exceptionfactory commented on code in PR #6160:
URL: https://github.com/apache/nifi/pull/6160#discussion_r911266968


##########
minifi/minifi-bootstrap/src/main/java/org/apache/nifi/minifi/bootstrap/util/ConfigTransformer.java:
##########
@@ -750,6 +756,72 @@ protected static void addTextElement(final Element 
element, final String name, f
         element.appendChild(toAdd);
     }
 
+    public static ByteBuffer overrideNonFlowSectionsFromOriginalSchema(byte[] 
newSchema, ByteBuffer currentConfigScheme, Properties bootstrapProperties)
+        throws IOException, InvalidConfigurationException, 
SchemaLoaderException {
+        try {
+            boolean overrideCoreProperties = 
ConfigTransformer.overrideCoreProperties(bootstrapProperties);
+            boolean overrideSecurityProperties = 
ConfigTransformer.overrideSecurityProperties(bootstrapProperties);
+            if (overrideCoreProperties && overrideSecurityProperties) {
+                return ByteBuffer.wrap(newSchema);
+            } else {
+                ConvertableSchema<ConfigSchema> schemaNew = ConfigTransformer
+                    
.throwIfInvalid(SchemaLoader.loadConvertableSchemaFromYaml(new 
ByteArrayInputStream(newSchema)));
+                ConfigSchema configSchemaNew = 
ConfigTransformer.throwIfInvalid(schemaNew.convert());
+                ConvertableSchema<ConfigSchema> schemaOld = ConfigTransformer
+                    
.throwIfInvalid(SchemaLoader.loadConvertableSchemaFromYaml(new 
ByteBufferInputStream(currentConfigScheme)));
+                ConfigSchema configSchemaOld = 
ConfigTransformer.throwIfInvalid(schemaOld.convert());
+
+                
configSchemaNew.setNifiPropertiesOverrides(configSchemaOld.getNifiPropertiesOverrides());
+
+                if (!overrideCoreProperties) {
+                    logger.debug("Preserving previous core properties...");
+                    
configSchemaNew.setCoreProperties(configSchemaOld.getCoreProperties());
+                }
+
+                if (!overrideSecurityProperties) {
+                    logger.debug("Preserving previous security properties...");
+                    
configSchemaNew.setSecurityProperties(configSchemaOld.getSecurityProperties());
+                }
+
+                StringWriter writer = new StringWriter();
+                SchemaLoader.toYaml(configSchemaNew, writer);
+                return 
ByteBuffer.wrap(writer.toString().getBytes()).asReadOnlyBuffer();
+            }
+        } catch (Exception e) {
+            logger.error("Loading the old and the new schema for merging was 
not successful", e);
+            throw e;

Review Comment:
   Is there a reason for logging the error and re-throwing the exception? It 
might be helpful to wrap the exception and throw it with a message, instead of 
this approach.



##########
minifi/minifi-bootstrap/src/test/java/org/apache/nifi/minifi/bootstrap/command/CompositeCommandRunnerTest.java:
##########
@@ -0,0 +1,75 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.nifi.minifi.bootstrap.command;
+
+import static org.apache.nifi.minifi.bootstrap.Status.ERROR;
+import static org.apache.nifi.minifi.bootstrap.Status.OK;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoInteractions;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.when;
+import static org.mockito.MockitoAnnotations.openMocks;
+
+import java.util.Arrays;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+class CompositeCommandRunnerTest {
+
+    private CommandRunner startRunner;
+    private CommandRunner stopRunner;
+    private CompositeCommandRunner compositeCommandRunner;
+
+    @BeforeEach
+    void setup() {
+        startRunner = mock(StartRunner.class);
+        stopRunner = mock(StopRunner.class);

Review Comment:
   Is there a reason for using `mock()` instead of the `Mock` annotation?



