我在“Cygnus can not persist data on Cosmos global instance”这个问题中讨论了同样的连接问题。但是，阅读后我没有找到解决方案。
现在，我最近在 FILAB 中部署了两个虚拟机（两个虚拟机都包含 Orion ContextBroker 0.26.1 和 Cygnus 0.11.0）。
当我尝试通过 Cygnus 在 Cosmos 上保存数据时，我收到以下错误消息（两个 VM 中相同）：
2015-12-17 19:03:00,221 (SinkRunner-PollingRunner-DefaultSinkProcessor)
[ERROR - com.telefonica.iot.cygnus.sinks.OrionSink.process(OrionSink.java:305)]
Persistence error (The /user/rmartinezcarreras/def_serv/def_serv_path/room1_room
directory could not be created in HDFS. Server response: 503 Service unavailable)
另一方面，当我尝试从任何 VM 的命令行发出请求时，我得到下一个响应：
[root@orionlarge centos]# curl -v -X GET "http://cosmos.lab.fiware.org:14000/webhdfs/v1/user/rmartinezcarreras/?
op=liststatus&user.name=rmartinezcarreras" -H "X-Auth-Token: XXXXXXX"
* About to connect() to cosmos.lab.fiware.org port 14000 (#0)
* Trying 130.206.80.46... connected
* Connected to cosmos.lab.fiware.org (130.206.80.46) port 14000 (#0)
> GET /webhdfs/v1/user/rmartinezcarreras/?
op=liststatus&user.name=rmartinezcarreras HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7
NSS/3.16.2.3 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: cosmos.lab.fiware.org:14000
> Accept: */*
> X-Auth-Token: XXXXX
>
* Closing connection #0
* Failure when receiving data from the peer
curl: (56) Failure when receiving data from the peer
尽管如此，从外部 VM（FILAB 外部）：
[root@dsieBroker orion]# curl -v -X GET
"http://cosmos.lab.fiware.org:14000/webhdfs/v1/user/rmartinezcarreras/?
op=liststatus&user.name=rmartinezcarreras" -H "X-Auth-Token: XXXXX"
* About to connect() to cosmos.lab.fiware.org port 14000 (#0)
* Trying 130.206.80.46... connected
* Connected to cosmos.lab.fiware.org (130.206.80.46) port 14000 (#0)
> GET /webhdfs/v1/user/rmartinezcarreras/?
op=liststatus&user.name=rmartinezcarreras HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7
NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: cosmos.lab.fiware.org:14000
> Accept: */*
> X-Auth-Token: XXXXXX
>
< HTTP/1.1 200 OK
< X-Powered-By: Express
< Access-Control-Allow-Origin: *
< Access-Control-Allow-Methods: HEAD, POST, GET, OPTIONS, DELETE
< Access-Control-Allow-Headers: origin, content-type, X-Auth-Token, Tenant-
ID, Authorization
< server: Apache-Coyote/1.1
< set-cookie:
hadoop.auth="u=rmartinezcarreras&p=rmartinezcarreras&t=simple&e=XXXXXX&s=
XXXXhD 8="; Version=1; Path=/
< Content-Type: application/json; charset=utf-8
< transfer-encoding: chunked
< date: Thu, 17 Dec 2015 18:52:46 GMT
< connection: close
< Content-Length: 243
< ETag: W/"f3-NL9+bYJLweyFpoJfNgjQrg"
<
{"FileStatuses":{"FileStatus":
[{"pathSuffix":"def_serv","type":"DIRECTORY","length":0,"owner":
"rmartinezcarreras","group":"rmartinezcarreras","permission":"740",
"accessTime":0,"modificationTime":1450349251833,"blockSize":0,
"replication":0}]}}
* Closing connection #0
还可以从我的 Cosmos 帐户中获得良好的结果。
我该如何解决这个问题？这似乎是一个连接问题。你可以帮帮我吗？
先感谢您