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https://issues.apache.org/jira/browse/HDFS-3577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416186#comment-13416186
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Daryn Sharp commented on HDFS-3577:
-----------------------------------

If the content-length check is removed and content-length is not present, 
transfers >2GB will fail unless the client's read timeout is greater than the 
server's connection idle timeout (200s), and partial downloads will be 
considered successful.

I'd suggest the check be left in place on this jira, but it only generates an 
exception if it's not a chunked download.  We can then decide what to do on 
HDFS-3671. 
                
> WebHdfsFileSystem can not read files larger than 24KB
> -----------------------------------------------------
>
>                 Key: HDFS-3577
>                 URL: https://issues.apache.org/jira/browse/HDFS-3577
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.23.3, 2.0.0-alpha
>            Reporter: Alejandro Abdelnur
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Blocker
>         Attachments: h3577_20120705.patch, h3577_20120708.patch, 
> h3577_20120714.patch, h3577_20120716.patch
>
>
> If reading a file large enough for which the httpserver running 
> webhdfs/httpfs uses chunked transfer encoding (more than 24K in the case of 
> webhdfs), then the WebHdfsFileSystem client fails with an IOException with 
> message *Content-Length header is missing*.
> It looks like WebHdfsFileSystem is delegating opening of the inputstream to 
> *ByteRangeInputStream.URLOpener* class, which checks for the *Content-Length* 
> header, but when using chunked transfer encoding the *Content-Length* header 
> is not present and  the *URLOpener.openInputStream()* method thrown an 
> exception.

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