##########
minifi/minifi-bootstrap/src/test/java/org/apache/nifi/minifi/bootstrap/service/BootstrapCodecTest.java:
##########
@@ -0,0 +1,189 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.nifi.minifi.bootstrap.service;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoInteractions;
+import static org.mockito.Mockito.when;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.stream.Stream;
+import org.apache.nifi.minifi.bootstrap.RunMiNiFi;
+import 
org.apache.nifi.minifi.bootstrap.configuration.ConfigurationChangeCoordinator;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class BootstrapCodecTest {
+
+    private static final int VALID_PORT = 1;
+    private static final String SECRET = "secret";
+    private static final String OK = "OK";
+    private static final String EMPTY_STRING = "";
+    private RunMiNiFi runner;
+
+    @BeforeEach
+    void setup() {
+        runner = mock(RunMiNiFi.class);
+    }
+
+    @Test
+    void testCommunicateShouldThrowIOExceptionIfThereIsNoCommand() {
+        InputStream inputStream = new ByteArrayInputStream(new byte[0]);
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        BootstrapCodec bootstrapCodec = new BootstrapCodec(runner, 
inputStream, outputStream);
+
+        IOException expectedException = assertThrows(IOException.class, 
bootstrapCodec::communicate);
+        assertEquals("Received invalid command from MiNiFi: null", 
expectedException.getMessage());

Review Comment:
   Asserting the value of an exception message should be avoided. If it is 
important to indicate something specific in the message, it would be better 
check for the presence of a particular keyword.



##########
minifi/minifi-bootstrap/src/main/java/org/apache/nifi/minifi/bootstrap/util/ConfigTransformer.java:
##########
@@ -750,6 +756,72 @@ protected static void addTextElement(final Element 
element, final String name, f
         element.appendChild(toAdd);
     }
 
+    public static ByteBuffer overrideNonFlowSectionsFromOriginalSchema(byte[] 
newSchema, ByteBuffer currentConfigScheme, Properties bootstrapProperties)
+        throws IOException, InvalidConfigurationException, 
SchemaLoaderException {
+        try {
+            boolean overrideCoreProperties = 
ConfigTransformer.overrideCoreProperties(bootstrapProperties);
+            boolean overrideSecurityProperties = 
ConfigTransformer.overrideSecurityProperties(bootstrapProperties);
+            if (overrideCoreProperties && overrideSecurityProperties) {
+                return ByteBuffer.wrap(newSchema);
+            } else {
+                ConvertableSchema<ConfigSchema> schemaNew = ConfigTransformer
+                    
.throwIfInvalid(SchemaLoader.loadConvertableSchemaFromYaml(new 
ByteArrayInputStream(newSchema)));
+                ConfigSchema configSchemaNew = 
ConfigTransformer.throwIfInvalid(schemaNew.convert());
+                ConvertableSchema<ConfigSchema> schemaOld = ConfigTransformer
+                    
.throwIfInvalid(SchemaLoader.loadConvertableSchemaFromYaml(new 
ByteBufferInputStream(currentConfigScheme)));
+                ConfigSchema configSchemaOld = 
ConfigTransformer.throwIfInvalid(schemaOld.convert());
+
+                
configSchemaNew.setNifiPropertiesOverrides(configSchemaOld.getNifiPropertiesOverrides());
+
+                if (!overrideCoreProperties) {
+                    logger.debug("Preserving previous core properties...");
+                    
configSchemaNew.setCoreProperties(configSchemaOld.getCoreProperties());
+                }
+
+                if (!overrideSecurityProperties) {
+                    logger.debug("Preserving previous security properties...");
+                    
configSchemaNew.setSecurityProperties(configSchemaOld.getSecurityProperties());
+                }
+
+                StringWriter writer = new StringWriter();
+                SchemaLoader.toYaml(configSchemaNew, writer);
+                return 
ByteBuffer.wrap(writer.toString().getBytes()).asReadOnlyBuffer();
+            }
+        } catch (Exception e) {
+            logger.error("Loading the old and the new schema for merging was 
not successful", e);
+            throw e;
+        }
+    }
+
+    private static boolean overrideSecurityProperties(Properties properties) {
+        String overrideSecurityProperties = (String) 
properties.getOrDefault(OVERRIDE_SECURITY, "false");
+        boolean overrideSecurity;
+        if ("true".equalsIgnoreCase(overrideSecurityProperties) || 
"false".equalsIgnoreCase(overrideSecurityProperties)) {
+            overrideSecurity = 
Boolean.parseBoolean(overrideSecurityProperties);
+        } else {
+            throw new IllegalArgumentException(
+                "Property, " + OVERRIDE_SECURITY + ", to specify whether to 
override security properties must either be a value boolean value (\"true\" or 
\"false\")" +
+                    " or left to the default value of \"false\". It is set to 
\"" + overrideSecurityProperties + "\".");
+        }
+
+        return overrideSecurity;
+    }
+
+    private static boolean overrideCoreProperties(Properties properties) {
+        String overrideCorePropertiesKey = PULL_HTTP_BASE_KEY + 
".override.core";
+        String overrideCoreProps = (String) 
properties.getOrDefault(overrideCorePropertiesKey, "false");
+        boolean overrideCoreProperties;
+        if ("true".equalsIgnoreCase(overrideCoreProps) || 
"false".equalsIgnoreCase(overrideCoreProps)) {
+            overrideCoreProperties = Boolean.parseBoolean(overrideCoreProps);
+        } else {
+            throw new IllegalArgumentException(
+                "Property, " + overrideCorePropertiesKey + ", to specify 
whether to override core properties must either be a value boolean value 
(\"true\" or \"false\")" +
+                    " or left to the default value of \"false\". It is set to 
\"" + overrideCoreProps + "\".");
+        }

