问题描述
我在HDFS上有一些文件，并尝试使用命令
I have some files on the HDFS, and I try to use command
hadoop fs -text filename | head -10
执行命令后，它总是返回前10行到终端，它是我想要什么，但总是返回一行text：无法写入输出流。
after exec the command, it always returns the first 10 lines to the terminal, and it's what I want, but it always returns a line "text: Unable to write to output stream." attached to it, I feel very confused about what the attached line means.
推荐答案
我假设您正在尝试读取压缩文件文件。无论如何 head 在它读取其限制之后关闭了流，因此，hadoop抛出了一个警告text：无法写入输出流。因为头已经关闭了hadoop的 text 试图写入的流。
I am assuming you are trying to read a compressed file. Anyhow head closed the stream after it read its limit hence, hadoop throw'ed a warning saying "text: Unable to write to output stream." because head has already closed the stream to which hadoop's text is trying to write to.
看看这个相关的。
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