sollhui opened a new pull request, #63634:
URL: https://github.com/apache/doris/pull/63634
### What problem does this PR solve?
Problem Summary:
In cloud mode with multiple compute groups, transactional `insert into
values` may fail with:
`Cannot invoke "org.apache.doris.system.Backend.getHost()" because "backend"
is null`
The root cause is that `InsertStreamTxnExecutor` selected a backend id from
all clusters through `selectBackendIdsByPolicy(policy, 1)`, but then looked up
the selected id from `getBackendsByCurrentCluster()`. If the selected backend
belonged to another compute group, the lookup returned null and FE hit an NPE
when calling `backend.getHost()`.
This PR changes txn insert backend selection to use the current cluster
backend snapshot as the candidate list, so the selected backend is always from
the current compute group.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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