Review Comment:
   See note above on Boolean parsing.



##########
minifi/minifi-bootstrap/src/main/java/org/apache/nifi/minifi/bootstrap/configuration/ingestors/PullHttpChangeIngestor.java:
##########
@@ -234,8 +218,9 @@ public void run() {
                 .build();
 
         final Request.Builder requestBuilder = new Request.Builder()
-                .get()
-                .url(url);
+            .get()
+            .cacheControl(CacheControl.FORCE_NETWORK)

Review Comment:
   Is there a particular reason for adding this option for force network 
requests?



##########
minifi/minifi-bootstrap/src/test/java/org/apache/nifi/minifi/bootstrap/ShutdownHookTest.java:
##########
@@ -0,0 +1,58 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.nifi.minifi.bootstrap;
+
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.STOP;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+
+import org.apache.nifi.minifi.bootstrap.service.MiNiFiStdLogHandler;
+import org.apache.nifi.minifi.bootstrap.service.PeriodicStatusReporterManager;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+class ShutdownHookTest {
+
+    @Mock
+    private RunMiNiFi runner;
+    @Mock
+    private MiNiFiStdLogHandler miNiFiStdLogHandler;
+
+    @InjectMocks
+    private ShutdownHook shutdownHook;
+
+    @Test
+    void testRunShouldShutdownSchedulersAndProcesses() {
+        PeriodicStatusReporterManager periodicStatusReporterManager = 
mock(PeriodicStatusReporterManager.class);

Review Comment:
   Is there a reason for calling `mock()` instead of using a member variable 
annotated with `Mock`?



##########
minifi/minifi-bootstrap/src/test/java/org/apache/nifi/minifi/bootstrap/configuration/ingestors/PullHttpChangeIngestorSSLTest.java:
##########
@@ -76,10 +84,22 @@ public void pullHttpChangeIngestorInit(Properties 
properties) {
         properties.put(PullHttpChangeIngestor.PORT_KEY, String.valueOf(port));
         properties.put(PullHttpChangeIngestor.HOST_KEY, "localhost");
         properties.put(PullHttpChangeIngestor.OVERRIDE_SECURITY, "true");
+        properties.put(PULL_HTTP_BASE_KEY + ".override.core", "true");
+        ConfigurationFileHolder configurationFileHolder = 
Mockito.mock(ConfigurationFileHolder.class);
+
+        try {
+            ConfigSchema configSchema =
+                
SchemaLoader.loadConfigSchemaFromYaml(PullHttpChangeIngestorSSLTest.class.getClassLoader().getResourceAsStream("config.yml"));
+            StringWriter writer = new StringWriter();
+            SchemaLoader.toYaml(configSchema, writer);
+            
when(configurationFileHolder.getConfigFileReference()).thenReturn(new 
AtomicReference<>(ByteBuffer.wrap(writer.toString().getBytes())));
+        } catch (Exception e) {
+            fail("Failed to read test config file", e);
+        }

Review Comment:
   Instead of catching the exception, the method should be changed to declare 
an Exception, which would also fail the test if thrown.



