Remote connection to fiware-cosmos returning authentication error

Question

We have a COSMOS account on cosmos.lab.fi-ware.org and can load files locally onto the cluster.

However, we are having trouble loading remotely, the instructions we followed on the guide site show the following:

However, using the WebHDFS/HttpFS RESTful API will allow you to upload files existing outside the global instance of Cosmos in FI-LAB. The following example uses HttpFS instead of WebHDFS (uses the TCP/14000 port instead of TCP/50070), and curl is used as HTTP client (but your applications should implement your own HTTP client):

[remote-vm]$ curl -i -X PUT "http://cosmos.lab.fi-ware.org:14000/webhdfs/v1/user/$COSMOS_USER/input_data?op=MKDIRS&user.name=$COSMOS_USER"
[remote-vm]$ curl -i -X PUT ..etc
[remote-vm]$ curl -i -X PUT -T etc..

As you can see, the data uploading is a two-step operation, as stated in the WebHDFS specification: the first invocation of the API talks directly with the Head Node, specifying the new file creation and its name; then the Head Node sends a temporary redirection response, specifying the Data Node among all the existing ones in the cluster where the data has to be stored, which is the endpoint of the second step. Nevertheless, the HttpFS gateway implements the same API but its internal behaviour changes, making the redirection to point to the Head Node itself.

However, when we run these commands we get server errors coming back, one example is:

~ kari$ -bash: user.name=kdempsey: command not found
HTTP/1.1 100 Continue

HTTP/1.1 401 Unauthorized
Server: Apache-Coyote/1.1
Set-Cookie: hadoop.auth=""; Expires=Thu, 01-Jan-1970 00:00:10 GMT; Path=/
Content-Type: text/html;charset=utf-8
Content-Length: 1275
Date: Fri, 05 Jun 2015 12:58:20 GMT

Apache Tomcat/6.0.32 - Error report<!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}-->

HTTP Status 401 - org.apache.hadoop.security.authentication.client.AuthenticationException: Anonymous requests are disallowed

type Status report

message org.apache.hadoop.security.authentication.client.AuthenticationException: Anonymous requests are disallowed

description This request requires HTTP authentication (org.apache.hadoop.security.authentication.client.AuthenticationException: Anonymous requests are disallowed).

Apache Tomcat/6.0.32

Another was a 500 server error. Could please provide the commands for remotely loading a file into the COSMOS shared resource.

Ultimately we want to take data from our InfluxDB and load into COSMOS, we would like to do it via REST call if possible (otherwise python).

Many thanks, Kari

Answer 1

As the roor user, I've tested your account and it works perfectly:

$ curl -i -X PUT "http://cosmos.lab.fi-ware.org:14000/webhdfs/v1/user/kdempsey/frbtest_deleteme?op=MKDIRS&user.name=kdempsey"
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Set-Cookie: hadoop.auth="u=kdempsey&p=kdempsey&t=simple&e=1434045807412&s=iFdK86PWTbJykXymYLS9qZcIE2g="; Version=1; Path=/
Content-Type: application/json
Transfer-Encoding: chunked
Date: Thu, 11 Jun 2015 08:03:27 GMT

{"boolean":true}
$ curl -i -X GET "http://cosmos.lab.fi-ware.org:14000/webhdfs/v1/user/kdempsey/?op=LISTSTATUS&user.name=kdempsey"
HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Set-Cookie: hadoop.auth="u=kdempsey&p=kdempsey&t=simple&e=1434045881826&s=GkLYQ/BqnBNPFBNL3ZPwkxcwbx8="; Version=1; Path=/
Content-Type: application/json
Transfer-Encoding: chunked
Date: Thu, 11 Jun 2015 08:04:41 GMT

{"FileStatuses":{"FileStatus":[{"pathSuffix":"frbtest_deleteme","type":"DIRECTORY","length":0,"owner":"kdempsey","group":"kdempsey","permission":"755","accessTime":0,"modificationTime":1434009807428,"blockSize":0,"replication":0},{"pathSuffix":"input","type":"DIRECTORY","length":0,"owner":"kdempsey","group":"kdempsey","permission":"755","accessTime":0,"modificationTime":1433508554303,"blockSize":0,"replication":0},{"pathSuffix":"input_data","type":"DIRECTORY","length":0,"owner":"kdempsey","group":"kdempsey","permission":"755","accessTime":0,"modificationTime":1433508958231,"blockSize":0,"replication":0}]}}

As you can see, I've created a frbtest_deleteme folder, and then I've listed your HDFS userspace (/user/kdempsey) in order to get the list of subdirectories; among them, you'll find frbtest_deleteme.