NIFI-10592-Fix flaky tests caused by the nondeterministic order of HashMap

[yannizhou05]

Summary

NIFI-10592

The tests below were found flaky because of the use of HashMaps and HashSet. The orders of elements in the HashMaps and HashSet are not the same every time being called. In this case, LinkedHashMap and LinkedHashSet is applied to replace Hash in order to ensure the orders are not changing.

• org.apache.nifi.reporting.prometheus.TestPrometheusRecordSink.testSendData
• org.apache.nifi.reporting.azure.loganalytics.TestAzureLogAnalyticsProvenanceReportingTask.testAddField2
• org.apache.nifi.distributed.cache.server.map.DistributedMapCacheTest.testSubMap

It matters to fix this flaky test as it may cause potential issues due to the uncertainty of orders from HashMaps and HashSet rather than the program itself.

Tracking

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Issue Tracking

• Apache NiFi Jira issue created

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Build

• Build completed using mvn install -pl nifi-nar-bundles -am -DskipTests
  • JDK 8
  • JDK 11
  • JDK 17

Test:

• mvn -pl nifi-nar-bundles/nifi-prometheus-bundle/nifi-prometheus-reporting-task edu.illinois:nondex-maven-plugin:1.1.2:nondex -Dtest=org.apache.nifi.reporting.prometheus.TestPrometheusRecordSink#testSendData

• mvn -pl nifi-nar-bundles/nifi-azure-bundle/nifi-azure-reporting-task edu.illinois:nondex-maven-plugin:1.1.2:nondex -Dtest=org.apache.nifi.reporting.azure.loganalytics.TestAzureLogAnalyticsProvenanceReportingTask#testAddField2

• mvn -pl nifi-nar-bundles/nifi-standard-services/nifi-distributed-cache-services-bundle/nifi-distributed-cache-server edu.illinois:nondex-maven-plugin:1.1.2:nondex -Dtest=org.apache.nifi.distributed.cache.server.map.DistributedMapCacheTest#testSubMap

Licensing

• New dependencies are compatible with the Apache License 2.0 according to the License Policy
• New dependencies are documented in applicable LICENSE and NOTICE files

Documentation

• Documentation formatting appears as expected in rendered files

[joewitt]

fixed the checkstyle issue and merged. thanks