SOLR-6892: Improve the way update processors are used and make it simpler

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1666436 13f79535-47bb-0310-9956-ffa450edef68

solr/CHANGES.txt

@@ -234,6 +234,8 @@ Bug Fixes
 * SOLR-6682: Fix response when using EnumField with StatsComponent
   (Xu Zhang via hossman)
 
+* SOLR-6892: Improve the way update processors are used and make it simpler (Noble Paul)
+
 Optimizations
 ----------------------
 

solr/contrib/dataimporthandler/src/java/org/apache/solr/handler/dataimport/DataImportHandler.java

@@ -170,7 +170,7 @@ public class DataImportHandler extends RequestHandlerBase implements
               IMPORT_CMD.equals(command)) {
         importer.maybeReloadConfiguration(requestParams, defaultParams);
         UpdateRequestProcessorChain processorChain =
-                req.getCore().getUpdateProcessingChain(params.get(UpdateParams.UPDATE_CHAIN));
+                req.getCore().getUpdateProcessorChain(params);
         UpdateRequestProcessor processor = processorChain.createProcessor(req, rsp);
         SolrResourceLoader loader = req.getCore().getResourceLoader();
         DIHWriter sw = getSolrWriter(processor, loader, requestParams, req);

solr/core/src/java/org/apache/solr/cloud/CloudUtil.java

@@ -117,7 +117,7 @@ public class CloudUtil {
             "/" + key, null, null, true));
       }
     } catch (KeeperException.NoNodeException e) {
-      log.warn("Error fetching key names");
+      log.info("Error fetching key names");
       return Collections.EMPTY_MAP;
     } catch (InterruptedException e) {
       Thread.currentThread().interrupt();

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

@@ -259,6 +259,12 @@ public class PluginBag<T> implements AutoCloseable {
       if (inst != null && inst instanceof AutoCloseable) ((AutoCloseable) inst).close();
 
     }
+
+    public String getClassName() {
+      if (isLoaded()) return inst.getClass().getName();
+      if (pluginInfo != null) return pluginInfo.className;
+      return null;
+    }
   }
 
   /**

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

@@ -65,6 +65,7 @@ public class PluginInfo implements MapSerializable{
     LinkedHashMap m = new LinkedHashMap<>(map);
     initArgs = new NamedList();
     for (Map.Entry<String, Object> entry : map.entrySet()) {
+      if (NAME.equals(entry.getKey()) || CLASS_NAME.equals(entry.getKey())) continue;
       Object value = entry.getValue();
       if (value instanceof Map) value = new NamedList((Map) value);
       initArgs.add(entry.getKey(), value);

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

@@ -42,6 +42,7 @@ import org.apache.solr.spelling.QueryConverter;
 import org.apache.solr.update.SolrIndexConfig;
 import org.apache.solr.update.UpdateLog;
 import org.apache.solr.update.processor.UpdateRequestProcessorChain;
+import org.apache.solr.update.processor.UpdateRequestProcessorFactory;
 import org.apache.solr.util.DOMUtil;
 import org.apache.solr.util.FileUtils;
 import org.apache.solr.util.RegexFileFilter;
@@ -302,6 +303,7 @@ public class SolrConfig extends Config implements MapSerializable{
       .add(new SolrPluginInfo(ValueSourceParser.class, "valueSourceParser", REQUIRE_NAME, REQUIRE_CLASS, MULTI_OK))
       .add(new SolrPluginInfo(TransformerFactory.class, "transformer", REQUIRE_NAME, REQUIRE_CLASS, MULTI_OK))
       .add(new SolrPluginInfo(SearchComponent.class, "searchComponent", REQUIRE_NAME, REQUIRE_CLASS, MULTI_OK))
+      .add(new SolrPluginInfo(UpdateRequestProcessorFactory.class, "updateProcessor", REQUIRE_NAME, REQUIRE_CLASS, MULTI_OK))
       // TODO: WTF is up with queryConverter???
       // it aparently *only* works as a singleton? - SOLR-4304
       // and even then -- only if there is a single SpellCheckComponent

