mcvsubbu commented on a change in pull request #6031:
URL: https://github.com/apache/incubator-pinot/pull/6031#discussion_r491192719
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File path:
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/realtime/PinotLLCRealtimeSegmentManager.java
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@@ -569,13 +576,44 @@ private SegmentPartitionMetadata
getPartitionMetadataFromTableConfig(TableConfig
for (Map.Entry<String, ColumnPartitionConfig> entry :
partitionConfig.getColumnPartitionMap().entrySet()) {
String columnName = entry.getKey();
ColumnPartitionConfig columnPartitionConfig = entry.getValue();
+
+ // NOTE: Here we compare the number of partitions from the config and
the stream, and log a warning when they
+ // don't match, but use the one from the stream. The mismatch
could happen when the stream partitions are
+ // changed, but the table config has not been updated to reflect
the change. In such case, picking the
+ // number of partitions from the stream can keep the segment
properly partitioned as long as the partition
+ // function is not changed.
+ if (columnPartitionConfig.getNumPartitions() != numPartitions) {
Review comment:
For realtime table, maybe we should not have the num partitions in the
tableconfig. It can be set to -1, to indicate that it needs to come from the
stream.
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