sirianni opened a new issue #10028:
URL: https://github.com/apache/druid/issues/10028
### Affected Version
`0.17.0`
### Description
#### Expected Behavior
When a Druid query hits the `timeout` set in the query context, a consistent
error response should be returned, ideally with an `HTTP 504` error code.
#### Actual Behavior
In practice, we see several different responses returned for this scenario,
all with an `HTTP 500` error code. This makes it difficult to detect and
handle the error in client code.
```json
{
"error": "Unknown exception",
"errorMessage": "Sequence iterator timed out waiting for data",
"errorClass": "org.apache.druid.java.util.common.RE",
"host": null
}
```
```json
{
"error": "Unknown exception",
"errorMessage": "Query[3e115fa5-abf6-4496-8632-2b0196300e7c]
url[http://druid-prod-middle-manager-38.druid-prod-middle-manager.druid-prod.svc.cluster.local:8100/druid/v2/]
timed out.",
"errorClass": "org.apache.druid.java.util.common.RE",
"host": null
}
```
```json
{
"error": "Unknown exception",
"errorMessage": "Query[8245c738-799b-4901-8d00-6a64e1e55b81]
url[http://druid-prod-historical-23.druid-prod-historical.druid-prod.svc.cluster.local:8083/druid/v2/]
timed out.",
"errorClass": "org.apache.druid.java.util.common.RE",
"host": null
}
```
```json
{
"error": "Query timeout",
"errorMessage": "Timeout waiting for task.",
"errorClass": "java.util.concurrent.TimeoutException",
"host":
"druid-prod-historical-0.druid-prod-historical.druid-prod.svc.cluster.local:8083"
}
```
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