[ZEPPELIN-1366] Removed legacy JDBC alias

### What is this PR for?
Removing old JDBC sugar

### What type of PR is it?
[Feature]

### Todos
* [x] - Removed codes to check jdbc alias enabled

### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-1366

### How should this be tested?
* No longer available
  * `%jdbc(mysql)` -> `%mysql`

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? Yes
* Does this needs documentation? Yes, but I don't know where the proper location is.

Author: Jongyoul Lee <jongyoul@gmail.com>

Closes #1360 from jongyoul/ZEPPELIN-1366 and squashes the following commits:

f9df86e [Jongyoul Lee] Changed description
302825c [Jongyoul Lee] Removed effectiveText and related test
929bad2 [Jongyoul Lee] Updated docs for breaking changes
e52521f [Jongyoul Lee] Removed test for jdbc sugar
9f46bbd [Jongyoul Lee] Resolved codes conflicted

docs/install/upgrade.md

@@ -49,4 +49,5 @@ So, copying `notebook` and `conf` directory should be enough.
 
 ### Upgrading from Zeppelin 0.6 to 0.7
 
- - From 0.7, we don't use `ZEPPELIN_JAVA_OPTS` as default value of `ZEPPELIN_INTP_JAVA_OPTS` and also the same for `ZEPPELIN_MEM`/`ZEPPELIN_INTP_MEM`. If user want to configure the jvm opts of interpreter process, please set `ZEPPELIN_INTP_JAVA_OPTS` and `ZEPPELIN_INTP_MEM` explicitly.
+ - From 0.7, we don't use `ZEPPELIN_JAVA_OPTS` as default value of `ZEPPELIN_INTP_JAVA_OPTS` and also the same for `ZEPPELIN_MEM`/`ZEPPELIN_INTP_MEM`. If user want to configure the jvm opts of interpreter process, please set `ZEPPELIN_INTP_JAVA_OPTS` and `ZEPPELIN_INTP_MEM` explicitly.
+ - Mapping from `%jdbc(prefix)` to `%prefix` is no longer available. Instead, you can use %[interpreter alias] with multiple interpreter setttings on GUI.

zeppelin-zengine/src/main/java/org/apache/zeppelin/conf/ZeppelinConfiguration.java

@@ -427,10 +427,6 @@ public String getWebsocketMaxTextMessageSize() {
     return getString(ConfVars.ZEPPELIN_WEBSOCKET_MAX_TEXT_MESSAGE_SIZE);
   }
 
-  public boolean getUseJdbcAlias() {
-    return getBoolean(ConfVars.ZEPPELIN_USE_JDBC_ALIAS);
-  }
-
   public Map<String, String> dumpConfigurations(ZeppelinConfiguration conf,
                                                 ConfigurationKeyPredicate predicate) {
     Map<String, String> configurations = new HashMap<>();
@@ -557,9 +553,7 @@ public static enum ConfVars {
     ZEPPELIN_ALLOWED_ORIGINS("zeppelin.server.allowed.origins", "*"),
     ZEPPELIN_ANONYMOUS_ALLOWED("zeppelin.anonymous.allowed", true),
     ZEPPELIN_CREDENTIALS_PERSIST("zeppelin.credentials.persist", true),
-    ZEPPELIN_WEBSOCKET_MAX_TEXT_MESSAGE_SIZE("zeppelin.websocket.max.text.message.size", "1024000"),
-    ZEPPELIN_USE_JDBC_ALIAS("zeppelin.use.jdbc.alias", true);
-
+    ZEPPELIN_WEBSOCKET_MAX_TEXT_MESSAGE_SIZE("zeppelin.websocket.max.text.message.size", "1024000");
 
     private String varName;
     @SuppressWarnings("rawtypes")

zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/Note.java

@@ -374,8 +374,8 @@ public void moveParagraph(String paragraphId, int index, boolean throwWhenIndexI
 
       if (index < 0 || index >= paragraphs.size()) {
         if (throwWhenIndexIsOutOfBound) {
-          throw new IndexOutOfBoundsException("paragraph size is " + paragraphs.size() +
-              " , index is " + index);
+          throw new IndexOutOfBoundsException(
+              "paragraph size is " + paragraphs.size() + " , index is " + index);
         } else {
           return;
         }
@@ -448,7 +448,7 @@ public Map<String, String> generateSingleParagraphInfo(String paragraphId) {
       return new HashMap<>();
     }
   }
-  
+
   private Map<String, String> populatePragraphInfo(Paragraph p) {
     Map<String, String> info = new HashMap<>();
     info.put("id", p.getId());
@@ -496,27 +496,15 @@ public void run(String paragraphId) {
     p.setListener(jobListenerFactory.getParagraphJobListener(this));
     String requiredReplName = p.getRequiredReplName();
     Interpreter intp = factory.getInterpreter(getId(), requiredReplName);
-
     if (intp == null) {
-      // TODO(jongyoul): Make "%jdbc" configurable from JdbcInterpreter
-      if (conf.getUseJdbcAlias() && null != (intp = factory.getInterpreter(getId(), "jdbc"))) {
-        String pText = p.getText().replaceFirst(requiredReplName, "jdbc(" + requiredReplName + ")");
-        logger.debug("New paragraph: {}", pText);
-        p.setEffectiveText(pText);
-      } else {
-        String intpExceptionMsg = format("%s",
-          p.getJobName()
-          + "'s Interpreter "
-          + requiredReplName + " not found"
-        );
-        InterpreterException intpException = new InterpreterException(intpExceptionMsg);
-        InterpreterResult intpResult = new InterpreterResult(
-          InterpreterResult.Code.ERROR, intpException.getMessage()
-        );
-        p.setReturn(intpResult, intpException);
-        p.setStatus(Job.Status.ERROR);
-        throw intpException;
-      }
+      String intpExceptionMsg =
+          p.getJobName() + "'s Interpreter " + requiredReplName + " not found";
+      InterpreterException intpException = new InterpreterException(intpExceptionMsg);
+      InterpreterResult intpResult =
+          new InterpreterResult(InterpreterResult.Code.ERROR, intpException.getMessage());
+      p.setReturn(intpResult, intpException);
+      p.setStatus(Job.Status.ERROR);
+      throw intpException;
     }
     if (p.getConfig().get("enabled") == null || (Boolean) p.getConfig().get("enabled")) {
       intp.getScheduler().submit(p);

