CaseyPan opened a new pull request, #15342: URL: https://github.com/apache/druid/pull/15342
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For example: --> #### Fixed flaky tests in FlattenSpecParquetReaderTest.java with ObjectMapper https://github.com/apache/druid/blob/ad32f8458670339808a3136a9578a10a52b8394f/extensions-core/parquet-extensions/src/test/java/org/apache/druid/data/input/parquet/FlattenSpecParquetReaderTest.java#L42 Test: `testFlat1NoFlattenSpec`, `testFlat1Autodiscover`, `testFlat1Flatten`, `testFlat1FlattenSelectListItem`, `testNested1NoFlattenSpec`, `testNested1Autodiscover`, `testNested1Flatten`, `testNested1FlattenSelectListItem` **Steps to Reproduce:** 1. Clone the repo ``` git clone git clone https://github.com/apache/druid.git ``` 2. Install the package ``` mvn install -pl extensions-core/parquet-extensions -am -DskipTests ``` 3. Run the test in regular runs ``` mvn -pl extensions-core/parquet-extensions test -Dtest=org.apache.druid.data.input.parquet.FlattenSpecParquetReaderTest#testname ``` 4. The test failed by running the test with NonDex tool. ``` mvn -pl extensions-core/parquet-extensions edu.illinois:nondex-maven-plugin:2.1.1:nondex -Dcheckstyle.skip -Dtest=org.apache.druid.data.input.parquet.FlattenSpecParquetReaderTest#testname ``` The following is an example error message from `testFlat1Flatten` ```console [ERROR] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 2.839 s <<< FAILURE! - in org.apache.druid.data.input.parquet.FlattenSpecParquetReaderTest [ERROR] org.apache.druid.data.input.parquet.FlattenSpecParquetReaderTest.testFlat1Flatten - Time elapsed: 0.073 s <<< FAILURE! org.junit.ComparisonFailure: expected:<{ "ListDim" : [ "listDim1v1", "listDim1v2" ], "dim3" : 1, "dim2" : "d2v1", "dim1" : "d1v1", "metric1" : 1, "timestamp" : 1537229880023 }> but was:<{ "dim3" : 1, "timestamp" : 1537229880023, "dim2" : "d2v1", "ListDim" : [ "listDim1v1", "listDim1v2" ], "metric1" : 1, "dim1" : "d1v1" }> at org.junit.Assert.assertEquals(Assert.java:117) ``` **Reason of flakiness:** These tests check the equality of two JSON strings. The data reading methods used `createReader()` in those tests do not retrieve data in a consistent order, which can possibly lead to different JSON representations of the same data during test runs. **Changes:** - Imported `fasterxml.jackson` package, and changed from using standard assertion method `Assert` to using `JSONNode` and `ObjectMapper`, which parse two JSON strings and convert them to a tree structure and each node in the trees are compared. Thus, the order of the elements in JSON strings is deterministic and the test passes. <!-- In each section, please describe design decisions made, including: - Choice of algorithms - Behavioral aspects. What configuration values are acceptable? 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If something hasn't changed since the original discussion, you can omit a detailed discussion of those aspects of the design here, perhaps apart from brief mentioning for the sake of readability of this PR description. --> <!-- Some of the aspects mentioned above may be omitted for simple and small changes. --> #### Release note <!-- Give your best effort to summarize your changes in a couple of sentences aimed toward Druid users. If your change doesn't have end user impact, you can skip this section. For tips about how to write a good release note, see [Release notes](https://github.com/apache/druid/blob/master/CONTRIBUTING.md#release-notes). --> Fixed: `FlattenSpecParquetReaderTest.java` tests no longer fail when running with the NonDex tool. <hr> <!-- Check the items by putting "x" in the brackets for the done things. Not all of these items apply to every PR. Remove the items which are not done or not relevant to the PR. 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Linked related entities via Javadoc links. - [ ] added or updated version, license, or notice information in [licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md) - [ ] added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader. - [ ] added unit tests or modified existing tests to cover new code paths, ensuring the threshold for [code coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md) is met. - [ ] added integration tests. - [ ] been tested in a test Druid cluster. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. 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