##########
minifi/minifi-bootstrap/src/main/java/org/apache/nifi/minifi/bootstrap/util/ProcessUtils.java:
##########
@@ -0,0 +1,43 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.nifi.minifi.bootstrap.util;
+
+import java.io.IOException;
+
+public interface ProcessUtils {
+    boolean isProcessRunning(Long pid);
+
+    void gracefulShutDownMiNiFiProcess(Long pid, String s, int 
gracefulShutdownSeconds);
+
+    void killProcessTree(Long pid) throws IOException;
+
+    /**
+     * Checks the status of the given process.
+     *
+     * @param process the process object what we want to check
+     * @return true if the process is Alive
+     */
+     default boolean isAlive(Process process) {
+        try {
+            process.exitValue();
+            return false;
+        } catch (IllegalStateException | IllegalThreadStateException itse) {
+            return true;
+        }

Review Comment:
   Is there a reason for this approach as opposed to calling 
`Process.isAlive()`?



##########
minifi/minifi-bootstrap/src/main/java/org/apache/nifi/minifi/bootstrap/util/ProcessUtils.java:
##########
@@ -0,0 +1,43 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.nifi.minifi.bootstrap.util;
+
+import java.io.IOException;
+
+public interface ProcessUtils {
+    boolean isProcessRunning(Long pid);
+
+    void gracefulShutDownMiNiFiProcess(Long pid, String s, int 
gracefulShutdownSeconds);

Review Comment:
   Since this is more generic, what do you think about renaming to 
`shutdownProcess()`?



##########
minifi/minifi-bootstrap/src/test/java/org/apache/nifi/minifi/bootstrap/TestLogAppender.java:
##########
@@ -0,0 +1,51 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.nifi.minifi.bootstrap;
+
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.AppenderBase;
+import java.util.ArrayList;
+
+/**
+ * Helper class which makes possible to subscribe to logging events, and make 
assertions based on it.
+ * With this approach we can avoid static mocking of loggers, which is 
impossible in some cases.
+ */
+public class TestLogAppender extends AppenderBase<ILoggingEvent> {

Review Comment:
   Unit testing the presence of logging messages should be avoided in general, 
as it introduces a greater degree of evaluation than necessary, making it more 
difficult to refactor.



##########
minifi/minifi-bootstrap/src/test/java/org/apache/nifi/minifi/bootstrap/command/CommandRunnerFactoryTest.java:
##########
@@ -0,0 +1,155 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.nifi.minifi.bootstrap.command;
+
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.DUMP;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.ENV;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.FLOWSTATUS;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.RESTART;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.RUN;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.START;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.STATUS;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.STOP;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.UNKNOWN;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.verifyNoInteractions;
+
+import java.io.File;
+import org.apache.nifi.minifi.bootstrap.MiNiFiParameters;
+import org.apache.nifi.minifi.bootstrap.RunMiNiFi;
+import org.apache.nifi.minifi.bootstrap.service.BootstrapFileProvider;
+import org.apache.nifi.minifi.bootstrap.service.CurrentPortProvider;
+import 
org.apache.nifi.minifi.bootstrap.service.GracefulShutdownParameterProvider;
+import org.apache.nifi.minifi.bootstrap.service.MiNiFiCommandSender;
+import org.apache.nifi.minifi.bootstrap.service.MiNiFiExecCommandProvider;
+import org.apache.nifi.minifi.bootstrap.service.MiNiFiStatusProvider;
+import org.apache.nifi.minifi.bootstrap.service.MiNiFiStdLogHandler;
+import org.apache.nifi.minifi.bootstrap.service.PeriodicStatusReporterManager;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+class CommandRunnerFactoryTest {
+
+    @Mock
+    private MiNiFiCommandSender miNiFiCommandSender;
+    @Mock
+    private CurrentPortProvider currentPortProvider;
+    @Mock
+    private MiNiFiParameters miNiFiParameters;
+    @Mock
+    private MiNiFiStatusProvider miNiFiStatusProvider;
+    @Mock
+    private PeriodicStatusReporterManager periodicStatusReporterManager;
+    @Mock
+    private BootstrapFileProvider bootstrapFileProvider;
+    @Mock
+    private MiNiFiStdLogHandler miNiFiStdLogHandler;
+    @Mock
+    private File bootstrapConfigFile;
+    @Mock
+    private RunMiNiFi runMiNiFi;
+    @Mock
+    private GracefulShutdownParameterProvider 
gracefulShutdownParameterProvider;
+    @Mock
+    private MiNiFiExecCommandProvider miNiFiExecCommandProvider;
+
+    @InjectMocks
+    private CommandRunnerFactory commandRunnerFactory;
+
+    @Test
+    void testRunCommandShouldStartCommandReturnStartRunner() {
+        CommandRunner runner = commandRunnerFactory.getRunner(START);
+
+        assertTrue(runner instanceof StartRunner);

Review Comment:
   JUnit 5 now supports `assertInstanceOf`, which can be used here and in other 
methods.



