suddendust opened a new pull request, #12522:
URL: https://github.com/apache/pinot/pull/12522
This PR adds two metrics in `RealtimeSegmentDataManager`:
1. `REALTIME_LAST_FETCHED_BATCH_SIZE`: This is a new gauge that can assume
the following values:
- 0: When there were no messages in the last batch. This can happen when
there are no messages or very low vol of messages in the stream partition.
- 0: When messages were fetched in the last batch.
- -1: When there were exceptions fetching the message batch from the stream
partition.
This metric can be used to identify the 1st case of no messages as:
`sum by (table) (pinot_server_realtimeLastFetchedBatchSizeCount{}) == 0`. We
can use this source alert to inhibit other alerts. For example, an alert on
realtime ingestion stopped.
**Why can't we reuse `pinot_server_realtimeRowsConsumed`?**
`pinot_server_realtimeRowsConsumed` tracks the number of rows that were
successfully indexed. If there were problems transforming/indexing the row,
those rows aren't counted in this. So it makes it hard to calculate the total
number of rows being fetched from the partition stream.
3. `STREAM_CONSUMER_CREATE_EXCEPTIONS`: If we face exceptions trying to
create a stream consumer.
Testing:
`STREAM_CONSUMER_CREATE_EXCEPTIONS`:
<img width="1225" alt="Screenshot 2024-02-29 at 12 30 43 PM"
src="https://github.com/apache/pinot/assets/84911643/f9427cfc-85ac-43c4-a40c-b33bd7a88198";>
`REALTIME_ROWS_FETCHED`:
<img width="1639" alt="Screenshot 2024-02-29 at 1 34 11 PM"
src="https://github.com/apache/pinot/assets/84911643/5fb3020e-f5df-4272-87cc-fb85d5842e4a";>
<img width="1510" alt="Screenshot 2024-02-29 at 12 35 19 PM"
src="https://github.com/apache/pinot/assets/84911643/fa636fcf-e665-479f-8344-09237f20054c";>
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