Elasticsearch Transport客户端Java客户端

Question

I'm trying to rebuild a plugin that talks to elasticsearch 2.4 to work with Elasticsearch 5.

The code is from:: https://github.com/pentaho/pentaho-kettle/blob/master/plugins/elasticsearch-bulk-insert/src/org/pentaho/di/trans/steps/elasticsearchbulk/ElasticSearchBulk.java

Here is the code:

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 *
 * Copyright (C) 2002-2016 by Pentaho : http://www.pentaho.com
 *
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 *
 * Licensed 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
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 * 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
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package org.pentaho.di.trans.steps.elasticsearchbulk;

import java.io.IOException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import org.apache.commons.lang.StringUtils;
import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.ElasticsearchTimeoutException;
import org.elasticsearch.action.ListenableActionFuture;
import org.elasticsearch.action.bulk.BulkItemResponse;
import org.elasticsearch.action.bulk.BulkRequestBuilder;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexRequest.OpType;
import org.elasticsearch.action.index.IndexRequestBuilder;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.NoNodeAvailableException;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.node.Node;
import org.elasticsearch.node.NodeBuilder;
import org.pentaho.di.core.exception.KettleException;
import org.pentaho.di.core.exception.KettleStepException;
import org.pentaho.di.core.row.RowDataUtil;
import org.pentaho.di.core.row.RowMetaInterface;
import org.pentaho.di.core.row.ValueMetaInterface;
import org.pentaho.di.i18n.BaseMessages;
import org.pentaho.di.trans.Trans;
import org.pentaho.di.trans.TransMeta;
import org.pentaho.di.trans.step.BaseStep;
import org.pentaho.di.trans.step.StepDataInterface;
import org.pentaho.di.trans.step.StepInterface;
import org.pentaho.di.trans.step.StepMeta;
import org.pentaho.di.trans.step.StepMetaInterface;

/**
 * Does bulk insert of data into ElasticSearch
 *
 * @author webdetails
 * @since 16-02-2011
 */
public class ElasticSearchBulk extends BaseStep implements StepInterface {

  private static final String INSERT_ERROR_CODE = null;
  private static Class<?> PKG = ElasticSearchBulkMeta.class; // for i18n
  private ElasticSearchBulkMeta meta;
  private ElasticSearchBulkData data;

  TransportClient tc;

  private Node node;
  private Client client;
  private String index;
  private String type;

  BulkRequestBuilder currentRequest;

  private int batchSize = 2;

  private boolean isJsonInsert = false;
  private int jsonFieldIdx = 0;

  private String idOutFieldName = null;
  private Integer idFieldIndex = null;

  private Long timeout = null;
  private TimeUnit timeoutUnit = TimeUnit.MILLISECONDS;

  // private long duration = 0L;
  private int numberOfErrors = 0;

  private List<IndexRequestBuilder> requestsBuffer;

  private boolean stopOnError = true;
  private boolean useOutput = true;

  private Map<String, String> columnsToJson;
  private boolean hasFields;

  private IndexRequest.OpType opType = OpType.CREATE;

  public ElasticSearchBulk( StepMeta stepMeta, StepDataInterface stepDataInterface, int copyNr, TransMeta transMeta,
      Trans trans ) {
    super( stepMeta, stepDataInterface, copyNr, transMeta, trans );
  }

  public boolean processRow( StepMetaInterface smi, StepDataInterface sdi ) throws KettleException {

    Object[] rowData = getRow();
    if ( rowData == null ) {
      if ( currentRequest != null && currentRequest.numberOfActions() > 0 ) {
        // didn't fill a whole batch
        processBatch( false );
      }
      setOutputDone();
      return false;
    }

    if ( first ) {
      first = false;
      setupData();
      currentRequest = client.prepareBulk();
      requestsBuffer = new ArrayList<IndexRequestBuilder>( this.batchSize );
      initFieldIndexes();
    }

    try {
      data.inputRowBuffer[data.nextBufferRowIdx++] = rowData;
      return indexRow( data.inputRowMeta, rowData ) || !stopOnError;
    } catch ( KettleStepException e ) {
      throw e;
    } catch ( Exception e ) {
      rejectAllRows( e.getLocalizedMessage() );
      String msg = BaseMessages.getString( PKG, "ElasticSearchBulk.Log.Exception", e.getLocalizedMessage() );
      logError( msg );
      throw new KettleStepException( msg, e );
    }
  }

