SOLR-1730: Hook in handling of bad cores, failure of QEC to load, add in test

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1211827 13f79535-47bb-0310-9956-ffa450edef68

solr/core/src/java/org/apache/solr/core/CoreContainer.java

@@ -215,7 +215,6 @@ public class CoreContainer
     }
     
     /**
-     * @exception generates an error if you attempt to set this value to false
      * @deprecated all cores now abort on configuration error regardless of configuration
      */
     @Deprecated
@@ -246,6 +245,9 @@ public class CoreContainer
       }
       
       solrConfigFilename = cores.getConfigFile().getName();
+      if (cores.cores.isEmpty()){
+        throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, "No cores were created, please check the logs for errors");
+      }
       
       return cores;
     }

solr/core/src/java/org/apache/solr/core/SolrCore.java

@@ -617,11 +617,14 @@ public final class SolrCore implements SolrInfoMBean {
       // Finally tell anyone who wants to know
       resourceLoader.inform( resourceLoader );
       resourceLoader.inform( this );  // last call before the latch is released.
-    } catch (IOException e) {
-      log.error("", e);
+    } catch (Throwable e) {
+      log.error("Error in constructing the core", e);
+      latch.countDown();//release the latch, otherwise we block trying to do the close.  This should be fine, since counting down on a latch of 0 is still fine
+      //close down the searcher and any other resources, if it exists, as this is not recoverable
+      close();
       throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, null, e, false);
     } finally {
-      // allow firstSearcher events to fire
+      // allow firstSearcher events to fire and make sure it is released
       latch.countDown();
     }
 

solr/core/src/java/org/apache/solr/handler/component/QueryElevationComponent.java

@@ -199,7 +199,7 @@ public class QueryElevationComponent extends SearchComponent implements SolrCore
             elevationCache.put(null, loadElevationMap( cfg ));
           } 
         }
-        
+        //in other words, we think this is in the data dir, not the conf dir
         if (!exists){
           // preload the first data
           RefCounted<SolrIndexSearcher> searchHolder = null;
@@ -215,10 +215,10 @@ public class QueryElevationComponent extends SearchComponent implements SolrCore
     }
     catch( Exception ex ) {
       throw new SolrException( SolrException.ErrorCode.SERVER_ERROR,
-          "Error initializing QueryElevationComponent.", ex );
+          "Error initializing QueryElevationComponent.", ex, false );
     }
   }
-
+  //get the elevation map from the data dir
   Map<String, ElevationObj> getElevationMap( IndexReader reader, SolrCore core ) throws Exception
   {
     synchronized( elevationCache ) {
@@ -242,7 +242,7 @@ public class QueryElevationComponent extends SearchComponent implements SolrCore
       return map;
     }
   }
-  
+  //load up the elevation map
   private Map<String, ElevationObj> loadElevationMap( Config cfg ) throws IOException
   {
     XPath xpath = XPathFactory.newInstance().newXPath();

solr/core/src/java/org/apache/solr/servlet/SolrDispatchFilter.java

@@ -96,7 +96,7 @@ public class SolrDispatchFilter implements Filter
     }
     catch( Throwable t ) {
       // catch this so our filter still works
-      log.error( "Could not start Solr. Check solr/home property", t);
+      log.error( "Could not start Solr. Check solr/home property and the logs", t);
       SolrConfig.severeErrors.add( t );
       SolrCore.log( t );
     }

solr/core/src/test-files/solr/conf/solrconfig-elevate.xml

@@ -185,7 +185,17 @@
   <!-- test elevation -->
   <searchComponent name="elevate" class="org.apache.solr.handler.component.QueryElevationComponent" >
     <str name="queryFieldType">string</str>
-    <str name="config-file">elevate.xml</str>
+    <str name="config-file">${elevate.file:elevate.xml}</str>
+  </searchComponent>
+
+  <!-- SOLR-1730 -->
+  <!--<searchComponent name="badElevate" class="org.apache.solr.handler.component.QueryElevationComponent" >
+    <str name="queryFieldType">string</str>
+    <str name="config-file">foo.xml</str>
+  </searchComponent>-->
+  <searchComponent name="dataElevate" class="org.apache.solr.handler.component.QueryElevationComponent" >
+    <str name="queryFieldType">string</str>
+    <str name="config-file">${elevate.data.file:elevate-data.xml}</str>
   </searchComponent>
 
   <requestHandler name="/elevate" class="org.apache.solr.handler.component.SearchHandler">
@@ -197,6 +207,24 @@
     </arr>
   </requestHandler>
 
+  <requestHandler name="/dataElevate" class="org.apache.solr.handler.component.SearchHandler">
+    <lst name="defaults">
+      <str name="echoParams">explicit</str>
+    </lst>
+    <arr name="last-components">
+      <str>dataElevate</str>
+    </arr>
+  </requestHandler>
+
+  <!--<requestHandler name="/badElevate" class="org.apache.solr.handler.component.SearchHandler">
+    <lst name="defaults">
+      <str name="echoParams">explicit</str>
+    </lst>
+    <arr name="last-components">
+      <str>badElevate</str>
+    </arr>
+  </requestHandler>-->
+
   <!-- enable streaming for testing... -->
   <requestDispatcher handleSelect="true" >
     <requestParsers enableRemoteStreaming="true" multipartUploadLimitInKB="2048" />

solr/core/src/test/org/apache/solr/handler/component/BadComponentTest.java

@@ -0,0 +1,43 @@
+package org.apache.solr.handler.component;
+
+
+/*
+ * 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.
+ */
+
+import org.apache.solr.SolrTestCaseJ4;
+import org.apache.solr.common.SolrException;
+import org.junit.Test;
+
+/**
+ * SOLR-1730, tests what happens when a component fails to initialize properly
+ *
+ **/
+public class BadComponentTest extends SolrTestCaseJ4{
+  @Test
+  public void testBadElevate() throws Exception {
+    try {
+      System.setProperty("elevate.file", "foo.xml");
+      initCore("solrconfig-elevate.xml", "schema12.xml");
+      assertTrue(false);
+    } catch (Throwable e) {
+      log.error("Exception", e);
+      assertTrue(true);
+    } finally {
+      System.clearProperty("elevate.file");
+    }
+  }
+}

solr/core/src/test/org/apache/solr/handler/component/QueryElevationComponentTest.java

@@ -30,6 +30,7 @@ import org.apache.solr.SolrTestCaseJ4;
 import org.apache.solr.common.params.CommonParams;
 import org.apache.solr.common.params.MapSolrParams;
 import org.apache.solr.common.params.QueryElevationParams;
+import org.apache.solr.common.util.FileUtils;
 import org.apache.solr.common.util.NamedList;
 import org.apache.solr.core.SolrCore;
 import org.apache.solr.handler.component.QueryElevationComponent.ElevationObj;
@@ -45,7 +46,13 @@ public class QueryElevationComponentTest extends SolrTestCaseJ4 {
 
   @BeforeClass
   public static void beforeClass() throws Exception {
-    initCore("solrconfig-elevate.xml","schema12.xml");
+    //write out elevate-data.xml to the Data dir first by copying it from conf, which we know exists, this way we can test both conf and data configurations
+    createTempDir();
+    File parent = new File(TEST_HOME(), "conf");
+    File elevateFile = new File(parent, "elevate.xml");
+    File elevateDataFile = new File(dataDir, "elevate-data.xml");
+    FileUtils.copyFile(elevateFile, elevateDataFile);
+    initCore("solrconfig-elevate.xml", "schema12.xml");
   }
 
   @Before