a2l007 opened a new pull request #10464:
URL: https://github.com/apache/druid/pull/10464


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   This PR separates out query timeout exceptions and avoids it from being 
thrown as a `QueryInterruptedException`. Timeout exceptions are now handled 
using a new  `QueryTimeoutException`. Timed out queries will now return HTTP 
504 status code instead of the default HTTP 500 status. This makes it easier 
for clients to identify timeout exceptions and handle it accordingly.
   To preserve  the query metrics behavior, timeout exceptions are still being 
clubbed under `query/interrupted/count`, but I feel 
   there should be a separate metric for query timeouts which can be done in a 
separate PR.
   
   Fixes #10028 
   
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   This PR has:
   - [x] been self-reviewed.
   - [x] added Javadocs for most classes and all non-trivial methods. Linked 
related entities via Javadoc links.
   - [x] added unit tests or modified existing tests to cover new code paths, 
ensuring the threshold for [code 
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
 is met.
   - [x] been tested in a test Druid cluster.
   
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   ##### Key changed/added classes in this PR
    * `QueryTimeoutException`
   


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