  /**
   * Initialize <code>this.data</code>
   *
   * @throws KettleStepException
   */
  private void setupData() throws KettleStepException {
    data.nextBufferRowIdx = 0;
    data.inputRowMeta = getInputRowMeta().clone(); // only available after first getRow();
    data.inputRowBuffer = new Object[batchSize][];
    data.outputRowMeta = data.inputRowMeta.clone();
    meta.getFields( data.outputRowMeta, getStepname(), null, null, this, repository, metaStore );
  }

  private void initFieldIndexes() throws KettleStepException {
    if ( isJsonInsert ) {
      Integer idx = getFieldIdx( data.inputRowMeta, environmentSubstitute( meta.getJsonField() ) );
      if ( idx != null ) {
        jsonFieldIdx = idx.intValue();
      } else {
        throw new KettleStepException( BaseMessages.getString( PKG, "ElasticSearchBulk.Error.NoJsonField" ) );
      }
    }

    idOutFieldName = environmentSubstitute( meta.getIdOutField() );

    if ( StringUtils.isNotBlank( meta.getIdInField() ) ) {
      idFieldIndex = getFieldIdx( data.inputRowMeta, environmentSubstitute( meta.getIdInField() ) );
      if ( idFieldIndex == null ) {
        throw new KettleStepException( BaseMessages.getString( PKG, "ElasticSearchBulk.Error.InvalidIdField" ) );
      }
    } else {
      idFieldIndex = null;
    }
  }

  private static Integer getFieldIdx( RowMetaInterface rowMeta, String fieldName ) {
    if ( fieldName == null ) {
      return null;
    }

    for ( int i = 0; i < rowMeta.size(); i++ ) {
      String name = rowMeta.getValueMeta( i ).getName();
      if ( fieldName.equals( name ) ) {
        return i;
      }
    }
    return null;
  }

  /**
   * @param rowMeta
   *          The metadata for the row to be indexed
   * @param row
   *          The data for the row to be indexed
   */

  private boolean indexRow( RowMetaInterface rowMeta, Object[] row ) throws KettleStepException {
    try {

      IndexRequestBuilder requestBuilder = client.prepareIndex( index, type );
      requestBuilder.setOpType( this.opType );

      if ( idFieldIndex != null ) {
        requestBuilder.setId( "" + row[idFieldIndex] ); // "" just in case field isn't string
      }

      if ( isJsonInsert ) {
        addSourceFromJsonString( row, requestBuilder );
      } else {
        addSourceFromRowFields( requestBuilder, rowMeta, row );
      }

      currentRequest.add( requestBuilder );
      requestsBuffer.add( requestBuilder );

      if ( currentRequest.numberOfActions() >= batchSize ) {
        return processBatch( true );
      } else {
        return true;
      }

    } catch ( KettleStepException e ) {
      throw e;
    } catch ( NoNodeAvailableException e ) {
      throw new KettleStepException( BaseMessages.getString( PKG, "ElasticSearchBulkDialog.Error.NoNodesFound" ) );
    } catch ( Exception e ) {
      throw new KettleStepException( BaseMessages.getString( PKG, "ElasticSearchBulk.Log.Exception", e
          .getLocalizedMessage() ), e );
    }
  }

  /**
   * @param row
   * @param requestBuilder
   */
  private void addSourceFromJsonString( Object[] row, IndexRequestBuilder requestBuilder ) throws KettleStepException {
    Object jsonString = row[jsonFieldIdx];
    if ( jsonString instanceof byte[] ) {
      requestBuilder.setSource( (byte[]) jsonString );
    } else if ( jsonString instanceof String ) {
      requestBuilder.setSource( ( (String) jsonString ).getBytes() );
    } else {
      throw new KettleStepException( BaseMessages.getString( "ElasticSearchBulk.Error.NoJsonFieldFormat" ) );
    }
  }

  /**
   * @param requestBuilder
   * @param rowMeta
   * @param row
   * @throws IOException
   */
  private void addSourceFromRowFields( IndexRequestBuilder requestBuilder, RowMetaInterface rowMeta, Object[] row )
    throws IOException {
    XContentBuilder jsonBuilder = XContentFactory.jsonBuilder().startObject();

    for ( int i = 0; i < rowMeta.size(); i++ ) {
      if ( idFieldIndex != null && i == idFieldIndex ) { // skip id
        continue;
      }

