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Posted to github@beam.apache.org by "PDGGK (via GitHub)" <gi...@apache.org> on 2026/01/18 16:46:21 UTC
[PR] Fix RequestResponseIO parseAndThrow to preserve retryable exception types [beam]
PDGGK opened a new pull request, #37341:
URL: https://github.com/apache/beam/pull/37341
## Description
Fixes #37176
The `parseAndThrow` method in `Call.java` was wrapping retryable exceptions (`UserCodeTimeoutException`, `UserCodeRemoteSystemException`) in a generic `UserCodeExecutionException`, which breaks the retry logic that depends on `exception.shouldRepeat()` returning true.
## Problem
When user code throws a `UserCodeTimeoutException` or `UserCodeRemoteSystemException` (which have `shouldRepeat() = true`), the old implementation would wrap these in a generic `UserCodeExecutionException` (which has `shouldRepeat() = false`), causing the `Repeater` to not retry the operation as intended.
## Solution
- Scan the full causal chain using Guava's `Throwables.getCausalChain()`
- Preserve all specific retryable exception types (Quota/Timeout/RemoteSystem)
- Prefer specific types over generic `UserCodeExecutionException` when both exist in the chain to prevent masking of retryable exceptions
- Handle circular causal chains gracefully by catching `IllegalArgumentException`
## Changes
### Modified Files
**`sdks/java/io/rrio/src/main/java/org/apache/beam/io/requestresponse/Call.java`** (+31/-7 lines)
- Added `Throwables` import for causal chain traversal
- Rewrote `parseAndThrow` method to scan full exception chain
- Added logic to prefer specific exception types over generic ones
- Added circular reference handling
**`sdks/java/io/rrio/src/test/java/org/apache/beam/io/requestresponse/CallTest.java`** (+264/-2 lines)
- Added 10 new unit tests covering various exception scenarios
## Testing
Added comprehensive test coverage for:
- ✅ Direct retryable exceptions (Timeout, RemoteSystem, Quota)
- ✅ Nested exceptions wrapped in `UncheckedExecutionException`
- ✅ Generic `UserCodeExecutionException` masking specific types (3 scenarios)
- ✅ Triple-nested exceptions
- ✅ Circular reference in causal chain
- ✅ Non-UserCode exceptions (RuntimeException)
**Test Results:**
- `CallTest`: All tests passing
- Full `rrio` test suite: 90 tasks passing ✅
- Code formatting: `spotlessCheck` passing ✅
## Impact
**Behavior Change:** Code that previously saw a generic `UserCodeExecutionException` may now see the specific subtype (`UserCodeTimeoutException`/`UserCodeRemoteSystemException`). This is the **intended fix** to restore proper retry behavior.
**Performance:** Minimal impact - exception chain traversal only occurs on error paths.
**Backwards Compatibility:** The change improves correctness. Any code that relied on exceptions being wrapped was working around a bug.
## Example
**Before:**
```java
// User code throws UserCodeTimeoutException
throw new UserCodeTimeoutException("timeout");
// parseAndThrow wraps it
throw new UserCodeExecutionException(cause); // shouldRepeat() = false ❌
// Repeater sees generic exception and doesn't retry
```
**After:**
```java
// User code throws UserCodeTimeoutException
throw new UserCodeTimeoutException("timeout");
// parseAndThrow preserves it
throw (UserCodeTimeoutException) throwable; // shouldRepeat() = true ✅
// Repeater sees timeout exception and retries
```
## Checklist
- [x] Addresses issue #37176
- [x] All retryable exceptions are preserved
- [x] Circular references handled gracefully
- [x] Generic exception masking prevented
- [x] Comprehensive test coverage added (10 new tests)
- [x] All existing tests pass
- [x] Code formatting clean (spotless)
- [x] No breaking changes to public API
- [x] Commit message follows conventions
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Re: [PR] Fix RequestResponseIO parseAndThrow to preserve retryable exception types [beam]
Posted by "PDGGK (via GitHub)" <gi...@apache.org>.
PDGGK closed pull request #37341: Fix RequestResponseIO parseAndThrow to preserve retryable exception types
URL: https://github.com/apache/beam/pull/37341
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Re: [PR] Fix RequestResponseIO parseAndThrow to preserve retryable exception types [beam]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #37341:
URL: https://github.com/apache/beam/pull/37341#issuecomment-3765561168
Assigning reviewers:
R: @jrmccluskey for label python.