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

@@ -77,6 +77,7 @@ import org.apache.solr.common.cloud.SolrZkClient;
 import org.apache.solr.common.params.CommonParams;
 import org.apache.solr.common.params.CommonParams.EchoParamStyle;
 import org.apache.solr.common.params.SolrParams;
+import org.apache.solr.common.params.UpdateParams;
 import org.apache.solr.common.util.ExecutorUtil;
 import org.apache.solr.common.util.IOUtils;
 import org.apache.solr.common.util.NamedList;
@@ -129,7 +130,9 @@ import org.apache.solr.update.processor.DistributedUpdateProcessorFactory;
 import org.apache.solr.update.processor.LogUpdateProcessorFactory;
 import org.apache.solr.update.processor.RunUpdateProcessorFactory;
 import org.apache.solr.update.processor.UpdateRequestProcessorChain;
+import org.apache.solr.update.processor.UpdateRequestProcessorChain.ProcessorInfo;
 import org.apache.solr.update.processor.UpdateRequestProcessorFactory;
+import org.apache.solr.util.ConcurrentLRUCache;
 import org.apache.solr.util.DefaultSolrThreadFactory;
 import org.apache.solr.util.PropertiesInputStream;
 import org.apache.solr.util.RefCounted;
@@ -176,6 +179,7 @@ public final class SolrCore implements SolrInfoMBean, Closeable {
   private final long startTime;
   private final RequestHandlers reqHandlers;
   private final PluginBag<SearchComponent> searchComponents = new PluginBag<>(SearchComponent.class, this);
+  private final PluginBag<UpdateRequestProcessorFactory> updateProcessors = new PluginBag<>(UpdateRequestProcessorFactory.class, this);
   private final Map<String,UpdateRequestProcessorChain> updateProcessorChains;
   private final Map<String, SolrInfoMBean> infoRegistry;
   private IndexDeletionPolicyWrapper solrDelPolicy;
@@ -796,6 +800,7 @@ public final class SolrCore implements SolrInfoMBean, Closeable {
       valueSourceParsers.init(ValueSourceParser.standardValueSourceParsers, this);
       transformerFactories.init(TransformerFactory.defaultFactories, this);
       loadSearchComponents();
+      updateProcessors.init(Collections.EMPTY_MAP, this);
 
       // Processors initialized before the handlers
       updateProcessorChains = loadUpdateProcessorChains();
@@ -993,7 +998,7 @@ public final class SolrCore implements SolrInfoMBean, Closeable {
               new DistributedUpdateProcessorFactory(),
               new RunUpdateProcessorFactory()
       };
-      def = new UpdateRequestProcessorChain(factories, this);
+      def = new UpdateRequestProcessorChain(Arrays.asList(factories), this);
     }
     map.put(null, def);
     map.put("", def);
@@ -1017,6 +1022,18 @@ public final class SolrCore implements SolrInfoMBean, Closeable {
     return chain;
   }
 
+  public UpdateRequestProcessorChain getUpdateProcessorChain(SolrParams params) {
+    String chainName = params.get(UpdateParams.UPDATE_CHAIN);
+    UpdateRequestProcessorChain defaultUrp = getUpdateProcessingChain(chainName);
+    ProcessorInfo processorInfo = new ProcessorInfo(params);
+    if (processorInfo.isEmpty()) return defaultUrp;
+    return UpdateRequestProcessorChain.constructChain(defaultUrp, processorInfo, this);
+  }
+
+  public PluginBag<UpdateRequestProcessorFactory> getUpdateProcessors() {
+    return updateProcessors;
+  }
+
   // this core current usage count
   private final AtomicInteger refCount = new AtomicInteger(1);
 

