zhangyue19921010 commented on a change in pull request #10524:
URL: https://github.com/apache/druid/pull/10524#discussion_r569979916
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File path:
server/src/main/java/org/apache/druid/indexing/overlord/supervisor/Supervisor.java
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@@ -64,4 +66,18 @@ default Boolean isHealthy()
* @param checkpointMetadata metadata for the sequence to currently
checkpoint
*/
void checkpoint(int taskGroupId, DataSourceMetadata checkpointMetadata);
+
+ /**
+ * Collect maxLag, totalLag, avgLag into ArrayList<Long> lags
+ * Only support Kafka ingestion so far.
+ * @param lags , Notice : The order of values is maxLag, totalLag and avgLag.
+ */
+ void collectLag(ArrayList<Long> lags);
Review comment:
Ya, for now, we only support Kafka autoScaler. But based on
`https://github.com/apache/druid/blob/118b50195e5c2989e04e0f5290aa72cae114db39/indexing-service/src/main/java/org/apache/druid/indexing/seekablestream/supervisor/SeekableStreamSupervisor.java#L3499`.
It may be not hard to support kinesis autoscaler. And I'am glad to work on
it after this pr merged. So maybe keep the code abstract is more meaningful and
there are plenty preparation to ensure that users will not set kinesis auto
scale by accident:
1. Docs mention
2. `throw new UnsupportedOperationException("Tasks auto scaler for kinesis
is not supported yet. Please remove autoscalerConfig or set it null!");` in
`KinesisSupervisorIOConfig`
3. set `autoscalerConfig = null` when `super(xxx)` in
`KinesisSupervisorIOConfig`
Also we can't cast Supervisor to KafkaSupervisor unless add an extra
dependency `druid-kafka-indexing-service` in `indexing-service` module.
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