siddharthteotia commented on code in PR #9510:
URL: https://github.com/apache/pinot/pull/9510#discussion_r995318273
##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/loader/ForwardIndexHandler.java:
##########
@@ -173,7 +168,143 @@ private void rewriteRawForwardIndex(String column,
SegmentDirectory.Writer segme
IndexCreatorProvider indexCreatorProvider)
throws Exception {
Preconditions.checkState(_segmentMetadata.getVersion() ==
SegmentVersion.v3);
+ ColumnMetadata existingColMetadata =
_segmentMetadata.getColumnMetadataFor(column);
+ boolean isSingleValue = existingColMetadata.isSingleValue();
+
+ if (isSingleValue) {
+ rewriteRawSVForwardIndex(column, segmentWriter, indexCreatorProvider);
+ } else {
+ rewriteRawMVForwardIndex(column, segmentWriter, indexCreatorProvider);
+ }
+ }
+
+ private void rewriteRawMVForwardIndex(String column, SegmentDirectory.Writer
segmentWriter,
+ IndexCreatorProvider indexCreatorProvider)
+ throws Exception {
+ ColumnMetadata existingColMetadata =
_segmentMetadata.getColumnMetadataFor(column);
+ File indexDir = _segmentMetadata.getIndexDir();
+ String segmentName = _segmentMetadata.getName();
+ File inProgress = new File(indexDir, column + ".fwd.inprogress");
+ File fwdIndexFile = new File(indexDir, column +
V1Constants.Indexes.RAW_MV_FORWARD_INDEX_FILE_EXTENSION);
+
+ if (!inProgress.exists()) {
+ // Marker file does not exist, which means last run ended normally.
+ // Create a marker file.
+ FileUtils.touch(inProgress);
+ } else {
+ // Marker file exists, which means last run was interrupted.
+ // Remove forward index if exists.
+ FileUtils.deleteQuietly(fwdIndexFile);
+ }
+
+ LOGGER.info("Creating new forward index for segment={} and column={}",
segmentName, column);
+ Map<String, ChunkCompressionType> compressionConfigs =
_indexLoadingConfig.getCompressionConfigs();
+ Preconditions.checkState(compressionConfigs.containsKey(column));
+ // At this point, compressionConfigs is guaranteed to contain the column.
+ ChunkCompressionType newCompressionType = compressionConfigs.get(column);
+
+ int numDocs = existingColMetadata.getTotalDocs();
+
+ try (ForwardIndexReader reader =
LoaderUtils.getForwardIndexReader(segmentWriter, existingColMetadata)) {
+ int lengthOfLongestEntry = reader.getLengthOfLongestEntry();
+ Preconditions.checkState(lengthOfLongestEntry >= 0,
+ "lengthOfLongestEntry cannot be negative. segment=" + segmentName +
" column={}" + column);
+ int maxNumberOfMVEntries =
existingColMetadata.getMaxNumberOfMultiValues();
+ int maxRowLengthInBytes = lengthOfLongestEntry - (Integer.BYTES *
maxNumberOfMVEntries) - Integer.BYTES;
Review Comment:
I feel this calculation should not live here because this is dependent on
the file format layout / version of the originally created raw forward index.
If the latter changes, this will fail. So I suggest moving this into a
static function inside the raw chunk forward index writer that controls the
format.
Whoever changes the format should keep the math inside the function backward
compatible
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