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Revert "[SPARK-53015][BUILD] Upgrade log4j to 2.25.1"
This reverts commit 594d26c.
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### What changes were proposed in this pull request?
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I observed an issue in CI that is likely related to this upgrade.
The failure links:
- https://github.com/pan3793/spark/actions/runs/18053335957/job/51379055871
- https://github.com/pan3793/spark/actions/runs/18055074525/job/51383753172
```
2025-09-27T02:32:39.571797348Z spark-listener-group-shared ERROR An exception occurred processing Appender File
java.lang.NullPointerException: Cannot read field "stackLength" because "metadata" is null
at org.apache.logging.log4j.core.pattern.ThrowableStackTraceRenderer.renderStackTraceElements(ThrowableStackTraceRenderer.java:168)
at org.apache.logging.log4j.core.pattern.ThrowableStackTraceRenderer.renderThrowable(ThrowableStackTraceRenderer.java:110)
at org.apache.logging.log4j.core.pattern.ThrowableStackTraceRenderer.renderThrowable(ThrowableStackTraceRenderer.java:87)
at org.apache.logging.log4j.core.pattern.ThrowableStackTraceRenderer.renderThrowable(ThrowableStackTraceRenderer.java:59)
at org.apache.logging.log4j.core.pattern.ThrowablePatternConverter.format(ThrowablePatternConverter.java:130)
at org.apache.logging.log4j.core.layout.PatternLayout$NoFormatPatternSerializer.toSerializable(PatternLayout.java:354)
at org.apache.logging.log4j.core.layout.PatternLayout.toText(PatternLayout.java:251)
...
```
Related issue reports on the log4j repo
- apache/logging-log4j2#3929
- apache/logging-log4j2#3933
### Why are the changes needed?
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Revert a problematic dependency upgrade.
### Does this PR introduce _any_ user-facing change?
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No.
### How was this patch tested?
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Pass GHA.
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No.
Closes#52475 from pan3793/SPARK-53015-revert.
Authored-by: Cheng Pan <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>
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