solr/solrj/src/java/org/apache/solr/client/solrj/io/stream/ParallelStream.java - lucene-solr - Git at Google

 /*
  * 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.solr.client.solrj.io.stream;

 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Locale;

 import org.apache.solr.client.solrj.io.Tuple;
 import org.apache.solr.client.solrj.io.comp.FieldComparator;
 import org.apache.solr.client.solrj.io.comp.StreamComparator;
 import org.apache.solr.client.solrj.io.stream.expr.Explanation;
 import org.apache.solr.client.solrj.io.stream.expr.Explanation.ExpressionType;
 import org.apache.solr.client.solrj.io.stream.expr.Expressible;
 import org.apache.solr.client.solrj.io.stream.expr.StreamExplanation;
 import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
 import org.apache.solr.client.solrj.io.stream.expr.StreamExpressionNamedParameter;
 import org.apache.solr.client.solrj.io.stream.expr.StreamExpressionValue;
 import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
 import org.apache.solr.common.params.ModifiableSolrParams;

 import static org.apache.solr.common.params.CommonParams.DISTRIB;
 import static org.apache.solr.common.params.CommonParams.SORT;

 /**
  * The ParallelStream decorates a TupleStream implementation and pushes it to N workers for parallel execution.
  * Workers are chosen from a SolrCloud collection.
  * Tuples that are streamed back from the workers are ordered by a Comparator.
  * @since 5.1.0
  **/
 public class ParallelStream extends CloudSolrStream implements Expressible {

   private TupleStream tupleStream;
   private int workers;
   private transient StreamFactory streamFactory;

   public ParallelStream(String zkHost,
                         String collection,
                         TupleStream tupleStream,
                         int workers,
                         StreamComparator comp) throws IOException {
     init(zkHost,collection,tupleStream,workers,comp);
   }


   public ParallelStream(String zkHost,
                         String collection,
                         String expressionString,
                         int workers,
                         StreamComparator comp) throws IOException {
     TupleStream tStream = this.streamFactory.constructStream(expressionString);
     init(zkHost,collection, tStream, workers,comp);
   }

   public void setStreamFactory(StreamFactory streamFactory) {
     this.streamFactory = streamFactory;
   }

   public ParallelStream(StreamExpression expression, StreamFactory factory) throws IOException {
     // grab all parameters out
     String collectionName = factory.getValueOperand(expression, 0);
     StreamExpressionNamedParameter workersParam = factory.getNamedOperand(expression, "workers");
     List<StreamExpression> streamExpressions = factory.getExpressionOperandsRepresentingTypes(expression, Expressible.class, TupleStream.class);
     StreamExpressionNamedParameter sortExpression = factory.getNamedOperand(expression, SORT);
     StreamExpressionNamedParameter zkHostExpression = factory.getNamedOperand(expression, "zkHost");

     // validate expression contains only what we want.

     if(expression.getParameters().size() != streamExpressions.size() + 3 + (null != zkHostExpression ? 1 : 0)){
       throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - unknown operands found", expression));
     }

     // Collection Name
     if(null == collectionName){
       throw new IOException(String.format(Locale.ROOT,"invalid expression %s - collectionName expected as first operand",expression));
     }

     // Workers
     if(null == workersParam || null == workersParam.getParameter() || !(workersParam.getParameter() instanceof StreamExpressionValue)){
       throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting a single 'workers' parameter of type positive integer but didn't find one",expression));
     }
     String workersStr = ((StreamExpressionValue)workersParam.getParameter()).getValue();
     int workersInt = 0;
     try{
       workersInt = Integer.parseInt(workersStr);
       if(workersInt <= 0){
         throw new IOException(String.format(Locale.ROOT,"invalid expression %s - workers '%s' must be greater than 0.",expression, workersStr));
       }
     }
     catch(NumberFormatException e){
       throw new IOException(String.format(Locale.ROOT,"invalid expression %s - workers '%s' is not a valid integer.",expression, workersStr));
     }

     // Stream
     if(1 != streamExpressions.size()){
       throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting a single stream but found %d",expression, streamExpressions.size()));
     }

     // Sort
     if(null == sortExpression || !(sortExpression.getParameter() instanceof StreamExpressionValue)){
       throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting single 'sort' parameter telling us how to join the parallel streams but didn't find one",expression));
     }

     // zkHost, optional - if not provided then will look into factory list to get
     String zkHost = null;
     if(null == zkHostExpression){
       zkHost = factory.getCollectionZkHost(collectionName);
       if(zkHost == null) {
         zkHost = factory.getDefaultZkHost();
       }
     }
     else if(zkHostExpression.getParameter() instanceof StreamExpressionValue){
       zkHost = ((StreamExpressionValue)zkHostExpression.getParameter()).getValue();
     }
     if(null == zkHost){
       throw new IOException(String.format(Locale.ROOT,"invalid expression %s - zkHost not found for collection '%s'",expression,collectionName));
     }

