (hash == null) {
@@ -131,11 +135,6 @@ public class CompoundBloomFilter extends CompoundBloomFilterBase
     return numChunks;
   }
 
-  @Override
-  public KVComparator getComparator() {
-    return comparator;
-  }
-
   public void enableTestingStats() {
     numQueriesPerChunk = new long[numChunks];
     numPositivesPerChunk = new long[numChunks];
@@ -172,7 +171,9 @@ public class CompoundBloomFilter extends CompoundBloomFilterBase
     sb.append(ByteBloomFilter.STATS_RECORD_SEP + 
         "Number of chunks: " + numChunks);
     sb.append(ByteBloomFilter.STATS_RECORD_SEP + 
-        "Comparator: " + comparator.getClass().getSimpleName());
+        ((comparator != null) ? "Comparator: "
+        + comparator.getClass().getSimpleName() : "Comparator: "
+        + Bytes.BYTES_RAWCOMPARATOR.getClass().getSimpleName()));
     return sb.toString();
   }
 

http://git-wip-us.apache.org/repos/asf/hbase/blob/a4fa9308/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilterBase.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilterBase.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilterBase.java
index af9fa00..0ba46e6 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilterBase.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilterBase.java
@@ -50,7 +50,6 @@ public class CompoundBloomFilterBase implements BloomFilterBase {
 
   /** Hash function type to use, as defined in {@link Hash} */
   protected int hashType;
-  
   /** Comparator used to compare Bloom filter keys */
   protected KVComparator comparator;
 
@@ -89,9 +88,4 @@ public class CompoundBloomFilterBase implements BloomFilterBase {
     return kv.getKey();
   }
 
-  @Override
-  public KVComparator getComparator() {
-    return comparator;
-  }
-
 }

http://git-wip-us.apache.org/repos/asf/hbase/blob/a4fa9308/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilterWriter.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilterWriter.java
b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilterWriter.java
index d436a98..1cef523 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilterWriter.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/util/CompoundBloomFilterWriter.java
@@ -243,8 +243,12 @@ public class CompoundBloomFilterWriter extends CompoundBloomFilterBase
 
       // Fields that don't have equivalents in ByteBloomFilter.
       out.writeInt(numChunks);
-      Bytes.writeByteArray(out,
-          Bytes.toBytes(comparator.getClass().getName()));
+      if (comparator != null) {
+        Bytes.writeByteArray(out, Bytes.toBytes(comparator.getClass().getName()));
+      } else {
+        // Internally writes a 0 vint if the byte[] is null
+        Bytes.writeByteArray(out, null);
+      }
 
       // Write a single-level index without compression or block header.
       bloomBlockIndexWriter.writeSingleLevelIndex(out, "Bloom filter");


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