solr/core/src/java/org/apache/solr/handler/BlobHandler.java

@@ -229,7 +229,7 @@ public class BlobHandler extends RequestHandlerBase  implements PluginInfoInitia
   public static void indexMap(SolrQueryRequest req, SolrQueryResponse rsp, Map<String, Object> doc) throws IOException {
     SolrInputDocument solrDoc = new SolrInputDocument();
     for (Map.Entry<String, Object> e : doc.entrySet()) solrDoc.addField(e.getKey(),e.getValue());
-    UpdateRequestProcessorChain processorChain = req.getCore().getUpdateProcessingChain(req.getParams().get(UpdateParams.UPDATE_CHAIN));
+    UpdateRequestProcessorChain processorChain = req.getCore().getUpdateProcessorChain(req.getParams());
     UpdateRequestProcessor processor = processorChain.createProcessor(req, rsp);
     AddUpdateCommand cmd = new AddUpdateCommand(req);
     cmd.solrDoc = solrDoc;

solr/core/src/java/org/apache/solr/handler/ContentStreamHandlerBase.java

@@ -55,7 +55,7 @@ public abstract class ContentStreamHandlerBase extends RequestHandlerBase {
   public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp) throws Exception {
     SolrParams params = req.getParams();
     UpdateRequestProcessorChain processorChain =
-            req.getCore().getUpdateProcessingChain(params.get(UpdateParams.UPDATE_CHAIN));
+        req.getCore().getUpdateProcessorChain(params);
 
     UpdateRequestProcessor processor = processorChain.createProcessor(req, rsp);
 

solr/core/src/java/org/apache/solr/update/processor/SimpleUpdateProcessorFactory.java

@@ -0,0 +1,48 @@
+package org.apache.solr.update.processor;
+
+/*
+ * 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 java.io.IOException;
+
+import org.apache.solr.request.SolrQueryRequest;
+import org.apache.solr.response.SolrQueryResponse;
+import org.apache.solr.update.AddUpdateCommand;
+
+
+/**
+ * A base class for writing a very simple UpdateProcessor without worrying too much about the API.
+ * This is deliberately made to support only the add operation
+ */
+public abstract class SimpleUpdateProcessorFactory extends UpdateRequestProcessorFactory {
+
+  @Override
+  public UpdateRequestProcessor getInstance(SolrQueryRequest req, SolrQueryResponse rsp, UpdateRequestProcessor next) {
+    return new UpdateRequestProcessor(next) {
+      @Override
+      public void processAdd(AddUpdateCommand cmd) throws IOException {
+        process(cmd, req, rsp);
+        super.processAdd(cmd);
+      }
+    };
+  }
+
+  /**
+   * This object is reused across requests. So,this method should not store anything in the instance variable.
+   */
+  protected abstract void process(AddUpdateCommand cmd, SolrQueryRequest req, SolrQueryResponse rsp);
+}

solr/core/src/java/org/apache/solr/update/processor/UpdateRequestProcessorChain.java

@@ -17,6 +17,9 @@
 
 package org.apache.solr.update.processor;
 
+import org.apache.solr.common.params.MapSolrParams;
+import org.apache.solr.common.params.SolrParams;
+import org.apache.solr.common.util.StrUtils;
 import org.apache.solr.request.SolrQueryRequest;
 import org.apache.solr.response.SolrQueryResponse;
 import org.apache.solr.util.plugin.PluginInfoInitialized;
@@ -28,8 +31,12 @@ import org.apache.solr.core.SolrCore;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.ArrayList;
+import java.util.Objects;
 
 /**
  * Manages a chain of UpdateRequestProcessorFactories.
@@ -87,7 +94,7 @@ public final class UpdateRequestProcessorChain implements PluginInfoInitialized
 {
   public final static Logger log = LoggerFactory.getLogger(UpdateRequestProcessorChain.class);
 