     // We've got all the required items
     TupleStream stream = factory.constructStream(streamExpressions.get(0));
     StreamComparator comp = factory.constructComparator(((StreamExpressionValue)sortExpression.getParameter()).getValue(), FieldComparator.class);
     streamFactory = factory;
     init(zkHost,collectionName,stream,workersInt,comp);
   }

   private void init(String zkHost,String collection,TupleStream tupleStream,int workers,StreamComparator comp) throws IOException{
     this.zkHost = zkHost;
     this.collection = collection;
     this.workers = workers;
     this.comp = comp;
     this.tupleStream = tupleStream;

     // requires Expressible stream and comparator
     if(! (tupleStream instanceof Expressible)){
       throw new IOException("Unable to create ParallelStream with a non-expressible TupleStream.");
     }
   }

   @Override
   public StreamExpression toExpression(StreamFactory factory) throws IOException{
     return toExpression(factory, true);
   }

   private StreamExpression toExpression(StreamFactory factory, boolean includeStreams) throws IOException {
     // function name
     StreamExpression expression = new StreamExpression(factory.getFunctionName(this.getClass()));

     // collection
     expression.addParameter(collection);

     // workers
     expression.addParameter(new StreamExpressionNamedParameter("workers", Integer.toString(workers)));

     if(includeStreams){
       if(tupleStream instanceof Expressible){
         expression.addParameter(((Expressible)tupleStream).toExpression(factory));
       }
       else{
         throw new IOException("This ParallelStream contains a non-expressible TupleStream - it cannot be converted to an expression");
       }
     }
     else{
       expression.addParameter("<stream>");
     }

     // sort
     expression.addParameter(new StreamExpressionNamedParameter(SORT,comp.toExpression(factory)));

     // zkHost
     expression.addParameter(new StreamExpressionNamedParameter("zkHost", zkHost));

     return expression;
   }

   @Override
   public Explanation toExplanation(StreamFactory factory) throws IOException {

     StreamExplanation explanation = new StreamExplanation(getStreamNodeId().toString());

     explanation.setFunctionName(factory.getFunctionName(this.getClass()));
     explanation.setImplementingClass(this.getClass().getName());
     explanation.setExpressionType(ExpressionType.STREAM_DECORATOR);
     explanation.setExpression(toExpression(factory, false).toString());

     // add a child for each worker
     for(int idx = 0; idx < workers; ++idx){
       explanation.addChild(tupleStream.toExplanation(factory));
     }

     return explanation;
   }

   public List<TupleStream> children() {
     List<TupleStream> l = new ArrayList<>();
     l.add(tupleStream);
     return l;
   }

   public Tuple read() throws IOException {
     Tuple tuple = _read();

     if(tuple.EOF) {
       /*
       Map<String, Map> metrics = new HashMap();
       Iterator<Entry<String,Tuple>> it = this.eofTuples.entrySet().iterator();
       while(it.hasNext()) {
         Map.Entry<String, Tuple> entry = it.next();
         if(entry.getValue().fields.size() > 1) {
           metrics.put(entry.getKey(), entry.getValue().fields);
         }
       }

       if(metrics.size() > 0) {
         t.setMetrics(metrics);
       }
       */
       return Tuple.EOF();
     }

     return tuple;
   }

   public void setStreamContext(StreamContext streamContext) {
     this.streamContext = streamContext;
     if(streamFactory == null) {
       this.streamFactory = streamContext.getStreamFactory();
     }
     this.tupleStream.setStreamContext(streamContext);
   }

   protected void constructStreams() throws IOException {
     try {
       Object pushStream = ((Expressible) tupleStream).toExpression(streamFactory);

       List<String> shardUrls = getShards(this.zkHost, this.collection, this.streamContext);

       for(int w=0; w<workers; w++) {
         ModifiableSolrParams paramsLoc = new ModifiableSolrParams();
         paramsLoc.set(DISTRIB,"false"); // We are the aggregator.
         paramsLoc.set("numWorkers", workers);
         paramsLoc.set("workerID", w);

         paramsLoc.set("expr", pushStream.toString());
         paramsLoc.set("qt","/stream");

         String url = shardUrls.get(w);
         SolrStream solrStream = new SolrStream(url, paramsLoc);
         solrStream.setStreamContext(streamContext);
         solrStreams.add(solrStream);
       }

       assert(solrStreams.size() == workers);

