jpountz commented on a change in pull request #1234: Add compression for Binary
doc value fields
URL: https://github.com/apache/lucene-solr/pull/1234#discussion_r375927967
##########
File path:
lucene/core/src/java/org/apache/lucene/codecs/lucene80/Lucene80DocValuesConsumer.java
##########
@@ -353,67 +360,168 @@ private void writeBlock(long[] values, int length, long
gcd, ByteBuffersDataOutp
}
}
- @Override
- public void addBinaryField(FieldInfo field, DocValuesProducer
valuesProducer) throws IOException {
- meta.writeInt(field.number);
- meta.writeByte(Lucene80DocValuesFormat.BINARY);
-
- BinaryDocValues values = valuesProducer.getBinary(field);
- long start = data.getFilePointer();
- meta.writeLong(start); // dataOffset
- int numDocsWithField = 0;
- int minLength = Integer.MAX_VALUE;
- int maxLength = 0;
- for (int doc = values.nextDoc(); doc != DocIdSetIterator.NO_MORE_DOCS; doc
= values.nextDoc()) {
- numDocsWithField++;
- BytesRef v = values.binaryValue();
- int length = v.length;
- data.writeBytes(v.bytes, v.offset, v.length);
- minLength = Math.min(length, minLength);
- maxLength = Math.max(length, maxLength);
+ class CompressedBinaryBlockWriter implements Closeable {
+ FastCompressionHashTable ht = new LZ4.FastCompressionHashTable();
+ int uncompressedBlockLength = 0;
+ int maxUncompressedBlockLength = 0;
+ int numDocsInCurrentBlock = 0;
+ int [] docLengths = new
int[Lucene80DocValuesFormat.BINARY_DOCS_PER_COMPRESSED_BLOCK];
+ byte [] block = new byte [1024 * 16];
+ int totalChunks = 0;
+ long maxPointer = 0;
+ long blockAddressesStart = -1;
+
+ private IndexOutput tempBinaryOffsets;
+
+
+ public CompressedBinaryBlockWriter() throws IOException {
+ tempBinaryOffsets =
state.directory.createTempOutput(state.segmentInfo.name, "binary_pointers",
state.context);
+ try {
+ CodecUtil.writeHeader(tempBinaryOffsets,
Lucene80DocValuesFormat.META_CODEC + "FilePointers",
Lucene80DocValuesFormat.VERSION_CURRENT);
+ } catch (Throwable exception) {
+ IOUtils.closeWhileHandlingException(this); //self-close because
constructor caller can't
+ throw exception;
+ }
Review comment:
It was about optimizing for the case that all values have the same length.
In that case we could still one bit of the first length to mean that all values
have the same length for instance?
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