-  private UpdateRequestProcessorFactory[] chain;
+  private List<UpdateRequestProcessorFactory> chain;
   private final SolrCore solrCore;
 
   public UpdateRequestProcessorChain(SolrCore solrCore) {
@@ -152,14 +159,19 @@ public final class UpdateRequestProcessorChain implements PluginInfoInitialized
       log.info("inserting DistributedUpdateProcessorFactory into " + infomsg);
     }
 
-    chain = list.toArray(new UpdateRequestProcessorFactory[list.size()]); 
+    chain = list;
+    ProcessorInfo processorInfo = new ProcessorInfo(new MapSolrParams(info.attributes));
+    if (processorInfo.isEmpty()) return;
+    UpdateRequestProcessorChain newChain = constructChain(this, processorInfo, solrCore);
+    chain = newChain.chain;
+
   }
 
   /**
-   * Creates a chain backed directly by the specified array. Modifications to 
+   * Creates a chain backed directly by the specified list. Modifications to
    * the array will affect future calls to <code>createProcessor</code>
    */
-  public UpdateRequestProcessorChain( UpdateRequestProcessorFactory[] chain, 
+  public UpdateRequestProcessorChain(List<UpdateRequestProcessorFactory> chain,
                                       SolrCore solrCore) {
     this.chain = chain;
     this.solrCore =  solrCore;
@@ -187,8 +199,8 @@ public final class UpdateRequestProcessorChain implements PluginInfoInitialized
     final boolean skipToDistrib = distribPhase != null;
     boolean afterDistrib = true;  // we iterate backwards, so true to start
 
-    for (int i = chain.length-1; i>=0; i--) {
+    for (int i = chain.size() - 1; i >= 0; i--) {
-      UpdateRequestProcessorFactory factory = chain[i];
+      UpdateRequestProcessorFactory factory = chain.get(i);
 
       if (skipToDistrib) {
         if (afterDistrib) {
@@ -208,13 +220,101 @@ public final class UpdateRequestProcessorChain implements PluginInfoInitialized
     return last;
   }
 
+
+  @Deprecated
+  public UpdateRequestProcessorFactory[] getFactories() {
+    return chain.toArray(new UpdateRequestProcessorFactory[0]);
+  }
+
   /**
    * Returns the underlying array of factories used in this chain.
    * Modifications to the array will affect future calls to
    * <code>createProcessor</code>
    */
-  public UpdateRequestProcessorFactory[] getFactories() {
+  public List<UpdateRequestProcessorFactory> getProcessors() {
     return chain;
   }
 
