ASCIIbetical's questions

I configured and deployed hadoop for single node setup via this tutorial.

Everything deployed fine, but when I do jps for have a look on active processes, datanode is not shown.

I manually tried to start datanode by going to $HADOOP_HOME/bin : hadoop -datanode, but to no avail.

Basically to sum up, datanode process is not running at all for the hadoop cluster.

Also, I want to know whether a single machine can have 2 hadoop installations. I am using one for mapreduce processes and another one for search engine. ? so their directory being different, is that okay ? also, I run a single hadoop operation at a time.

EDIT 1#:- if this helps, here's the log when i tried running datanode via $HADOOP_HOME.

root@thinktank:/usr/local/hadoop/bin# hadoop datanode
Warning: $HADOOP_HOME is deprecated.

13/08/27 16:34:57 INFO datanode.DataNode: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG:   host = thinktank/127.0.1.1
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 1.2.1
STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013  
STARTUP_MSG:   java = 1.6.0_27  
************************************************************/  
13/08/27 16:34:57 INFO impl.MetricsConfig: loaded properties from hadoop-metrics2.properties  
13/08/27 16:34:57 INFO impl.MetricsSourceAdapter: MBean for source   MetricsSystem,sub=Stats registered.  
13/08/27 16:34:57 INFO impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s).  
13/08/27 16:34:57 INFO impl.MetricsSystemImpl: DataNode metrics system started  
13/08/27 16:34:57 INFO impl.MetricsSourceAdapter: MBean for source ugi registered.  
13/08/27 16:34:57 WARN impl.MetricsSystemImpl: Source name ugi already exists!  
13/08/27 16:34:57 ERROR datanode.DataNode: java.io.IOException: Incompatible namespaceIDs in /app/hadoop/tmp/dfs/data: namenode namespaceID = 1955988395; datanode namespaceID =   1705269445
    at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:232)
    at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:147)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:414)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:321)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1712)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1651)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1669)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1795)
    at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1812)

13/08/27 16:34:57 INFO datanode.DataNode: SHUTDOWN_MSG: 
/************************************************************
SHUTDOWN_MSG: Shutting down DataNode at thinktank/127.0.1.1
************************************************************/

Is there any way to add a sound event every time I empty the trash on my Ubuntu system?

Installed Springseed here (http://www.omgubuntu.co.uk/2013/07/springseed-note-taking-app-for-ubuntu) : Note taking app on Ubuntu 12.04 lts i386, just wont work. it pretty much installed correctly, downloaded the .deb from the website here (http://getspringseed.com/) and installed it via software center. The thing just won't start ? On clicking the icon post- installation, blah, NO GUI, nothing shows up et all !? Is it with me only ? Uninstalled the app, downloaded again and ran it, No success. Care to comment ? ! Thanks.

I have connected two machines via Ethernet cable, 192.168.1.2(master) & 192.168.1.3(slave). I can ssh both and even ping command also works fine. Trouble is while running Hadoop & Nutch I have to ssh to the other machine, comes a part where ssh asks for password like this:

[email protected] password: [email protected] password

Wonder whose password should I be giving? master's? or slave's? or should it be:

master's passwd: slave passwd?.

I can't SSH localhost. I have installed OpenSSH server as well on my Ubuntu 12.04 LTS (32 bit).

connected to net (ip : 192.168.1.2) installed hadoop, running hadoop for local machine.

Here's what I get :

root@kunal-Extensa-4620:/# ssh -vvv localhost
OpenSSH_5.9p1 Debian-5ubuntu1.1, OpenSSL 1.0.1 14 Mar 2012
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to localhost [127.0.0.1] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/id_rsa type -1
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: identity file /root/.ssh/id_dsa type -1
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1.1
debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1.1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1.1
debug2: fd 3 setting O_NONBLOCK
debug3: load_hostkeys: loading entries for host "localhost" from file "/root/.ssh/known_hosts"
debug3: load_hostkeys: loaded 0 keys
debug1: SSH2_MSG_KEXINIT sent
Read from socket failed: Connection reset by peer

I am on ubuntu 12.10 and installed gnome-screensaver but I can't find any way to configure them or launch gnome-screensaver-preferences. f1.

I installed and got away with xscreensaver, now want to use gnome-screensaver. Ran this in terminal : sudo apt-get install gnome-screensaver.

Now how to configure or change them ? Like is there any GUI support for the same? I tried installing gnome screensaver and locker package from here :- https://launchpad.net/ubuntu/quantal/+source/gnome-screensaver

A .deb file, but to no avail. all help be much appreciated.