spuru9 commented on code in PR #29120:
URL: https://github.com/apache/flink/pull/29120#discussion_r3948236113
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flink-core/src/test/java/org/apache/flink/util/MdcLogbackCompatibilityTest.java:
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@@ -67,13 +66,13 @@ void testContextRestorationWorksWithNullContext() {
}
private MDCAdapter getCurrentMDCAdapter() throws Exception {
- Field adapterField = MDC.class.getDeclaredField("mdcAdapter");
+ Field adapterField = MDC.class.getDeclaredField("MDC_ADAPTER");
adapterField.setAccessible(true);
return (MDCAdapter) adapterField.get(null);
}
Review Comment:
Retracting this suggestion, sorry for the noise. I decompiled
`MDC.getMDCAdapter()` in 2.0.x and it's not a plain field read:
```
getstatic MDC_ADAPTER
ifnonnull -> return it
invokestatic getMDCAdapterGivenByProvider() // calls
LoggerFactory.getProvider(), logs ERROR
// if none found, falls back
to NOPMDCAdapter
putstatic MDC_ADAPTER // caches the fallback back
into the static field
getstatic MDC_ADAPTER
```
If `MDC_ADAPTER` is still null when the test runs (plausible here, since
flink-core doesn't bundle a real logging backend in test scope per the class
javadoc), calling the public getter instead of reading the field directly would
trigger a provider lookup, emit spurious ERROR-level log lines, and permanently
cache a NOPMDCAdapter into the static field for the rest of the test JVM. The
raw reflection read this PR already has avoids all of that, so it should stay
as-is.
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