leventov commented on a change in pull request #7838: Improve IncrementalIndex
concurrency scalability
URL: https://github.com/apache/incubator-druid/pull/7838#discussion_r295935378
##########
File path:
processing/src/main/java/org/apache/druid/segment/incremental/IncrementalIndex.java
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@@ -624,46 +626,67 @@ IncrementalIndexRowResult toIncrementalIndexRow(InputRow
row)
if (row.getTimestampFromEpoch() < minTimestamp) {
throw new IAE("Cannot add row[%s] because it is below the
minTimestamp[%s]", row, DateTimes.utc(minTimestamp));
}
- final List<String> rowDimensions = row.getDimensions();
+ DimensionData prevDimensionData = this.dimensions.get();
+ RowDimsKeyComponents dimsKeyComponents = getRowDimsKeyComponents(row,
prevDimensionData);
+ DimensionData dimensionData = dimsKeyComponents.getUpdatedDimensionData();
+ while (dimensionData != null &&
!dimensions.compareAndSet(prevDimensionData, dimensionData)) {
Review comment:
It's not documented what does it mean for `dimensionData` to be null here.
Please add a Javadoc comment to `RowDimsKeyComponents`'s field.
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