title: Solr dedup error Failed with exit value 255
body: <p>I am crawling few data from web using apache nutch 2.3. My solr version is 4.10.3. Data is crawled successfully in hbase and indexed also in solr but at end (dedup stage ) Follwoing error appears in console;</p>
  
  <pre><code>IndexingJob: done.
  SOLR dedup -&gt; http://solr:8983/solr
  /home/crawler/nutch-2.3/bin/nutch solrdedup -D mapred.reduce.tasks=2 -D mapred.child.java.opts=-Xmx1000m -D mapred.reduce.tasks.speculative.execution=false -D mapred.map.tasks.speculative.execution=false -D mapred.compress.map.output=true http://solr:8983/solr
  Error running:
    /home/crawler/nutch-2.3/bin/nutch solrdedup -D mapred.reduce.tasks=2 -D mapred.child.java.opts=-Xmx1000m -D mapred.reduce.tasks.speculative.execution=false -D mapred.map.tasks.speculative.execution=false -D mapred.compress.map.output=true http://solr:8983/solr
  Failed with exit value 255.
  </code></pre>
  
  <p>Where solr is IP of a machine running apache solr. In apache nutch log file corresponding error ( in details is following)</p>
  
  <pre><code>2015-01-28 10:39:47,830 WARN  mapred.FileOutputCommitter - Output path is null in cleanup
  2015-01-28 10:39:47,830 WARN  mapred.LocalJobRunner - job_local345700287_0001
  java.lang.Exception: java.lang.NullPointerException
          at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:354)
  Caused by: java.lang.NullPointerException
          at org.apache.hadoop.io.Text.encode(Text.java:388)
          at org.apache.hadoop.io.Text.set(Text.java:178)
          at org.apache.nutch.indexer.solr.SolrDeleteDuplicates$SolrRecordReader.nextKeyValue(SolrDeleteDuplicates.java:233)
          at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:531)
          at org.apache.hadoop.mapreduce.MapContext.nextKeyValue(MapContext.java:67)
          at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:144)
          at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
          at org.apache.hadoop.mapred.MapTask.run(MapTask.java:364)
          at org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:223)
          at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
          at java.util.concurrent.FutureTask.run(FutureTask.java:266)
          at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
          at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
          at java.lang.Thread.run(Thread.java:745)
  </code></pre>
  
  <p>What is the problem with nutch or solr? How to SOlve it?</p>