yangzhg commented on a change in pull request #7114:
URL: https://github.com/apache/incubator-doris/pull/7114#discussion_r748954668
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File path:
fe/fe-core/src/main/java/org/apache/doris/load/routineload/KafkaProgress.java
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@@ -149,6 +149,27 @@ public void modifyOffset(List<Pair<Integer, Long>>
kafkaPartitionOffsets) throws
return pairs;
}
+ // Get the lag of each kafka partition.
+ // the `partitionIdWithLatestOffsets` is the cached latest offsets of each
partition,
+ // which is periodically updated as job is running.
+ // The latest offset saved in `partitionIdWithLatestOffsets` is the next
offset of the partition,
+ // And offset saved in `partitionIdToOffset` is the next offset to be
consumed.
+ // For example, if a partition has 4 msg with offsets: 0,1,2,3
+ // The latest offset is 4, and offset to be consumed is 2,
+ // so the lag should be (4-2=)2.
Review comment:
```suggestion
// so the lag should be 4-2=2.
```
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