##########
minifi/minifi-bootstrap/src/main/java/org/apache/nifi/minifi/bootstrap/util/ConfigTransformer.java:
##########
@@ -750,6 +756,72 @@ protected static void addTextElement(final Element 
element, final String name, f
         element.appendChild(toAdd);
     }
 
+    public static ByteBuffer overrideNonFlowSectionsFromOriginalSchema(byte[] 
newSchema, ByteBuffer currentConfigScheme, Properties bootstrapProperties)
+        throws IOException, InvalidConfigurationException, 
SchemaLoaderException {
+        try {
+            boolean overrideCoreProperties = 
ConfigTransformer.overrideCoreProperties(bootstrapProperties);
+            boolean overrideSecurityProperties = 
ConfigTransformer.overrideSecurityProperties(bootstrapProperties);
+            if (overrideCoreProperties && overrideSecurityProperties) {
+                return ByteBuffer.wrap(newSchema);
+            } else {
+                ConvertableSchema<ConfigSchema> schemaNew = ConfigTransformer
+                    
.throwIfInvalid(SchemaLoader.loadConvertableSchemaFromYaml(new 
ByteArrayInputStream(newSchema)));
+                ConfigSchema configSchemaNew = 
ConfigTransformer.throwIfInvalid(schemaNew.convert());
+                ConvertableSchema<ConfigSchema> schemaOld = ConfigTransformer
+                    
.throwIfInvalid(SchemaLoader.loadConvertableSchemaFromYaml(new 
ByteBufferInputStream(currentConfigScheme)));
+                ConfigSchema configSchemaOld = 
ConfigTransformer.throwIfInvalid(schemaOld.convert());
+
+                
configSchemaNew.setNifiPropertiesOverrides(configSchemaOld.getNifiPropertiesOverrides());
+
+                if (!overrideCoreProperties) {
+                    logger.debug("Preserving previous core properties...");
+                    
configSchemaNew.setCoreProperties(configSchemaOld.getCoreProperties());
+                }
+
+                if (!overrideSecurityProperties) {
+                    logger.debug("Preserving previous security properties...");
+                    
configSchemaNew.setSecurityProperties(configSchemaOld.getSecurityProperties());
+                }
+
+                StringWriter writer = new StringWriter();
+                SchemaLoader.toYaml(configSchemaNew, writer);
+                return 
ByteBuffer.wrap(writer.toString().getBytes()).asReadOnlyBuffer();
+            }
+        } catch (Exception e) {
+            logger.error("Loading the old and the new schema for merging was 
not successful", e);
+            throw e;
+        }
+    }
+
+    private static boolean overrideSecurityProperties(Properties properties) {
+        String overrideSecurityProperties = (String) 
properties.getOrDefault(OVERRIDE_SECURITY, "false");
+        boolean overrideSecurity;
+        if ("true".equalsIgnoreCase(overrideSecurityProperties) || 
"false".equalsIgnoreCase(overrideSecurityProperties)) {
+            overrideSecurity = 
Boolean.parseBoolean(overrideSecurityProperties);
+        } else {
+            throw new IllegalArgumentException(
+                "Property, " + OVERRIDE_SECURITY + ", to specify whether to 
override security properties must either be a value boolean value (\"true\" or 
\"false\")" +
+                    " or left to the default value of \"false\". It is set to 
\"" + overrideSecurityProperties + "\".");
+        }

Review Comment:
   Is there a reason for this approach as opposed to just calling 
`Boolean.parseBoolean()`? If it is necessary to implement this more restrictive 
Boolean parsing, it would be helpful to introduce a shared method