     } catch (Exception e) {
       throw new IOException(e);
     }
   }
 }
	/*
	* 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.solr.client.solrj.io.stream;

	import java.io.IOException;
	import java.util.ArrayList;
	import java.util.List;
	import java.util.Locale;

	import org.apache.solr.client.solrj.io.Tuple;
	import org.apache.solr.client.solrj.io.comp.FieldComparator;
	import org.apache.solr.client.solrj.io.comp.StreamComparator;
	import org.apache.solr.client.solrj.io.stream.expr.Explanation;
	import org.apache.solr.client.solrj.io.stream.expr.Explanation.ExpressionType;
	import org.apache.solr.client.solrj.io.stream.expr.Expressible;
	import org.apache.solr.client.solrj.io.stream.expr.StreamExplanation;
	import org.apache.solr.client.solrj.io.stream.expr.StreamExpression;
	import org.apache.solr.client.solrj.io.stream.expr.StreamExpressionNamedParameter;
	import org.apache.solr.client.solrj.io.stream.expr.StreamExpressionValue;
	import org.apache.solr.client.solrj.io.stream.expr.StreamFactory;
	import org.apache.solr.common.params.ModifiableSolrParams;

	import static org.apache.solr.common.params.CommonParams.DISTRIB;
	import static org.apache.solr.common.params.CommonParams.SORT;

	/**
	* The ParallelStream decorates a TupleStream implementation and pushes it to N workers for parallel execution.
	* Workers are chosen from a SolrCloud collection.
	* Tuples that are streamed back from the workers are ordered by a Comparator.
	* @since 5.1.0
	**/
	public class ParallelStream extends CloudSolrStream implements Expressible {

	private TupleStream tupleStream;
	private int workers;
	private transient StreamFactory streamFactory;

	public ParallelStream(String zkHost,
	String collection,
	TupleStream tupleStream,
	int workers,
	StreamComparator comp) throws IOException {
	init(zkHost,collection,tupleStream,workers,comp);
	}


	public ParallelStream(String zkHost,
	String collection,
	String expressionString,
	int workers,
	StreamComparator comp) throws IOException {
	TupleStream tStream = this.streamFactory.constructStream(expressionString);
	init(zkHost,collection, tStream, workers,comp);
	}

	public void setStreamFactory(StreamFactory streamFactory) {
	this.streamFactory = streamFactory;
	}

	public ParallelStream(StreamExpression expression, StreamFactory factory) throws IOException {
	// grab all parameters out
	String collectionName = factory.getValueOperand(expression, 0);
	StreamExpressionNamedParameter workersParam = factory.getNamedOperand(expression, "workers");
	List<StreamExpression> streamExpressions = factory.getExpressionOperandsRepresentingTypes(expression, Expressible.class, TupleStream.class);
	StreamExpressionNamedParameter sortExpression = factory.getNamedOperand(expression, SORT);
	StreamExpressionNamedParameter zkHostExpression = factory.getNamedOperand(expression, "zkHost");

	// validate expression contains only what we want.

	if(expression.getParameters().size() != streamExpressions.size() + 3 + (null != zkHostExpression ? 1 : 0)){
	throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - unknown operands found", expression));
	}

	// Collection Name
	if(null == collectionName){
	throw new IOException(String.format(Locale.ROOT,"invalid expression %s - collectionName expected as first operand",expression));
	}

	// Workers
	if(null == workersParam \|\| null == workersParam.getParameter() \|\| !(workersParam.getParameter() instanceof StreamExpressionValue)){
	throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting a single 'workers' parameter of type positive integer but didn't find one",expression));
	}
	String workersStr = ((StreamExpressionValue)workersParam.getParameter()).getValue();
	int workersInt = 0;
	try{
	workersInt = Integer.parseInt(workersStr);
	if(workersInt <= 0){
	throw new IOException(String.format(Locale.ROOT,"invalid expression %s - workers '%s' must be greater than 0.",expression, workersStr));
	}
	}
	catch(NumberFormatException e){
	throw new IOException(String.format(Locale.ROOT,"invalid expression %s - workers '%s' is not a valid integer.",expression, workersStr));
	}

	// Stream
	if(1 != streamExpressions.size()){
	throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting a single stream but found %d",expression, streamExpressions.size()));
	}

	// Sort
	if(null == sortExpression \|\| !(sortExpression.getParameter() instanceof StreamExpressionValue)){
	throw new IOException(String.format(Locale.ROOT,"Invalid expression %s - expecting single 'sort' parameter telling us how to join the parallel streams but didn't find one",expression));
	}

	// zkHost, optional - if not provided then will look into factory list to get
	String zkHost = null;
	if(null == zkHostExpression){
	zkHost = factory.getCollectionZkHost(collectionName);
	if(zkHost == null) {
	zkHost = factory.getDefaultZkHost();
	}
	}
	else if(zkHostExpression.getParameter() instanceof StreamExpressionValue){
	zkHost = ((StreamExpressionValue)zkHostExpression.getParameter()).getValue();
	}
	if(null == zkHost){
	throw new IOException(String.format(Locale.ROOT,"invalid expression %s - zkHost not found for collection '%s'",expression,collectionName));
	}