      ValueMetaInterface valueMeta = rowMeta.getValueMeta( i );
      String name = hasFields ? columnsToJson.get( valueMeta.getName() ) : valueMeta.getName();
      Object value = row[i];
      if ( value instanceof Date && value.getClass() != Date.class ) {
        Date subDate = (Date) value;
        // create a genuine Date object, or jsonBuilder will not recognize it
        value = new Date( subDate.getTime() );
      }
      if ( StringUtils.isNotBlank( name ) ) {
        jsonBuilder.field( name, value );
      }
    }

    jsonBuilder.endObject();
    requestBuilder.setSource( jsonBuilder );
  }

  public boolean init( StepMetaInterface smi, StepDataInterface sdi ) {
    meta = (ElasticSearchBulkMeta) smi;
    data = (ElasticSearchBulkData) sdi;

    if ( super.init( smi, sdi ) ) {

      try {

        numberOfErrors = 0;

        initFromMeta();
        initClient();

        return true;

      } catch ( Exception e ) {
        logError( BaseMessages.getString( PKG, "ElasticSearchBulk.Log.ErrorOccurredDuringStepInitialize" )
            + e.getMessage() );
      }
      return true;
    }
    return false;
  }

  private void initFromMeta() {
    index = environmentSubstitute( meta.getIndex() );
    type = environmentSubstitute( meta.getType() );
    batchSize = meta.getBatchSizeInt( this );
    try {
      timeout = Long.parseLong( environmentSubstitute( meta.getTimeOut() ) );
    } catch ( NumberFormatException e ) {
      timeout = null;
    }
    timeoutUnit = meta.getTimeoutUnit();
    isJsonInsert = meta.isJsonInsert();
    useOutput = meta.isUseOutput();
    stopOnError = meta.isStopOnError();

    columnsToJson = meta.getFieldsMap();
    this.hasFields = columnsToJson.size() > 0;

    this.opType =
        StringUtils.isNotBlank( meta.getIdInField() ) && meta.isOverWriteIfSameId() ? OpType.INDEX : OpType.CREATE;

  }

  private boolean processBatch( boolean makeNew ) throws KettleStepException {

    ListenableActionFuture<BulkResponse> actionFuture = currentRequest.execute();
    boolean responseOk = false;

    BulkResponse response = null;
    try {
      if ( timeout != null && timeoutUnit != null ) {
        response = actionFuture.actionGet( timeout, timeoutUnit );
      } else {
        response = actionFuture.actionGet();
      }
    } catch ( ElasticsearchException e ) {
      String msg = BaseMessages.getString( PKG, "ElasticSearchBulk.Error.BatchExecuteFail", e.getLocalizedMessage() );
      if ( e instanceof ElasticsearchTimeoutException ) {
        msg = BaseMessages.getString( PKG, "ElasticSearchBulk.Error.Timeout" );
      }
      logError( msg );
      rejectAllRows( msg );
    }

    if ( response != null ) {
      responseOk = handleResponse( response );
      requestsBuffer.clear();
    } else { // have to assume all failed
      numberOfErrors += currentRequest.numberOfActions();
      setErrors( numberOfErrors );
    }
    // duration += response.getTookInMillis(); //just in trunk..

    if ( makeNew ) {
      currentRequest = client.prepareBulk();
      data.nextBufferRowIdx = 0;
      data.inputRowBuffer = new Object[batchSize][];
    } else {
      currentRequest = null;
      data.inputRowBuffer = null;
    }

    return responseOk;
  }

  /**
   * @param response
   * @return <code>true</code> if no errors
   */
  private boolean handleResponse( BulkResponse response ) {

    boolean hasErrors = response.hasFailures();

    if ( hasErrors ) {
      logError( response.buildFailureMessage() );
    }

    int errorsInBatch = 0;

    if ( hasErrors || useOutput ) {
      for ( BulkItemResponse item : response ) {
        if ( item.isFailed() ) {
          // log
          logDetailed( item.getFailureMessage() );
          errorsInBatch++;
          if ( getStepMeta().isDoingErrorHandling() ) {
            rejectRow( item.getItemId(), item.getFailureMessage() );
          }
        } else if ( useOutput ) {
          if ( idOutFieldName != null ) {
            addIdToRow( item.getId(), item.getItemId() );
          }
          echoRow( item.getItemId() );
        }
      }
    }

    numberOfErrors += errorsInBatch;
    setErrors( numberOfErrors );
    int linesOK = currentRequest.numberOfActions() - errorsInBatch;

    if ( useOutput ) {
      setLinesOutput( getLinesOutput() + linesOK );
    } else {
      setLinesWritten( getLinesWritten() + linesOK );
    }

    return !hasErrors;
  }

  private void addIdToRow( String id, int rowIndex ) {

    data.inputRowBuffer[rowIndex] =
        RowDataUtil.resizeArray( data.inputRowBuffer[rowIndex], getInputRowMeta().size() + 1 );
    data.inputRowBuffer[rowIndex][getInputRowMeta().size()] = id;

