线上一个job出错，报错信息如下：
Diagnostic Messages for this Task: Error : java.io.IOException: java.io.EOFException: Unexpected end of input stream at org.apache.hadoop.hive.io.HiveIOExceptionHandlerChain.handleRecordReaderNextException(HiveIOExceptionHandlerChain.java:121) at org.apache.hadoop.hive.io.HiveIOExceptionHandlerUtil.handleRecordReaderNextException(HiveIOExceptionHandlerUtil.java:77) at org.apache.hadoop.hive.ql.io.HiveContextAwareRecordReader.doNext(HiveContextAwareRecordReader.java:276) at org.apache.hadoop.hive.ql.io.HiveRecordReader.doNext(HiveRecordReader.java:79) at org.apache.hadoop.hive.ql.io.HiveRecordReader.doNext(HiveRecordReader.java:33) at org.apache.hadoop.hive.ql.io.HiveContextAwareRecordReader.next(HiveContextAwareRecordReader.java:108) at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.moveToNext(MapTask.java:196) at org.apache.hadoop.mapred.MapTask$TrackedRecordReader.next(MapTask.java:182) at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:52) at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:428) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:340) at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:160) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:396) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1438) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:155) Caused by: java.io.EOFException: Unexpected end of input stream at org.apache.hadoop.io.compress.DecompressorStream.decompress(DecompressorStream.java:143) at org.apache.hadoop.io.compress.DecompressorStream.read(DecompressorStream.java:83) at java.io.InputStream.read(InputStream.java:82) at org.apache.hadoop.util.LineReader.readDefaultLine(LineReader.java:209) at org.apache.hadoop.util.LineReader.readLine(LineReader.java:173) at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:206) at org.apache.hadoop.mapred.LineRecordReader.next(LineRecordReader.java:45) at org.apache.hadoop.hive.ql.io.HiveContextAwareRecordReader.doNext(HiveContextAwareRecordReader.java:274) ... 13 more
从报错信息来看，是和io读取有关系的，即在map阶段，数据读取出错导致。
通过explain extended查看读取的文件，因为是text的gz文件，使用zcat进行测试，最终定位到是由于gz文件异常导致。将有问题的数据删除后job恢复。