	// We've got all the required items
	TupleStream stream = factory.constructStream(streamExpressions.get(0));
	StreamComparator comp = factory.constructComparator(((StreamExpressionValue)sortExpression.getParameter()).getValue(), FieldComparator.class);
	streamFactory = factory;
	init(zkHost,collectionName,stream,workersInt,comp);
	}

	private void init(String zkHost,String collection,TupleStream tupleStream,int workers,StreamComparator comp) throws IOException{
	this.zkHost = zkHost;
	this.collection = collection;
	this.workers = workers;
	this.comp = comp;
	this.tupleStream = tupleStream;

	// requires Expressible stream and comparator
	if(! (tupleStream instanceof Expressible)){
	throw new IOException("Unable to create ParallelStream with a non-expressible TupleStream.");
	}
	}

	@Override
	public StreamExpression toExpression(StreamFactory factory) throws IOException{
	return toExpression(factory, true);
	}

	private StreamExpression toExpression(StreamFactory factory, boolean includeStreams) throws IOException {
	// function name
	StreamExpression expression = new StreamExpression(factory.getFunctionName(this.getClass()));

	// collection
	expression.addParameter(collection);

	// workers
	expression.addParameter(new StreamExpressionNamedParameter("workers", Integer.toString(workers)));

	if(includeStreams){
	if(tupleStream instanceof Expressible){
	expression.addParameter(((Expressible)tupleStream).toExpression(factory));
	}
	else{
	throw new IOException("This ParallelStream contains a non-expressible TupleStream - it cannot be converted to an expression");
	}
	}
	else{
	expression.addParameter("<stream>");
	}

	// sort
	expression.addParameter(new StreamExpressionNamedParameter(SORT,comp.toExpression(factory)));

	// zkHost
	expression.addParameter(new StreamExpressionNamedParameter("zkHost", zkHost));

	return expression;
	}

	@Override
	public Explanation toExplanation(StreamFactory factory) throws IOException {

	StreamExplanation explanation = new StreamExplanation(getStreamNodeId().toString());

	explanation.setFunctionName(factory.getFunctionName(this.getClass()));
	explanation.setImplementingClass(this.getClass().getName());
	explanation.setExpressionType(ExpressionType.STREAM_DECORATOR);
	explanation.setExpression(toExpression(factory, false).toString());

	// add a child for each worker
	for(int idx = 0; idx < workers; ++idx){
	explanation.addChild(tupleStream.toExplanation(factory));
	}

	return explanation;
	}

	public List<TupleStream> children() {
	List<TupleStream> l = new ArrayList<>();
	l.add(tupleStream);
	return l;
	}

	public Tuple read() throws IOException {
	Tuple tuple = _read();

	if(tuple.EOF) {
	/*
	Map<String, Map> metrics = new HashMap();
	Iterator<Entry<String,Tuple>> it = this.eofTuples.entrySet().iterator();
	while(it.hasNext()) {
	Map.Entry<String, Tuple> entry = it.next();
	if(entry.getValue().fields.size() > 1) {
	metrics.put(entry.getKey(), entry.getValue().fields);
	}
	}

	if(metrics.size() > 0) {
	t.setMetrics(metrics);
	}
	*/
	return Tuple.EOF();
	}

	return tuple;
	}

	public void setStreamContext(StreamContext streamContext) {
	this.streamContext = streamContext;
	if(streamFactory == null) {
	this.streamFactory = streamContext.getStreamFactory();
	}
	this.tupleStream.setStreamContext(streamContext);
	}

	protected void constructStreams() throws IOException {
	try {
	Object pushStream = ((Expressible) tupleStream).toExpression(streamFactory);

	List<String> shardUrls = getShards(this.zkHost, this.collection, this.streamContext);

	for(int w=0; w<workers; w++) {
	ModifiableSolrParams paramsLoc = new ModifiableSolrParams();
	paramsLoc.set(DISTRIB,"false"); // We are the aggregator.
	paramsLoc.set("numWorkers", workers);
	paramsLoc.set("workerID", w);

	paramsLoc.set("expr", pushStream.toString());
	paramsLoc.set("qt","/stream");

	String url = shardUrls.get(w);
	SolrStream solrStream = new SolrStream(url, paramsLoc);
	solrStream.setStreamContext(streamContext);
	solrStreams.add(solrStream);
	}

	assert(solrStreams.size() == workers);

	} catch (Exception e) {
	throw new IOException(e);
	}
	}
	}