OEV tool fails to read edit xml file if OP_TRUNCATE has BLOCK tag

    使用 HDFS OEV 命令处理 edits 文件,从xml格式的文件转成成binary格式的文件的时候,当xml文件中存在 OP_TRUNCATE 操作并且含有子 BLOCK的时候报错 

    我追踪了源码发现 blockFromXml 方法需要的是一个block 对象但是被传递的是一个 data对象,我已经解决了这个问题,并且验证了可用性,

     When edits files are processed with HDFS OEV command and converted from XML files to binary files, errors are reported when OP_TRUNCATE operation exists in XML files and BLOCKs are included.

    I tracked the source code and found that the blockFromXml method needed a block object but was passed a data object. I have solved this problem and verified its availability.

    I will submit a patch for this as soon as possible.