+  public static UpdateRequestProcessorChain constructChain(UpdateRequestProcessorChain defaultUrp,
+                                                           ProcessorInfo processorInfo, SolrCore core) {
+    LinkedList<UpdateRequestProcessorFactory> urps = new LinkedList(defaultUrp.chain);
+    List<UpdateRequestProcessorFactory> p = getReqProcessors(processorInfo.processor, core);
+    List<UpdateRequestProcessorFactory> post = getReqProcessors(processorInfo.postProcessor, core);
+    //processor are tried to be inserted before LogUpdateprocessor+DistributedUpdateProcessor
+    insertBefore(urps, p, DistributedUpdateProcessorFactory.class, 0);
+    //port-processor is tried to be inserted before RunUpdateProcessor
+    insertBefore(urps, post, RunUpdateProcessorFactory.class, urps.size() - 1);
+    UpdateRequestProcessorChain result = new UpdateRequestProcessorChain(urps, core);
+    if (log.isInfoEnabled()) {
+      ArrayList<String> names = new ArrayList<>(urps.size());
+      for (UpdateRequestProcessorFactory urp : urps) names.add(urp.getClass().getSimpleName());
+      log.info("New dynamic chain constructed : " + StrUtils.join(names, '>'));
+    }
+    return result;
+  }
+
+  private static void insertBefore(LinkedList<UpdateRequestProcessorFactory> urps, List<UpdateRequestProcessorFactory> newFactories, Class klas, int idx) {
+    if (newFactories.isEmpty()) return;
+    for (int i = 0; i < urps.size(); i++) {
+      if (klas.isInstance(urps.get(i))) {
+        idx = i;
+        if (klas == DistributedUpdateProcessorFactory.class) {
+          if (i > 0 && urps.get(i - 1) instanceof LogUpdateProcessorFactory) {
+            idx = i - 1;
+          }
+        }
+        break;
+      }
+    }
+    for (int i = newFactories.size() - 1; 0 <= i; i--) urps.add(idx, newFactories.get(i));
+  }
+
+  static List<UpdateRequestProcessorFactory> getReqProcessors(String processor, SolrCore core) {
+    if (processor == null) return Collections.EMPTY_LIST;
+    List<UpdateRequestProcessorFactory> result = new ArrayList<>();
+    if (processor != null) {
+      List<String> names = StrUtils.splitSmart(processor, ',');
+      List<UpdateRequestProcessorFactory> l = new ArrayList<>(names.size());
+      for (String s : names) {
+        s = s.trim();
+        if (s.isEmpty()) continue;
+        UpdateRequestProcessorFactory p = core.getUpdateProcessors().get(s);
+        if (p == null)
+          throw new SolrException(SolrException.ErrorCode.BAD_REQUEST, "No such processor " + s);
+        result.add(p);
+      }
+    }
+    return result;
+  }
+
+  public static class ProcessorInfo {
+    public final String processor, postProcessor;
+
+    public ProcessorInfo(SolrParams params) {
+      processor = params.get("processor");
+      postProcessor = params.get("post-processor");
+    }
+
+    public boolean isEmpty() {
+      return processor == null && postProcessor == null;
+    }
+
+    @Override
+    public int hashCode() {
+      int hash = 0;
+      if (processor != null) hash += processor.hashCode();
+      if (postProcessor != null) hash += postProcessor.hashCode();
+      return hash;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      if (!(obj instanceof ProcessorInfo)) return false;
+      ProcessorInfo that = (ProcessorInfo) obj;
+
+      return Objects.equals(this.processor, that.processor) &&
+          Objects.equals(this.postProcessor, that.postProcessor);
+    }
+  }
+
 }

solr/core/src/test/org/apache/solr/handler/TestBlobHandler.java

@@ -186,7 +186,7 @@ public class TestBlobHandler extends AbstractFullDistribZkTestBase {
         Map m = (Map) ObjectBuilder.getVal(new JSONParser(new StringReader(response)));
         assertFalse("Error in posting blob "+ getAsString(m),m.containsKey("error"));
       } catch (JSONParser.ParseException e) {
-        log.error(response);
+        log.error("$ERROR$", response, e);
         fail();
       }
     } finally {

solr/core/src/test/org/apache/solr/update/processor/RuntimeUrp.java

@@ -0,0 +1,38 @@
+package org.apache.solr.update.processor;
+
+/*
+ * 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 java.util.ArrayList;
+import java.util.List;
+
+import org.apache.solr.common.util.StrUtils;
+import org.apache.solr.request.SolrQueryRequest;
+import org.apache.solr.response.SolrQueryResponse;
+import org.apache.solr.update.AddUpdateCommand;
+
+public class RuntimeUrp extends SimpleUpdateProcessorFactory {
+  @Override
+  protected void process(AddUpdateCommand cmd, SolrQueryRequest req, SolrQueryResponse rsp) {
+    UpdateRequestProcessorChain processorChain = req.getCore().getUpdateProcessorChain(req.getParams());
+    List<String>  names = new ArrayList<>();
+    for (UpdateRequestProcessorFactory p : processorChain.getProcessors()) {
+      names.add(p.getClass().getSimpleName());
+    }
+    cmd.solrDoc.addField("processors_s", StrUtils.join(names,'>'));
+  }
+}

solr/core/src/test/org/apache/solr/update/processor/TestNamedUpdateProcessors.java

