KangweiZhu opened a new pull request, #6107:
URL: https://github.com/apache/hive/pull/6107
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### What changes were proposed in this pull request?
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This PR fixes a nondeterministic behavior in
`TestEmbeddedHiveMetaStore.testDatabase`
Previously, the test used `getDatabases(".*")` to verify database existence.
However, this method relies on cached lists which may become stale when test
execution order is randomized by
[NonDex](https://github.com/TestingResearchIllinois/NonDex), which is a tool
for detecting hidden assumptions in code by exploring non-deterministic
behaviors of specifications that allow multiple valid implementations.
The fix is to replace getDatabases(".*") with direct getDatabase(name) calls
in the test. This ensures consistent behavior regardless of test shuffling and
avoids relying on potentially stale cached results.
### Why are the changes needed?
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The test was failing nondeterministically under NonDex with errors like:
```
java.lang.AssertionError: first database is not testdb1 in list: []
```
Root cause: Cached database lists may not reflect the actual state when
randomized execution occurs.
### Does this PR introduce _any_ user-facing change?
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No. I believe this improve the harness of tests without altering and
damaging the core database operations being tested(add, find, drop).
### How was this patch tested?
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Failure observed with running NonDex:
```
mvn -pl standalone-metastore/metastore-server \
edu.illinois:nondex-maven-plugin:2.2.1:nondex \
-Dtest=org.apache.hadoop.hive.metastore.TestEmbeddedHiveMetaStore#testDatabase
```
Under environment:
```
Maven home: /home/anicaazhu/.sdkman/candidates/maven/current
Java version: 21.0.7, vendor: Oracle Corporation, runtime:
/home/anicaazhu/.sdkman/candidates/java/21.0.7-oracle
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "6.16.8-arch3-1", arch: "amd64", family: "unix"
```
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