The GitHub Actions job "Required Checks" on 
texera.git/gh-readonly-queue/main/pr-6811-6de37efa301b4635e3f5189d8872b7b450dca982
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Run started by GitHub user aglinxinyuan (triggered by aglinxinyuan).

Head commit for run:
72522b0637ff496ae1041506b5142295589befb9 / roshiiiiz <[email protected]>
feat(operator): provide user-friendly error message when binary file scan hits 
memory limit (#6811)

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### What changes were proposed in this PR?
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This PR improves the user experience for the File Scan operator's
in-memory read path by gracefully catching natural Java memory limits
and surfacing a helpful UI error message, rather than allowing the
worker JVM to crash.

**Why is it needed?**
Previously, when users mistakenly attempted to read massive files using
the `binary` attribute type (instead of the streaming `large binary`
type), `ByteArrayOutputStream` would attempt to allocate the entire file
into memory. If the file exceeded the JVM's available heap space or the
maximum Java array size, it triggered an unhandled `OutOfMemoryError` or
`IllegalArgumentException`, causing the `computing-unit-master` to lock
up or crash entirely without reporting a user-friendly error to the
frontend UI.

**What was changed:**
- Wrapped the stream reader in `FileScanUtils.safeToByteArray` with a
`try-catch` block.
- Intercepts natural `OutOfMemoryError` and `IllegalArgumentException`
thrown by the JVM or `ByteArrayOutputStream`.
- Throws a clean, user-friendly `RuntimeException` directly to the
frontend directing the user to use the `large binary` attribute type
instead for massive files.

*(Note: Based on maintainer feedback, an initial hardcoded size
threshold approach was dropped in favor of this cleaner architectural
approach that relies on natural JVM limits).*

### Any related issues, documentation, discussions?
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Closes #3271 

### How was this PR tested?
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**Manual Verification:**
1. Uploaded an 8.9 GB CSV test file to the workspace.
2. Created a workflow with the `File Scan` operator configured to use
the `binary` attribute type (which intentionally attempts to load the
entire file into memory).
3. Ran the workflow.
**Result:** The workflow caught the JVM's `OutOfMemoryError` when
attempting the massive allocation, safely aborted the thread, and
successfully threw the custom user-friendly error message in the UI
without crashing the server.

**Automated Tests:**
- Updated the mock in `FileScanUtilsSpec.scala` to simulate a natural
`OutOfMemoryError` being thrown during stream reading to prove the
`catch` block reliably intercepts it and translates it to the
user-friendly exception.

### Was this PR authored or co-authored using generative AI tooling?
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Generated-by: Antigravity (DeepMind)

---------

Co-authored-by: probe <probe@x>
Co-authored-by: Yicong Huang <[email protected]>
Co-authored-by: Xinyuan Lin <[email protected]>

Report URL: https://github.com/apache/texera/actions/runs/31672952126

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