siddharthteotia commented on a change in pull request #7930:
URL: https://github.com/apache/pinot/pull/7930#discussion_r772666710
##########
File path:
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/io/writer/impl/BaseChunkSVForwardIndexWriter.java
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@@ -74,15 +71,13 @@ protected BaseChunkSVForwardIndexWriter(File file,
ChunkCompressionType compress
int numDocsPerChunk, int chunkSize, int sizeOfEntry, int version)
throws IOException {
Preconditions.checkArgument(version == DEFAULT_VERSION || version ==
CURRENT_VERSION);
- _file = file;
- _headerEntryChunkOffsetSize = getHeaderEntryChunkOffsetSize(version);
- _dataOffset = headerSize(totalDocs, numDocsPerChunk,
_headerEntryChunkOffsetSize);
_chunkSize = chunkSize;
_chunkCompressor = ChunkCompressorFactory.getCompressor(compressionType);
+ _headerEntryChunkOffsetSize = getHeaderEntryChunkOffsetSize(version);
+ _dataOffset = writeHeader(compressionType, totalDocs, numDocsPerChunk,
sizeOfEntry, version);
_chunkBuffer = ByteBuffer.allocateDirect(chunkSize);
- _dataChannel = new RandomAccessFile(file, "rw").getChannel();
- _header = _dataChannel.map(FileChannel.MapMode.READ_WRITE, 0, _dataOffset);
- writeHeader(compressionType, totalDocs, numDocsPerChunk, sizeOfEntry,
version);
+ _compressedBuffer = ByteBuffer.allocateDirect(chunkSize * 2);
Review comment:
I suggest making a change to use these if we really want to do better
than 2x. Until then, we should switch back to old behavior of using 2x buffer
size since it has stood the test of time and we know it works IMHO.
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