siddharthteotia commented on a change in pull request #7898:
URL: https://github.com/apache/pinot/pull/7898#discussion_r768291642
##########
File path:
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/indexsegment/immutable/ImmutableSegmentLoader.java
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@@ -173,6 +174,34 @@ public static ImmutableSegment load(File indexDir,
IndexLoadingConfig indexLoadi
return segment;
}
+ /**
+ * Check segment directory against the table config and schema to see if any
preprocessing is needed,
+ * like changing segment format, adding new indices or updating default
columns.
+ */
+ public static boolean needPreprocess(SegmentDirectory segmentDirectory,
IndexLoadingConfig indexLoadingConfig,
+ @Nullable Schema schema)
+ throws Exception {
+ if (needConvertSegmentFormat(indexLoadingConfig,
segmentDirectory.getSegmentMetadata())) {
+ return true;
+ }
+ SegmentPreProcessor preProcessor = new
SegmentPreProcessor(segmentDirectory, indexLoadingConfig, schema);
+ return preProcessor.needProcess();
+ }
+
+ @VisibleForTesting
+ static boolean needConvertSegmentFormat(IndexLoadingConfig
indexLoadingConfig,
+ SegmentMetadataImpl segmentMetadata) {
+ SegmentVersion segmentVersionToLoad =
indexLoadingConfig.getSegmentVersion();
+ if (segmentVersionToLoad == null) {
+ return false;
+ }
+ File indexDir = segmentMetadata.getIndexDir();
+ if (indexDir != null &&
SegmentDirectoryPaths.segmentDirectoryFor(indexDir,
segmentVersionToLoad).isDirectory()) {
+ return false;
+ }
+ return segmentVersionToLoad != segmentMetadata.getVersion();
Review comment:
Can we make downConversion as NO-OP or throw exception like it does in
the actual preprocess code ?
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