pranavbhole opened a new pull request, #15501:
URL: https://github.com/apache/druid/pull/15501
### Description
After updating avatica client, it mandatory to set transparent_reconnection
flag in jdbc uri to make sure that client does reconnect, ideally we should be
see no such connection only from connectionSync request, if client is not
setting flag then we see it from prepare phase itself that seems like a gap.
This PR prints associated sql if it fails from prepare or prepareAndExecute
avatica calls. It can help to trace the origin of client and fix it.
```
org.apache.calcite.avatica.NoSuchConnectionException: null
at
org.apache.druid.sql.avatica.DruidMeta.getDruidConnection(DruidMeta.java:845)
~[druid-sql.jar]
at org.apache.druid.sql.avatica.DruidMeta.prepare(DruidMeta.java:274)
~[druid-sql.jar]
at
org.apache.calcite.avatica.remote.LocalService.apply(LocalService.java:201)
~[avatica-core-1.23.0.jar:1.23.0]
at
org.apache.calcite.avatica.remote.Service$PrepareRequest.accept(Service.java:1240)
~[avatica-core-1.23.0.jar:1.23.0]
at
org.apache.calcite.avatica.remote.Service$PrepareRequest.accept(Service.java:1211)
~[avatica-core-1.23.0.jar:1.23.0]
```
This PR has:
- [ ] been self-reviewed.
- [ ] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [ ] added documentation for new or modified features or behaviors.
- [ ] a release note entry in the PR description.
- [ ] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [ ] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [ ] 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.
- [ ] added integration tests.
- [ ] been tested in a test Druid cluster.
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