pzhdfy commented on a change in pull request #6988: [Improvement] historical
fast restart by lazy load columns metadata(20X faster)
URL: https://github.com/apache/incubator-druid/pull/6988#discussion_r351275292
##########
File path: processing/src/main/java/org/apache/druid/segment/IndexIO.java
##########
@@ -449,59 +455,71 @@ public QueryableIndex load(File inDir, ObjectMapper
mapper) throws IOException
if (index.getSpatialIndexes().get(dimension) != null) {
builder.setSpatialIndex(new
SpatialIndexColumnPartSupplier(index.getSpatialIndexes().get(dimension)));
}
- columns.put(
- dimension,
- builder.build()
- );
+ if (lazy) {
+ columns.put(dimension, Suppliers.memoize(() -> builder.build()));
+ } else {
+ ColumnHolder columnHolder = builder.build();
+ columns.put(dimension, () -> columnHolder);
+ }
Review comment:
done
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