markharwood 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_r375922373
##########
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:
What was the "+1" comment for line 407 about?
I've seen encoding elsewhere that have n+1 offsets to record start of each
value and the last offset is effectively the end of the last value. In this
scenario I'm writing n value lengths.
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