##########
minifi/minifi-bootstrap/src/test/java/org/apache/nifi/minifi/bootstrap/command/CommandRunnerFactoryTest.java:
##########
@@ -0,0 +1,155 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.nifi.minifi.bootstrap.command;
+
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.DUMP;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.ENV;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.FLOWSTATUS;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.RESTART;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.RUN;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.START;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.STATUS;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.STOP;
+import static org.apache.nifi.minifi.bootstrap.BootstrapCommand.UNKNOWN;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.verifyNoInteractions;
+
+import java.io.File;
+import org.apache.nifi.minifi.bootstrap.MiNiFiParameters;
+import org.apache.nifi.minifi.bootstrap.RunMiNiFi;
+import org.apache.nifi.minifi.bootstrap.service.BootstrapFileProvider;
+import org.apache.nifi.minifi.bootstrap.service.CurrentPortProvider;
+import 
org.apache.nifi.minifi.bootstrap.service.GracefulShutdownParameterProvider;
+import org.apache.nifi.minifi.bootstrap.service.MiNiFiCommandSender;
+import org.apache.nifi.minifi.bootstrap.service.MiNiFiExecCommandProvider;
+import org.apache.nifi.minifi.bootstrap.service.MiNiFiStatusProvider;
+import org.apache.nifi.minifi.bootstrap.service.MiNiFiStdLogHandler;
+import org.apache.nifi.minifi.bootstrap.service.PeriodicStatusReporterManager;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+class CommandRunnerFactoryTest {
+
+    @Mock
+    private MiNiFiCommandSender miNiFiCommandSender;
+    @Mock
+    private CurrentPortProvider currentPortProvider;
+    @Mock
+    private MiNiFiParameters miNiFiParameters;
+    @Mock
+    private MiNiFiStatusProvider miNiFiStatusProvider;
+    @Mock
+    private PeriodicStatusReporterManager periodicStatusReporterManager;
+    @Mock
+    private BootstrapFileProvider bootstrapFileProvider;
+    @Mock
+    private MiNiFiStdLogHandler miNiFiStdLogHandler;
+    @Mock
+    private File bootstrapConfigFile;
+    @Mock
+    private RunMiNiFi runMiNiFi;
+    @Mock
+    private GracefulShutdownParameterProvider 
gracefulShutdownParameterProvider;
+    @Mock
+    private MiNiFiExecCommandProvider miNiFiExecCommandProvider;
+
+    @InjectMocks
+    private CommandRunnerFactory commandRunnerFactory;
+
+    @Test
+    void testRunCommandShouldStartCommandReturnStartRunner() {
+        CommandRunner runner = commandRunnerFactory.getRunner(START);
+
+        assertTrue(runner instanceof StartRunner);
+        verifyNoInteractions(miNiFiCommandSender, currentPortProvider, 
miNiFiParameters, miNiFiStatusProvider, periodicStatusReporterManager, 
bootstrapFileProvider,
+            miNiFiStdLogHandler, bootstrapConfigFile, runMiNiFi, 
gracefulShutdownParameterProvider, miNiFiExecCommandProvider);
+    }
+
+    @Test
+    void testRunCommandShouldRunCommandReturnStartRunner() {
+        CommandRunner runner = commandRunnerFactory.getRunner(RUN);
+
+        assertTrue(runner instanceof StartRunner);
+        verifyNoInteractions(miNiFiCommandSender, currentPortProvider, 
miNiFiParameters, miNiFiStatusProvider, periodicStatusReporterManager, 
bootstrapFileProvider,

Review Comment:
   Is this verification necessary?



