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https://issues.apache.org/jira/browse/KNOX-767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15630457#comment-15630457
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Sumit Gupta commented on KNOX-767:
----------------------------------
BTW, I think that the real fix for this issue is bypassing the xmlfilterreader
entirely if there is no rules or filters to be applied to the body. Basically
the noop filter reader path.
> Knox transforms XML files written to WebHDFS
> --------------------------------------------
>
> Key: KNOX-767
> URL: https://issues.apache.org/jira/browse/KNOX-767
> Project: Apache Knox
> Issue Type: Bug
> Reporter: Sumit Gupta
> Assignee: Jeffrey E Rodriguez
> Fix For: 0.11.0
>
> Attachments: KNOX-767.patch
>
>
> When you write an XML file to WebHDFS through Knox with the Content-Type
> header set to text/xml or application/xml it is transformed by Knox so that
> empty tags like <xyz/> are written as <xyz></xyz> and CDATA is interpreted.
> This does not happen if written directly to WebHDFS. For example:
> {code}
> [root@hdp250 ~]# cat xxx
> <document>
> <empty/>
> <![CDATA[<xyz>wibble</xyz>]]>
> </document>
> [root@hdp250 ~]# curl -u guest:guest-password -i -k -X PUT
> "https://hdp250.local:8443/gateway/default/webhdfs/v1/tmp/xxx?op=CREATE&overwrite=true";
> HTTP/1.1 307 Temporary Redirect
> Date: Thu, 27 Oct 2016 19:25:35 GMT
> Set-Cookie:
> JSESSIONID=bt3timb9jl7k546fcntrj8s;Path=/gateway/default;Secure;HttpOnly
> Expires: Thu, 01 Jan 1970 00:00:00 GMT
> Set-Cookie: rememberMe=deleteMe; Path=/gateway/default; Max-Age=0;
> Expires=Wed, 26-Oct-2016 19:25:35 GMT
> Cache-Control: no-cache
> Expires: Thu, 27 Oct 2016 19:25:35 GMT
> Date: Thu, 27 Oct 2016 19:25:35 GMT
> Pragma: no-cache
> Expires: Thu, 27 Oct 2016 19:25:35 GMT
> Date: Thu, 27 Oct 2016 19:25:35 GMT
> Pragma: no-cache
> Content-Type: application/octet-stream
> X-FRAME-OPTIONS: SAMEORIGIN
> Location:
> https://hdp250.local:8443/gateway/default/webhdfs/data/v1/webhdfs/v1/tmp/xxx?_=AAAACAAAABAAAAEQ-XO5sAM86ubmjRdUYXJEZkpM4Vdv3vmIprBetQwfaKaZNN4uc9O1IN8jujDD9GpPPCDJCKxebul_GlCFxDIZzbkhZ1tnhY5rZ6V12SVJgLo5DxMxC8zECeaM4M8OFLqHxamNnvduuUkD5y23RJczzHHJ9SyYuG6yiCpDJKB_5MffZIWFaEEcYM7jOkjStZHU_7cjIg_vRJL2nFCVTWKf1FPkB00QCbXHN-Ua6MfEG8p2aoQB70tfVHnmhhnBWx2PZARJ-kHp42rrpA1yrI86v3Q-OGI4Ya3pnPRWhPj0wbdDr_p_FDinsw2KRu1_aRSIXXznmJ--aX6TflbBGZvDImkw4x0QM48UGFpOChaLtHk73rlMMUbbbAwOew0gJ2-69PuXiL4QB48
> Server: Jetty(6.1.26.hwx)
> Content-Length: 0
> [root@hdp250 ~]# curl -u guest:guest-password -i -k -X PUT -T xxx -H
> 'Content-Type: text/xml'
> "https://hdp250.local:8443/gateway/default/webhdfs/data/v1/webhdfs/v1/tmp/xxx?_=AAAACAAAABAAAAEQ-XO5sAM86ubmjRdUYXJEZkpM4Vdv3vmIprBetQwfaKaZNN4uc9O1IN8jujDD9GpPPCDJCKxebul_GlCFxDIZzbkhZ1tnhY5rZ6V12SVJgLo5DxMxC8zECeaM4M8OFLqHxamNnvduuUkD5y23RJczzHHJ9SyYuG6yiCpDJKB_5MffZIWFaEEcYM7jOkjStZHU_7cjIg_vRJL2nFCVTWKf1FPkB00QCbXHN-Ua6MfEG8p2aoQB70tfVHnmhhnBWx2PZARJ-kHp42rrpA1yrI86v3Q-OGI4Ya3pnPRWhPj0wbdDr_p_FDinsw2KRu1_aRSIXXznmJ--aX6TflbBGZvDImkw4x0QM48UGFpOChaLtHk73rlMMUbbbAwOew0gJ2-69PuXiL4QB48";
> HTTP/1.1 100 Continue
> HTTP/1.1 201 Created
> Date: Thu, 27 Oct 2016 19:25:54 GMT
> Set-Cookie:
> JSESSIONID=3o27jby7c2a6mdpxducddqac;Path=/gateway/default;Secure;HttpOnly
> Expires: Thu, 01 Jan 1970 00:00:00 GMT
> Set-Cookie: rememberMe=deleteMe; Path=/gateway/default; Max-Age=0;
> Expires=Wed, 26-Oct-2016 19:25:54 GMT
> Location: https://hdp250.local:8443/gateway/default/webhdfs/v1/tmp/xxx
> Connection: close
> Server: Jetty(9.2.15.v20160210)
> [root@hdp250 ~]# hdfs dfs -cat /tmp/xxx
> <?xml version="1.0" standalone="no"?><document>
> <empty></empty>
> <xyz>wibble</xyz>
> </document>
> {code}
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