ankitsultana commented on issue #12390:
URL: https://github.com/apache/pinot/issues/12390#issuecomment-1957808371
Ah my bad, I wasn't clear in the description above. Soon after the segment
receives a DISCARD from the controller, there's a Helix disconnection. And a
few seconds later the server reconnects and is back online.
My understanding is that after Helix reconnects, the segment will show up as
OFFLINE and hence trigger the OFFLINE to ONLINE transition.
Sampled some logs which show this:
```
{"@timestamp":"2024-02-12T11:17:02.203+00:00","message":"Controller response
{\"buildTimeSec\":-1,\"isSplitCommitType\":false,\"streamPartitionMsgOffset\":null,\"offset\":-1,\"status\":\"DISCARD\"}
for http://redacted:1234/segmentConsumed?
reason=timeLimit&streamPartitionMsgOffset=368526984&instance=redacted&offset=-1&name=redacted__44__3696__20240212T1016Z&rowCount=48937&memoryUsedBytes=80637706","logger_name":"org.apache.pinot.server.realtime
.ServerSegmentCompletionProtocolHandler","thread_name":"redacted__44__3696__20240212T1016Z","level":"INFO"}
....
{"@timestamp":"2024-02-12T11:17:03.801+00:00","message":"Unable to reconnect
to ZooKeeper service, session 0x500e8e168947a76 has
expired","logger_name":"org.apache.zookeeper.ClientCnxn","thread_name":"main-SendThread(redacted:2181)","level":"WARN"}
```
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