zeppelin-zengine/src/main/java/org/apache/zeppelin/notebook/Paragraph.java

@@ -53,7 +53,6 @@ public class Paragraph extends Job implements Serializable, Cloneable {
   private transient InterpreterFactory factory;
   private transient Note note;
   private transient AuthenticationInfo authenticationInfo;
-  private transient String effectiveText;
 
   String title;
   String text;
@@ -114,14 +113,6 @@ public void setText(String newText) {
     this.dateUpdated = new Date();
   }
 
-  public void setEffectiveText(String effectiveText) {
-    this.effectiveText = effectiveText;
-  }
-
-  public String getEffectiveText() {
-    return effectiveText;
-  }
-
   public AuthenticationInfo getAuthenticationInfo() {
     return authenticationInfo;
   }
@@ -153,7 +144,7 @@ public boolean isEnabled() {
   }
 
   public String getRequiredReplName() {
-    return getRequiredReplName(null != effectiveText ? effectiveText : text);
+    return getRequiredReplName(text);
   }
 
   public static String getRequiredReplName(String text) {
@@ -182,7 +173,7 @@ public static String getRequiredReplName(String text) {
   }
 
   public String getScriptBody() {
-    return getScriptBody(null != effectiveText ? effectiveText : text);
+    return getScriptBody(text);
   }
 
   public static String getScriptBody(String text) {
@@ -359,7 +350,6 @@ protected Object jobRun() throws Throwable {
       }
     } finally {
       InterpreterContext.remove();
-      effectiveText = null;
     }
   }
 

zeppelin-zengine/src/test/java/org/apache/zeppelin/notebook/NoteTest.java

@@ -82,27 +82,6 @@ public void runNormalTest() {
     assertEquals("Paragraph text", pText, pCaptor.getValue().getText());
   }
 
-  @Test
-  public void runJdbcTest() {
-    when(interpreterFactory.getInterpreter(anyString(), eq("mysql"))).thenReturn(null);
-    when(interpreterFactory.getInterpreter(anyString(), eq("jdbc"))).thenReturn(interpreter);
-    when(interpreter.getScheduler()).thenReturn(scheduler);
-
-    String pText = "%mysql show databases";
-
-    Note note = new Note(repo, interpreterFactory, jobListenerFactory, index, credentials, noteEventListener);
-    Paragraph p = note.addParagraph();
-    p.setText(pText);
-    note.run(p.getId());
-
-    ArgumentCaptor<Paragraph> pCaptor = ArgumentCaptor.forClass(Paragraph.class);
-    verify(scheduler, only()).submit(pCaptor.capture());
-    verify(interpreterFactory, times(2)).getInterpreter(anyString(), anyString());
-
-    assertEquals("Change paragraph text", "%jdbc(mysql) show databases", pCaptor.getValue().getEffectiveText());
-    assertEquals("Change paragraph text", pText, pCaptor.getValue().getText());
-  }
-
   @Test
   public void putDefaultReplNameIfInterpreterSettingAbsent() {
     when(interpreterFactory.getDefaultInterpreterSetting(anyString()))

zeppelin-zengine/src/test/java/org/apache/zeppelin/notebook/ParagraphTest.java

@@ -73,32 +73,6 @@ public void replNameEndsWithWhitespace() {
     assertEquals("md", Paragraph.getRequiredReplName(text));
   }
 
-  @Test
-  public void effectiveTextTest() {
-    InterpreterFactory interpreterFactory = mock(InterpreterFactory.class);
-    Interpreter interpreter = mock(Interpreter.class);
-    Note note = mock(Note.class);
-
-    Paragraph p = new Paragraph("paragraph", note, null, interpreterFactory);
-    p.setText("%h2 show databases");
-    p.setEffectiveText("%jdbc(h2) show databases");
-    assertEquals("Get right replName", "jdbc", p.getRequiredReplName());
-    assertEquals("Get right scriptBody", "(h2) show databases", p.getScriptBody());
-
-    when(interpreterFactory.getInterpreter(anyString(), eq("jdbc"))).thenReturn(interpreter);
-    when(interpreter.getFormType()).thenReturn(Interpreter.FormType.NATIVE);
-    when(note.getId()).thenReturn("noteId");
-
-    try {
-      p.jobRun();
-    } catch (Throwable throwable) {
-      // Do nothing
-    }
-
-    assertEquals("Erase effective Text", "h2", p.getRequiredReplName());
-    assertEquals("Erase effective Text", "show databases", p.getScriptBody());
-  }
-
   @Test
   public void should_extract_variable_from_angular_object_registry() throws Exception {
     //Given