这个 job的  具体和 nutch1.2 index http://chengqianl.iteye.com/admin/blogs/1597617一样
IndexerMapReduce.initMRJob(crawlDb, linkDb, segments, job);

唯一不同的是writer是设置的 SolrWriter
它的open方法 如下粗体部分通过solrj，new了一个CommonsHttpSolrServer
public void open(JobConf job, String name) throws IOException {
    solr = new CommonsHttpSolrServer(job.get(SolrConstants.SERVER_URL)); 
   commitSize = job.getInt(SolrConstants.COMMIT_SIZE, 1000);
    solrMapping = SolrMappingReader.getInstance(job);
  }

它的write方法如下，粗体部分是把数据写入solr

  public void write(NutchDocument doc) throws IOException {
    final SolrInputDocument inputDoc = new SolrInputDocument();
    for(final Entry<String, NutchField> e : doc) {
      for (final Object val : e.getValue().getValues()) {
        inputDoc.addField(solrMapping.mapKey(e.getKey()), val, e.getValue().getWeight());
        String sCopy = solrMapping.mapCopyKey(e.getKey());
        if (sCopy != e.getKey()) {
        inputDoc.addField(sCopy, val, e.getValue().getWeight());
        }
      }
    }
    inputDoc.setDocumentBoost(doc.getWeight());
    inputDocs.add(inputDoc);
    if (inputDocs.size() > commitSize) {
      try {
       solr.add(inputDocs);    
       } catch (final SolrServerException e) {

        throw makeIOException(e);
      }
      inputDocs.clear();
    }
  }