jrwest commented on code in PR #3606:
URL: https://github.com/apache/cassandra/pull/3606#discussion_r1811788867
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src/java/org/apache/cassandra/io/util/CompressedChunkReader.java:
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@@ -83,20 +89,38 @@ public BufferType preferredBufferType()
}
@Override
- public Rebufferer instantiateRebufferer()
+ public Rebufferer instantiateRebufferer(boolean isScan)
{
- return new BufferManagingRebufferer.Aligned(this);
+ return new BufferManagingRebufferer.Aligned(this.setMode(isScan));
}
public static class Standard extends CompressedChunkReader
{
// we read the raw compressed bytes into this buffer, then
uncompressed them into the provided one.
private final ThreadLocalByteBufferHolder bufferHolder;
+ private final ThreadLocalReadAheadBuffer readAheadBuffer;
+
public Standard(ChannelProxy channel, CompressionMetadata metadata,
Supplier<Double> crcCheckChanceSupplier)
{
super(channel, metadata, crcCheckChanceSupplier);
bufferHolder = new
ThreadLocalByteBufferHolder(metadata.compressor().preferredBufferType());
+
+ int readAheadBufferSize =
DatabaseDescriptor.getCompressedReadAheadBufferSize();
+ readAheadBuffer = readAheadBufferSize > 0 ? new
ThreadLocalReadAheadBuffer(channel, readAheadBufferSize,
metadata.compressor().preferredBufferType()) : null;
+ }
+
+ @Override
+ public CompressedChunkReader setMode(boolean isScan)
Review Comment:
How strongly do you feel about this? I would have to plumb it through
several layers (up to `RebuffererFactory`)
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