我在做Map缩小的工作。当我在单节点集群的机器上运行它时，输出如图所示

hduser@nikhil-VirtualBox:/usr/local/hadoop/hadoop-1.0.4$ bin/hadoop dfs -text /user/hduser/output16/part-r-00000
0   Required Genotype column (s), Must not contain NULLS for required fields, failed, 5, 1: GENE_NAME; 2: GENE_NAME; 4: GENE_NAME; 5: GENE_NAME; 9: GENE_NAME

然而，当我在一个更大的数据集上运行amazonemr时，我得到了以下所有奇怪的字符。原因可能是什么？

SEQorg.apache.hadoop.io.Textorg.apache.hadoop.io.Text\00\00\00\00\00\00\968\D6\FA\E1>X(.q\8B!\ABQ\00\00-\00\00\00
1537044153\8ERequired Genotype column (s), Must not contain NULLS for required fields, failed, 1, 1: VARIANT_START_POSITION; 2: VARIANT_START_POSITION;