R: @Abacn for label java.
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Re: [PR] Fix RequestResponseIO parseAndThrow to preserve retryable exception types [beam]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #37341:
URL: https://github.com/apache/beam/pull/37341#issuecomment-3765531285
Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment `assign set of reviewers`
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Re: [PR] Fix RequestResponseIO parseAndThrow to preserve retryable exception types [beam]
Posted by "PDGGK (via GitHub)" <gi...@apache.org>.
PDGGK commented on PR #37341:
URL: https://github.com/apache/beam/pull/37341#issuecomment-3766112351
Hi! I notice that 2 Python PreCommit checks failed (Python 3.10 and 3.11), but Python 3.12 and 3.13 passed successfully.
Since this PR only modifies Java files (`Call.java` and `CallTest.java`) in `sdks/java/io/rrio/`, and all Java checks (including `beam_PreCommit_Java_RequestResponse_IO_Direct`) passed, these Python failures appear to be unrelated to the changes.
The failure pattern (only 3.10/3.11, not 3.12/3.13) suggests this might be a flaky test or infrastructure issue specific to those Python versions.
Could someone please re-run the failed Python PreCommit checks? Thank you!
**Failed checks:**
- `beam_PreCommit_Python (Run Python PreCommit 3.10)`
- `beam_PreCommit_Python (Run Python PreCommit 3.11)`
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Re: [PR] Fix RequestResponseIO parseAndThrow to preserve retryable exception types [beam]
Posted by "gemini-code-assist[bot] (via GitHub)" <gi...@apache.org>.
gemini-code-assist[bot] commented on PR #37341:
URL: https://github.com/apache/beam/pull/37341#issuecomment-3765483937
## Summary of Changes
Hello @PDGGK, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request addresses a critical bug in the RequestResponseIO component where retryable exceptions were being masked by a generic exception type, preventing the intended retry mechanism from functioning correctly. The changes ensure that the original, specific retryable exception types are preserved and propagated, thereby restoring proper retry behavior and improving the reliability of user code execution within the RRIO framework. Additionally, the Python SDK's error messages for non-serializable user code have been enhanced to provide clearer guidance for developers.
### Highlights
* **Exception Preservation in RequestResponseIO**: The `parseAndThrow` method in `Call.java` has been updated to correctly preserve retryable exception types (e.g., `UserCodeTimeoutException`, `UserCodeRemoteSystemException`, `UserCodeQuotaException`) by scanning the full causal chain. Previously, these were incorrectly wrapped in a generic `UserCodeExecutionException`, which prevented proper retry logic.
* **Causal Chain Traversal and Prioritization**: The updated logic uses Guava's `Throwables.getCausalChain()` to inspect all nested exceptions. It prioritizes re-throwing specific retryable exceptions over generic `UserCodeExecutionException` when both are present in the chain, ensuring that the most specific and actionable exception is exposed.
* **Circular Reference Handling**: The `parseAndThrow` method now gracefully handles circular references within an exception's causal chain by catching `IllegalArgumentException` and wrapping it in a `UserCodeExecutionException` with an informative message.
* **Comprehensive Test Coverage**: Ten new unit tests have been added to `CallTest.java` to cover various exception scenarios, including direct retryable exceptions, nested exceptions, generic wrapping, and circular references, ensuring the robustness of the fix.
* **Improved Python Pickling Error Messages**: The Python SDK's `ptransform.py` now provides a more detailed and helpful error message when user code fails to pickle. The message includes common causes for non-serializable objects and suggestions for resolution, such as using module-level functions or initializing resources in `setup()` methods.
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Re: [PR] Fix RequestResponseIO parseAndThrow to preserve retryable exception types [beam]
Posted by "PDGGK (via GitHub)" <gi...@apache.org>.
PDGGK commented on PR #37341:
URL: https://github.com/apache/beam/pull/37341#issuecomment-3766143238
Closing this PR as it was created from the wrong branch (`fix-issue-37176-exception-wrapping`) which contained unrelated Python changes from PR #37298.
Created a new PR #37342 from a clean branch (`java-fix-requestresponseio`) that contains only the Java changes for this fix. This should resolve the Python CI failures that were appearing here.
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