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Reduce ArrayUtil#grow in decompress (#12996)

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Zhang Chao 2024-02-26 04:09:48 +08:00 committed by GitHub
parent 47021ae98f
commit ca06693a16
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2 changed files with 5 additions and 1 deletions
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2
lucene/CHANGES.txt
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@ -198,6 +198,8 @@ Improvements
Optimizations Optimizations
--------------------- ---------------------
* GITHUB#12996: Reduce ArrayUtil#grow in decompress. (Zhang Chao)
* GITHUB#13115: Short circuit queued flush check when flush on update is disabled (Prabhat Sharma) * GITHUB#13115: Short circuit queued flush check when flush on update is disabled (Prabhat Sharma)
* GITHUB#13085: Remove unnecessary toString() / substring() calls to save some String allocations (Dmitry Cherniachenko) * GITHUB#13085: Remove unnecessary toString() / substring() calls to save some String allocations (Dmitry Cherniachenko)

4
lucene/core/src/java/org/apache/lucene/codecs/lucene90/LZ4WithPresetDictCompressionMode.java
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@ -128,10 +128,12 @@ public final class LZ4WithPresetDictCompressionMode extends CompressionMode {
} }
// Read blocks that intersect with the interval we need // Read blocks that intersect with the interval we need
if (offsetInBlock < offset + length) {
bytes.bytes = ArrayUtil.grow(bytes.bytes, bytes.length + offset + length - offsetInBlock);
}
while (offsetInBlock < offset + length) { while (offsetInBlock < offset + length) {
final int bytesToDecompress = Math.min(blockLength, offset + length - offsetInBlock); final int bytesToDecompress = Math.min(blockLength, offset + length - offsetInBlock);
LZ4.decompress(in, bytesToDecompress, buffer, dictLength); LZ4.decompress(in, bytesToDecompress, buffer, dictLength);
bytes.bytes = ArrayUtil.grow(bytes.bytes, bytes.length + bytesToDecompress);
System.arraycopy(buffer, dictLength, bytes.bytes, bytes.length, bytesToDecompress); System.arraycopy(buffer, dictLength, bytes.bytes, bytes.length, bytesToDecompress);
bytes.length += bytesToDecompress; bytes.length += bytesToDecompress;
offsetInBlock += blockLength; offsetInBlock += blockLength;