ocadaruma commented on code in PR #14289:
URL: https://github.com/apache/kafka/pull/14289#discussion_r1493877586
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clients/src/main/java/org/apache/kafka/common/record/FileRecords.java:
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@@ -421,6 +446,18 @@ private AbstractIterator<FileChannelRecordBatch>
batchIterator(int start) {
return new RecordBatchIterator<>(inputStream);
}
+ /**
+ * Try populating OS page cache with file content
+ */
+ public void prepareForRead() throws IOException {
+ if (DEVNULL_PATH != null) {
+ long size = Math.min(channel.size(), end) - start;
+ try (FileChannel devnullChannel = FileChannel.open(DEVNULL_PATH,
StandardOpenOption.WRITE)) {
+ channel.transferTo(start, size, devnullChannel);
Review Comment:
> do we want to pre-populate the entire content represented by the
FileRecords
Given that FileRecords here represents a slice of the file adjusted to
fetch-size, we want to pre-populate the entire content here because even the
single `writeTo` might read only smaller part, network-thread anyways needs
entire content.
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