@@ -0,0 +1,188 @@
+package org.apache.solr.update.processor;
+
+/*
+ * 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 java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.List;
+import java.util.zip.ZipEntry;
+import java.util.zip.ZipOutputStream;
+
+import org.apache.solr.client.solrj.SolrClient;
+import org.apache.solr.client.solrj.SolrQuery;
+import org.apache.solr.client.solrj.impl.HttpSolrClient;
+import org.apache.solr.client.solrj.request.UpdateRequest;
+import org.apache.solr.client.solrj.response.QueryResponse;
+import org.apache.solr.cloud.AbstractFullDistribZkTestBase;
+import org.apache.solr.common.SolrDocument;
+import org.apache.solr.common.SolrInputDocument;
+import org.apache.solr.common.util.StrUtils;
+import org.apache.solr.core.TestDynamicLoading;
+import org.apache.solr.core.TestSolrConfigHandler;
+import org.apache.solr.handler.TestBlobHandler;
+import org.apache.solr.util.RESTfulServerProvider;
+import org.apache.solr.util.RestTestHarness;
+import org.apache.solr.util.SimplePostTool;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class TestNamedUpdateProcessors extends AbstractFullDistribZkTestBase {
+  static final Logger log = LoggerFactory.getLogger(TestNamedUpdateProcessors.class);
+  private List<RestTestHarness> restTestHarnesses = new ArrayList<>();
+
+  private void setupHarnesses() {
+    for (final SolrClient client : clients) {
+      RestTestHarness harness = new RestTestHarness(new RESTfulServerProvider() {
+        @Override
+        public String getBaseURL() {
+          return ((HttpSolrClient) client).getBaseURL();
+        }
+      });
+      restTestHarnesses.add(harness);
+    }
+  }
+
+
+  @Override
+  public void distribTearDown() throws Exception {
+    super.distribTearDown();
+    for (RestTestHarness r : restTestHarnesses) {
+      r.close();
+    }
+  }
+
+  @Test
+  public void test() throws Exception {
+    System.setProperty("enable.runtime.lib", "true");
+    setupHarnesses();
+
+    String blobName = "colltest";
+
+    HttpSolrClient randomClient = (HttpSolrClient) clients.get(random().nextInt(clients.size()));
+    String baseURL = randomClient.getBaseURL();
+
+    TestBlobHandler.createSystemCollection(new HttpSolrClient(baseURL.substring(0, baseURL.lastIndexOf('/')), randomClient.getHttpClient()));
+    waitForRecoveriesToFinish(".system", true);
+
+    TestBlobHandler.postAndCheck(cloudClient, baseURL.substring(0, baseURL.lastIndexOf('/')), blobName, TestDynamicLoading.generateZip(RuntimeUrp.class), 1);
+
+    String payload = "{\n" +
+        "'add-runtimelib' : { 'name' : 'colltest' ,'version':1}\n" +
+        "}";
+    RestTestHarness client = restTestHarnesses.get(random().nextInt(restTestHarnesses.size()));
+    TestSolrConfigHandler.runConfigCommand(client, "/config?wt=json", payload);
+    TestSolrConfigHandler.testForResponseElement(client,
+        null,
+        "/config/overlay?wt=json",
+        null,
+        Arrays.asList("overlay", "runtimeLib", blobName, "version"),
+        1l, 10);
+
+    payload = "{\n" +
+        "'create-updateprocessor' : { 'name' : 'firstFld', 'class': 'solr.FirstFieldValueUpdateProcessorFactory', 'fieldName':'test_s'}, \n" +
+        "'create-updateprocessor' : { 'name' : 'test', 'class': 'org.apache.solr.update.processor.RuntimeUrp', 'runtimeLib':true }, \n" +
+        "'create-updateprocessor' : { 'name' : 'maxFld', 'class': 'solr.MaxFieldValueUpdateProcessorFactory', 'fieldName':'mul_s'} \n" +
