我正在使用ubuntu-12.04，hadoop-1.0.2，hive-0.10.0从hive中读取大约100万条记录的数据，我在下面得到了一个查询错误

select * from raw_pos limit 10000;
WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

所以我在$hadoop\u home/lib文件夹中安装了snappy for hadoop，它生成libsnappy.a、libsnappy.la、libsnappy.so、libsnappy.so.1、libsnappy.so.1.1.4文件
另外，在$hadoop\u home/lib/中添加hadoop-lzo-0.4.3.jar，并在cor site.xml、mapred-site.xml中做如下更改
核心站点。xml:-

<property>
    <name>fs.default.name</name>
    <value>hdfs://localhost:54310</value>
</property>

<property>
    <name>hadoop.tmp.dir</name>
    <value>/home/hadoop/apache/hadoop-1.0.4/hadoop_temp/</value>
    <description>A base for other temporary directories.</description>
</property>

<property>
<name>io.compression.codecs</name>
<value>
  org.apache.hadoop.io.compress.SnappyCodec
</value>

mapred-site.xml:-

<property>
    <name>mapred.job.tracker</name>
    <value>hdfs://localhost:54311</value>
</property>

<property>
  <name>mapred.compress.map.output</name>
 <value>true</value>
</property>

<property>
   <name>mapred.map.output.compression.codec</name>
   <value>org.apache.hadoop.io.compress.SnappyCodec</value>
</property>

但是当我开始做Hive的时候 show databases ，给出error:-

Failed with exception java.io.IOException:java.io.IOException: Cannot create an instance of InputFormat class org.apache.hadoop.mapred.TextInputFormat as specified in mapredWork!