imply-cheddar commented on code in PR #16700:
URL: https://github.com/apache/druid/pull/16700#discussion_r1705698776
##########
processing/src/main/java/org/apache/druid/segment/IndexIO.java:
##########
@@ -663,9 +650,32 @@ public QueryableIndex load(File inDir, ObjectMapper
mapper, boolean lazy, Segmen
segmentBitmapSerdeFactory.getBitmapFactory(),
columns,
smooshedFiles,
- metadata,
lazy
- );
+ )
+ {
+ @Override
+ public Metadata getMetadata()
+ {
+ try {
+ ByteBuffer metadataBB = smooshedFiles.mapFile("metadata.drd");
Review Comment:
Not necessarily. The smooshedFiles is memory mapped and this is returning a
memoized memory-mapped buffer. It will do some less than fast operations, but
not necessarily brand new disk IO. The getMetadata() call is used seldom (only
a few specific introspection-oriented calls like the segmentMetadata query) so
it's better to have it be lazy and not consume on-heap memory.
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