使用1.7.7会报一下的错误:

Error: Found interface org.apache.hadoop.mapreduce.TaskAttemptContext, but class was expected

使用1.7.4版本:

<dependency>
            <groupId>org.apache.avro</groupId>
            <artifactId>avro</artifactId>
            <version>1.7.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.avro</groupId>
            <artifactId>avro-mapred</artifactId>
            <version>1.7.4</version>
            <classifier>hadoop2</classifier>
        </dependency>