Dear all,
I successfully installed and run Hadoop on a single machine whose ip is
192.168.1.109 (In fact it is actually an Ubuntu instance running on virtual box
) . When typing jps it shows2473 DataNode2765 TaskTracker3373 Jps2361
NameNode2588 SecondaryNameNode2655 JobTracker
This should mean that the hadoop is up and running.Running commands like
./hadoop fs -ls is fine and produces the expected result.
But If I try to connect it from my windows box whose ip is 192.168.1.80 by
writingJava code's HDFS API to connect it as follows: Configuration conf = new
Configuration();FileSystem hdfs = null;Path filenamePath = new Path(FILE_NAME);
hdfs = FileSystem.get(conf); <-- the problem occurred at this line
when I run the code, the error displayed as follows:
11/12/07 20:37:24 INFO ipc.Client: Retrying connect to server:
/192.168.1.109:9000. Already tried 0 time(s).11/12/07 20:37:26 INFO ipc.Client:
Retrying connect to server: /192.168.1.109:9000. Already tried 1
time(s).11/12/07 20:37:28 INFO ipc.Client: Retrying connect to server:
/192.168.1.109:9000. Already tried 2 time(s).11/12/07 20:37:30 INFO ipc.Client:
Retrying connect to server: /192.168.1.109:9000. Already tried 3
time(s).11/12/07 20:37:32 INFO ipc.Client: Retrying connect to server:
/192.168.1.109:9000. Already tried 4 time(s).11/12/07 20:37:33 INFO ipc.Client:
Retrying connect to server: /192.168.1.109:9000. Already tried 5
time(s).11/12/07 20:37:35 INFO ipc.Client: Retrying connect to server:
/192.168.1.109:9000. Already tried 6 time(s).11/12/07 20:37:37 INFO ipc.Client:
Retrying connect to server: /192.168.1.109:9000. Already tried 7
time(s).11/12/07 20:37:39 INFO ipc.Client: Retrying connect to server:
/192.168.1.109:9000. Already tried 8 time(s).11/12/07 20:37:41
INFO ipc.Client: Retrying connect to server: /192.168.1.109:9000. Already
tried 9 time(s).java.net.ConnectException: Call to /192.168.1.109:9000 failed
on connection exception: java.net.ConnectException: Connection refused: no
further information To make sure if the socket is already opened and
waits for the incoming connections on the hadoop serer, I netstat on the ubuntu
boxthe result shows as follows:
tcp 0 0 localhost:51201 *:* LISTEN
2765/java tcp 0 0 *:50020 *:*
LISTEN 2473/java tcp 0 0 localhost:9000 *:*
LISTEN 2361/java tcp 0 0
localhost:9001 *:* LISTEN 2655/java tcp
0 0 *:mysql *:* LISTEN -
tcp 0 0 *:50090 *:*
LISTEN 2588/java tcp 0 0 *:11211 *:*
LISTEN - tcp 0 0 *:40843
*:* LISTEN 2473/java tcp 0 0
*:58699 *:* LISTEN - tcp
0 0 *:50060 *:* LISTEN
2765/java tcp 0 0 *:50030
*:* LISTEN 2655/java tcp 0
0 *:53966 *:* LISTEN 2655/java
tcp 0 0 *:www *:* LISTEN
- tcp 0 0 *:epmd *:*
LISTEN - tcp 0 0 *:55826
*:* LISTEN 2588/java tcp 0 0 *:ftp
*:* LISTEN - tcp
0 0 *:50070 *:* LISTEN 2361/java
tcp 0 0 *:52822 *:* LISTEN
2361/java tcp 0 0 *:ssh *:*
LISTEN - tcp 0 0 *:55672
*:* LISTEN - tcp 0 0
*:50010 *:*
LISTEN 2473/java tcp 0 0 *:50075
*:* LISTEN 2473/java
I noticed that if the local address column is something like localhost:9000
(starts with localhost: not *:)It will not be able to be connected from remote
host or even in it own box in some case.I tried telnet localhost 9000 it
works, I means it can connect to the port but If I use telnet 192.168.1.109
9000The errors displays like
$ telnet 192.168.1.109 9000Trying 192.168.1.109...telnet: Unable to connect to
remote host: Connection refused
I have spent almost a week figuring out the issue I am really exhausted now and
I hope someone can help me.
Note: I am not sure if namenode by default refuses remote connection. Do I need
to change some settings in order for it to allowremote connections?
Best regards,Woraphol