##########
minifi/minifi-bootstrap/src/test/java/org/apache/nifi/minifi/bootstrap/command/DumpRunnerTest.java:
##########
@@ -0,0 +1,151 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.nifi.minifi.bootstrap.command;
+
+import static org.apache.nifi.minifi.bootstrap.RunMiNiFi.CMD_LOGGER;
+import static org.apache.nifi.minifi.bootstrap.Status.ERROR;
+import static org.apache.nifi.minifi.bootstrap.Status.MINIFI_NOT_RUNNING;
+import static org.apache.nifi.minifi.bootstrap.Status.OK;
+import static org.apache.nifi.minifi.bootstrap.command.DumpRunner.DUMP_CMD;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.verifyNoInteractions;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.when;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.util.Optional;
+import org.apache.nifi.minifi.bootstrap.TestLogAppender;
+import org.apache.nifi.minifi.bootstrap.service.CurrentPortProvider;
+import org.apache.nifi.minifi.bootstrap.service.MiNiFiCommandSender;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+@ExtendWith(MockitoExtension.class)
+class DumpRunnerTest {
+
+    private static final int MINIFI_PORT = 1337;
+    private static final String DUMP_CONTENT = "dump_content";
+    private static final TestLogAppender LOG_APPENDER = new TestLogAppender();
+
+    @Mock
+    private MiNiFiCommandSender miNiFiCommandSender;
+    @Mock
+    private CurrentPortProvider currentPortProvider;
+
+    @InjectMocks
+    private DumpRunner dumpRunner;
+
+    @BeforeAll
+    static void setupAll() {
+        ((ch.qos.logback.classic.Logger) CMD_LOGGER).addAppender(LOG_APPENDER);
+        LOG_APPENDER.start();
+    }
+
+    @BeforeEach
+    void setup() {
+        LOG_APPENDER.reset();
+    }
+
+    @Test
+    void testRunCommandShouldDumpToConsoleIfNoFileDefined() throws IOException 
{
+        when(currentPortProvider.getCurrentPort()).thenReturn(MINIFI_PORT);
+        when(miNiFiCommandSender.sendCommand(DUMP_CMD, 
MINIFI_PORT)).thenReturn(Optional.of(DUMP_CONTENT));
+
+        int statusCode = dumpRunner.runCommand(new String[0]);
+
+        assertEquals(OK.getStatusCode(), statusCode);
+        assertEquals(DUMP_CONTENT, 
LOG_APPENDER.getLastLoggedEvent().getMessage());
+        verifyNoMoreInteractions(currentPortProvider, miNiFiCommandSender);
+    }
+
+    @Test
+    void testRunCommandShouldDumpToFileIfItIsDefined() throws IOException {
+        when(currentPortProvider.getCurrentPort()).thenReturn(MINIFI_PORT);
+        when(miNiFiCommandSender.sendCommand(DUMP_CMD, 
MINIFI_PORT)).thenReturn(Optional.of(DUMP_CONTENT));
+        File file = Files.createTempFile(null, null).toFile();
+        file.deleteOnExit();
+        String tmpFilePath = file.getAbsolutePath();
+
+        int statusCode = dumpRunner.runCommand(new  String[] {DUMP_CMD, 
tmpFilePath});
+
+        assertEquals(OK.getStatusCode(), statusCode);
+        assertEquals(DUMP_CONTENT, getDumpContent(file));
+        assertEquals("Successfully wrote thread dump to " + tmpFilePath, 
LOG_APPENDER.getLastLoggedEvent().getFormattedMessage());

Review Comment:
   Asserting the value of log messages should be avoided. Recommend removing 
this check and other logging checks.



##########
minifi/minifi-bootstrap/src/test/java/org/apache/nifi/minifi/bootstrap/configuration/ingestors/PullHttpChangeIngestorTest.java:
##########
@@ -55,9 +63,21 @@ public void pullHttpChangeIngestorInit(Properties 
properties) {
         properties.put(PullHttpChangeIngestor.PORT_KEY, String.valueOf(port));
         properties.put(PullHttpChangeIngestor.HOST_KEY, "localhost");
         properties.put(PullHttpChangeIngestor.PULL_HTTP_POLLING_PERIOD_KEY, 
"30000");
+        properties.put(PULL_HTTP_BASE_KEY + ".override.core", "true");
+        ConfigurationFileHolder configurationFileHolder = 
Mockito.mock(ConfigurationFileHolder.class);
+
+        try {
+            ConfigSchema configSchema =
+                
SchemaLoader.loadConfigSchemaFromYaml(PullHttpChangeIngestorTest.class.getClassLoader().getResourceAsStream("config.yml"));
+            StringWriter writer = new StringWriter();
+            SchemaLoader.toYaml(configSchema, writer);
+            
when(configurationFileHolder.getConfigFileReference()).thenReturn(new 
AtomicReference<>(ByteBuffer.wrap(writer.toString().getBytes())));
+        } catch (Exception e) {
+            fail("Failed to read test config file", e);
+        }

Review Comment:
   As noted, this should be changed to declare an Exception instead of catching 
it and failing.



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