  }

  /**
   * Send input row to output
   *
   * @param rowIndex
   */
  private void echoRow( int rowIndex ) {
    try {

      putRow( data.outputRowMeta, data.inputRowBuffer[rowIndex] );

    } catch ( KettleStepException e ) {
      logError( e.getLocalizedMessage() );
    } catch ( ArrayIndexOutOfBoundsException e ) {
      logError( e.getLocalizedMessage() );
    }
  }

  /**
   * Send input row to error.
   *
   * @param index
   * @param errorMsg
   */
  private void rejectRow( int index, String errorMsg ) {
    try {

      putError( getInputRowMeta(), data.inputRowBuffer[index], 1, errorMsg, null, INSERT_ERROR_CODE );

    } catch ( KettleStepException e ) {
      logError( e.getLocalizedMessage() );
    } catch ( ArrayIndexOutOfBoundsException e ) {
      logError( e.getLocalizedMessage() );
    }
  }

  private void rejectAllRows( String errorMsg ) {
    for ( int i = 0; i < data.nextBufferRowIdx; i++ ) {
      rejectRow( i, errorMsg );
    }
  }

  private void initClient() throws UnknownHostException {
    Settings.Builder settingsBuilder = Settings.builder();
    settingsBuilder.put( Settings.Builder.EMPTY_SETTINGS ); // keep default classloader
    settingsBuilder.put( meta.getSettingsMap() );
    // Settings settings = settingsBuilder.build();
    TransportClient.Builder tClientBuilder = TransportClient.builder().settings( settingsBuilder );

    if ( !meta.servers.isEmpty() ) {
      node = null;
      TransportClient tClient = tClientBuilder.build();
      for ( ElasticSearchBulkMeta.Server s : meta.servers ) {
        tClient.addTransportAddress( s.getAddr() );
      }
      client = tClient;
    } else {
      NodeBuilder nodeBuilder = NodeBuilder.nodeBuilder();
      nodeBuilder.settings( settingsBuilder );
      node = nodeBuilder.client( true ).node(); // this node will not hold data
      client = node.client();
      node.start();
    }
  }

  private void disposeClient() {

    if ( client != null ) {
      client.close();
    }
    if ( node != null ) {
      node.close();
    }

  }

  public void dispose( StepMetaInterface smi, StepDataInterface sdi ) {
    meta = (ElasticSearchBulkMeta) smi;
    data = (ElasticSearchBulkData) sdi;
    try {
      disposeClient();
    } catch ( Exception e ) {
      logError( e.getLocalizedMessage(), e );
    }
    super.dispose( smi, sdi );
  }
}

I understand that Elastic have move the transport client to a new module with Elastic 5. I'm fairly new to JAVA, although I have years of experience with other languages, so I'm hoping that this is not too complicated.

When I try to build the code with ant I get the following errors:

TranportClient.Builder tclientbuilder = TransportClient.build.()settings(settingsBuilder);

symbol not found pointing to the builder method for TransportClient

What does this mean? Does it mean that the transport client was not imported in the imports?

I've tried to understand that elasticsearch documentation on this:

https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/transport-client.html

It appears that I need to use the new:

PreBuiltTransportClient(settings);

However this also gives a symbol not found error related to the PreBuiltTransportClient.

This is using the latest elastic-5.2.1 jar source.

Any ideas how I can get this to build?

Thanks!

Answer 1

You have the period in the wrong position. It should be:

TranportClient.Builder tclientbuilder = TransportClient.build().settings(settingsBuilder);

Answer 2

make sure that you are getting all dependencies, and the child dependencies (not only elasticSearch jar), use maven, ivy etc for getting the dependencies tree.

in ivy for example :

 <!-- https://mvnrepository.com/artifact/org.elasticsearch.client/transport -->
  <dependency org="org.elasticsearch.client" name="transport" rev="5.4.1"  conf="default"/>

//--------------------- then in a class you can call:

 TransportClient client;

    client = new PreBuiltTransportClient(Settings.EMPTY).addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));