Github user jackylk commented on a diff in the pull request:
https://github.com/apache/incubator-carbondata/pull/240#discussion_r84236755
--- Diff:
processing/src/main/java/org/apache/carbondata/processing/newflow/steps/input/InputProcessorStepImpl.java
---
@@ -0,0 +1,171 @@
+package org.apache.carbondata.processing.newflow.steps.input;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import org.apache.carbondata.common.CarbonIterator;
+import org.apache.carbondata.common.logging.LogService;
+import org.apache.carbondata.common.logging.LogServiceFactory;
+import org.apache.carbondata.core.constants.CarbonCommonConstants;
+import org.apache.carbondata.core.util.CarbonProperties;
+import
org.apache.carbondata.processing.newflow.AbstractDataLoadProcessorStep;
+import
org.apache.carbondata.processing.newflow.CarbonDataLoadConfiguration;
+import org.apache.carbondata.processing.newflow.DataField;
+import
org.apache.carbondata.processing.newflow.constants.DataLoadProcessorConstants;
+import
org.apache.carbondata.processing.newflow.exception.CarbonDataLoadingException;
+import org.apache.carbondata.processing.newflow.parser.CarbonParserFactory;
+import org.apache.carbondata.processing.newflow.parser.GenericParser;
+import org.apache.carbondata.processing.newflow.row.CarbonRow;
+import org.apache.carbondata.processing.newflow.row.CarbonRowBatch;
+
+/**
+ * It reads data from record reader and sends data to next step.
+ */
+public class InputProcessorStepImpl extends AbstractDataLoadProcessorStep {
+
+ private static final LogService LOGGER =
+
LogServiceFactory.getLogService(InputProcessorStepImpl.class.getName());
+
+ private GenericParser[] genericParsers;
+
+ private List<Iterator<Object[]>> inputIterators;
+
+ public InputProcessorStepImpl(CarbonDataLoadConfiguration configuration,
+ AbstractDataLoadProcessorStep child, List<Iterator<Object[]>>
inputIterators) {
+ super(configuration, child);
+ this.inputIterators = inputIterators;
+ }
+
+ @Override public DataField[] getOutput() {
+ DataField[] fields = configuration.getDataFields();
+ String[] header = configuration.getHeader();
+ DataField[] output = new DataField[fields.length];
+ int k = 0;
+ for (int i = 0; i < header.length; i++) {
+ for (int j = 0; j < fields.length; j++) {
+ if
(header[j].equalsIgnoreCase(fields[j].getColumn().getColName())) {
+ output[k++] = fields[j];
+ break;
+ }
+ }
+ }
+ return output;
+ }
+
+ @Override public void initialize() throws CarbonDataLoadingException {
+ DataField[] output = getOutput();
+ genericParsers = new GenericParser[output.length];
+ for (int i = 0; i < genericParsers.length; i++) {
+ genericParsers[i] =
CarbonParserFactory.createParser(output[i].getColumn(),
+ (String[]) configuration
+
.getDataLoadProperty(DataLoadProcessorConstants.COMPLEX_DELIMITERS));
+ }
+ }
+
+ private int getNumberOfCores() {
+ int numberOfCores;
+ try {
+ numberOfCores = Integer.parseInt(CarbonProperties.getInstance()
+ .getProperty(CarbonCommonConstants.NUM_CORES_LOADING,
+ CarbonCommonConstants.NUM_CORES_DEFAULT_VAL));
+ } catch (NumberFormatException exc) {
+ numberOfCores =
Integer.parseInt(CarbonCommonConstants.NUM_CORES_DEFAULT_VAL);
+ }
+ return numberOfCores;
+ }
+
+ private int getBatchSize() {
+ int batchSize;
+ try {
+ batchSize = Integer.parseInt(configuration
+
.getDataLoadProperty(DataLoadProcessorConstants.DATA_LOAD_BATCH_SIZE,
+
DataLoadProcessorConstants.DATA_LOAD_BATCH_SIZE_DEFAULT).toString());
+ } catch (NumberFormatException exc) {
+ batchSize =
Integer.parseInt(DataLoadProcessorConstants.DATA_LOAD_BATCH_SIZE_DEFAULT);
+ }
+ return batchSize;
+ }
+
+ @Override public Iterator<CarbonRowBatch>[] execute() {
+ int batchSize = getBatchSize();
+ List<Iterator<Object[]>>[] readerIterators =
partitionInputReaderIterators();
+ Iterator<CarbonRowBatch>[] outIterators = new
Iterator[readerIterators.length];
+ for (int i = 0; i < outIterators.length; i++) {
+ outIterators[i] = new InputProcessorIterator(readerIterators[i],
genericParsers, batchSize);
+ }
+ return outIterators;
+ }
+
+ private List<Iterator<Object[]>>[] partitionInputReaderIterators() {
+ int numberOfCores = getNumberOfCores();
+ if (inputIterators.size() < numberOfCores) {
+ numberOfCores = inputIterators.size();
+ }
+ List<Iterator<Object[]>>[] iterators = new List[numberOfCores];
+ for (int i = 0; i < numberOfCores; i++) {
+ iterators[i] = new ArrayList<>();
+ }
+
+ for (int i = 0; i < inputIterators.size(); i++) {
+ iterators[i % numberOfCores].add(inputIterators.get(i));
+
+ }
+ return iterators;
+ }
+
+ @Override protected CarbonRow processRow(CarbonRow row) {
+ return null;
+ }
+
+ private static class InputProcessorIterator extends
CarbonIterator<CarbonRowBatch> {
+
+ private List<Iterator<Object[]>> inputIterators;
+
+ private GenericParser[] genericParsers;
+
+ private Iterator<Object[]> currentIterator;
+
+ private int counter;
+
+ private int batchSize;
+
+ public InputProcessorIterator(List<Iterator<Object[]>> inputIterators,
--- End diff --
please add description comment to this class
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