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From Benjamin Ross <br...@Lattice-Engines.com>
Subject Help with WebHDFS authentication: simple vs simple-dt
Date Tue, 27 Sep 2016 15:54:22 GMT
I'm in the process of setting up encryption at rest on a cluster, but I want to make sure
that everything else remains permissive - otherwise it will break existing processes that
we have in place.  I'm very close to getting this working - the last piece is that webhdfs
is not permissive:

In my local setup where I have things working, webhdfs reports the following when trying to
create a file (note t=simple):
$ curl -i -X PUT 'localhost:50070/webhdfs/v1/tmp/foo?op=CREATE&overwrite=true&user.name=yarn'
Cache-Control: no-cache
Expires: Tue, 27 Sep 2016 14:52:06 GMT
Date: Tue, 27 Sep 2016 14:52:06 GMT
Pragma: no-cache
Expires: Tue, 27 Sep 2016 14:52:06 GMT
Date: Tue, 27 Sep 2016 14:52:06 GMT
Pragma: no-cache
Content-Type: application/octet-stream
Set-Cookie: hadoop.auth="u=yarn&p=yarn&t=simple&e=1475023926231&s=0wqlgqLNm50k/mN66qZwyCb4xUs=";
Path=/; HttpOnly
Location: http://localhost:50075/webhdfs/v1/tmp/foo?op=CREATE&user.name=yarn&namenoderpcaddress=localhost:9000&createflag=&createparent=true&overwrite=true
Content-Length: 0
Server: Jetty(6.1.26.hwx)

On the cluster, however, it reports the following (note t=simple-dt)
$ curl -i -X PUT ''
HTTP/1.1 307 Temporary Redirect
Server: Apache-Coyote/1.1
Set-Cookie: hadoop.auth="u=yarn&p=yarn&t=simple-dt&e=1475023818932&s=9FteGx9VW06bh5dD1L9J+1ENWtY=";
Path=/; HttpOnly
Content-Type: application/json
Content-Length: 0
Date: Tue, 27 Sep 2016 14:50:18 GMT

Note that my local setup reports the authentication type as simple whereas the cluster reports
simple-dt.  This is the reason why I'm getting an authentication failure when trying to write
a file to the cluster.  I don't want Keberos or delegation tokens enabled.

Does anyone know what I need to change so that this becomes simple again?

Thanks in advance,

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