+        "}";
+
+    client = restTestHarnesses.get(random().nextInt(restTestHarnesses.size()));
+    TestSolrConfigHandler.runConfigCommand(client, "/config?wt=json", payload);
+    for (RestTestHarness restTestHarness : restTestHarnesses) {
+      TestSolrConfigHandler.testForResponseElement(restTestHarness,
+          null,
+          "/config/overlay?wt=json",
+          null,
+          Arrays.asList("overlay", "updateProcessor", "firstFld", "fieldName"),
+          "test_s", 10);
+    }
+
+    SolrInputDocument doc = new SolrInputDocument();
+    doc.addField("id", "123");
+    doc.addField("test_s", Arrays.asList("one", "two"));
+    doc.addField("mul_s", Arrays.asList("aaa", "bbb"));
+    randomClient.add(doc);
+    randomClient.commit(true, true);
+    QueryResponse result = randomClient.query(new SolrQuery("id:123"));
+    assertEquals(2, ((Collection) result.getResults().get(0).getFieldValues("test_s")).size());
+    assertEquals(2, ((Collection) result.getResults().get(0).getFieldValues("mul_s")).size());
+    doc = new SolrInputDocument();
+    doc.addField("id", "456");
+    doc.addField("test_s", Arrays.asList("three", "four"));
+    doc.addField("mul_s", Arrays.asList("aaa", "bbb"));
+    UpdateRequest ur = new UpdateRequest();
+    ur.add(doc).setParam("processor", "firstFld,maxFld,test");
+    randomClient.request(ur);
+    randomClient.commit(true, true);
+    result = randomClient.query(new SolrQuery("id:456"));
+    SolrDocument d = result.getResults().get(0);
+    assertEquals(1, d.getFieldValues("test_s").size());
+    assertEquals(1, d.getFieldValues("mul_s").size());
+    assertEquals("three", d.getFieldValues("test_s").iterator().next());
+    assertEquals("bbb", d.getFieldValues("mul_s").iterator().next());
+    String processors = (String) d.getFirstValue("processors_s");
+    assertNotNull(processors);
+    assertEquals(StrUtils.splitSmart(processors, '>'),
+        Arrays.asList("FirstFieldValueUpdateProcessorFactory", "MaxFieldValueUpdateProcessorFactory", "RuntimeUrp", "LogUpdateProcessorFactory", "DistributedUpdateProcessorFactory", "RunUpdateProcessorFactory"));
+
+
+  }
+
+  public static ByteBuffer getFileContent(String f) throws IOException {
+    ByteBuffer jar;
+    try (FileInputStream fis = new FileInputStream(getFile(f))) {
+      byte[] buf = new byte[fis.available()];
+      fis.read(buf);
+      jar = ByteBuffer.wrap(buf);
+    }
+    return jar;
+  }
+
+  public static ByteBuffer persistZip(String loc, Class... classes) throws IOException {
+    ByteBuffer jar = generateZip(classes);
+    try (FileOutputStream fos = new FileOutputStream(loc)) {
+      fos.write(jar.array(), 0, jar.limit());
+      fos.flush();
+    }
+    return jar;
+  }
+
+
+  public static ByteBuffer generateZip(Class... classes) throws IOException {
+    ZipOutputStream zipOut = null;
+    SimplePostTool.BAOS bos = new SimplePostTool.BAOS();
+    zipOut = new ZipOutputStream(bos);
+    zipOut.setLevel(ZipOutputStream.DEFLATED);
+    for (Class c : classes) {
+      String path = c.getName().replace('.', '/').concat(".class");
+      ZipEntry entry = new ZipEntry(path);
+      ByteBuffer b = SimplePostTool.inputStreamToByteArray(c.getClassLoader().getResourceAsStream(path));
+      zipOut.putNextEntry(entry);
+      zipOut.write(b.array(), 0, b.limit());
+      zipOut.closeEntry();
+    }
+    zipOut.close();
+    return bos.getByteBuffer();
+  }
+
+}