title: Cassandra InvalidRequestException(why:[MyKeyspace][MyColumnFamily][6675...6c74] = [6c86......e65720] failed validation (String didn't validate.))
body: <p>I am using Cassandra with Hadoop for input and output. During the output reduce job, I got an error:</p>
  
  <pre><code>2011-08-10 03:54:04,326 WARN org.apache.hadoop.mapred.Child: Error running child
  java.io.IOException: InvalidRequestException(why:[MyKeyspace][MyColumnFamily][66756c6c74657874] = [6c696e6bb66e68656974207a756d.................65697465726520536f6e67746578746520] failed    validation (String didn't validate.))
  at org.apache.cassandra.thrift.Cassandra$batch_mutate_result.read(Cassandra.java:19045)
  at org.apache.cassandra.thrift.Cassandra$Client.recv_batch_mutate(Cassandra.java:1035)
  at org.apache.cassandra.thrift.Cassandra$Client.batch_mutate(Cassandra.java:1009)
  at   org.apache.cassandra.hadoop.ColumnFamilyRecordWriter$RangeClient.run(ColumnFamilyRecordWriter.java:285)
  2011-08-10 03:54:04,339 INFO org.apache.hadoop.mapred.Task: Runnning cleanup for the task
  2011-08-10 03:54:04,340 WARN org.apache.hadoop.io.UTF8: truncating long string: 267364 chars, starting with java.io.IOException:
  </code></pre>
  
  <p>According to the log, this happens not in the beginning, but after successful merging, sorting, and processing of 8981 keys. On 8982th it fails.</p>
  
  <p>Have searched in google and on stackoverflow, but nothig found.</p>
  
  <p>Column family is like this:</p>
  
  <pre><code>create column family MyColumnFamily with comparator = UTF8Type and                                                                                        
  key_validation_class=UTF8Type and 
  column_metadata = 
  [
  {column_name: column1, validation_class: UTF8Type, index_type: 0},
  {column_name: column2, validation_class: UTF8Type, index_type: 0},
  {column_name: column3, validation_class: UTF8Type, index_type: 0}
  ];
  </code></pre>
  
  <p>Thank you in advance!</p>