leventov commented on a change in pull request #7838: Improve IncrementalIndex
concurrency scalability
URL: https://github.com/apache/incubator-druid/pull/7838#discussion_r295934812
##########
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)) {
+ prevDimensionData = dimensions.get();
+ dimsKeyComponents = getRowDimsKeyComponents(row, prevDimensionData);
Review comment:
As far as I understand, this line is the key for preventing a race
condition. Please add a comment emphasizing this fact and explaining what race
condition would be possible otherwise.
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