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https://issues.apache.org/jira/browse/AVRO-1286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14063938#comment-14063938
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Scott Nottingham commented on AVRO-1286:
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I was just trying to challenge the OP comment that "Standard in is not 
seekable". Using the method I posted, something from the command line can be 
piped ( | ) to a python script as standard in and used by the DataFileReader 
constructor as if it were a file being read.  This could be useful in 
map/reduce jobs where Hadoop will try to send mapped data to a reduce python 
script as stdin. For a continuous stream ( as it sounds like you are describing 
) I don't think this method would work. 

> Python script avro cat should be able to read from stdin
> --------------------------------------------------------
>
>                 Key: AVRO-1286
>                 URL: https://issues.apache.org/jira/browse/AVRO-1286
>             Project: Avro
>          Issue Type: Bug
>          Components: python
>            Reporter: Uri Laserson
>            Priority: Minor
>
> Currently, you have to specify a target file on the command line.  But it 
> would be nice to be able to stream data through avro cat.



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