VimClojure - REPL without opening a clojure file

If you just want to get a clojure REPL within vim using the excellent VimClojure, just change vim to clojure mode like so

:set ft=clojure

and start the REPL using typing \sr

Make sure, nailgun server is running in the background

Instructions to install VimClojure

Textmate - reload bundle

osascript -e 'tell app "TextMate" to reload bundles'

http://blog.macromates.com/2008/git-bundle/

macosx tar - annoying ._* files

I noticed that tar generates files starting with ._* when creating an archive

$ tar cvzf jfa.tgz jfa

And the corresponding listing in archive

ashee-mac:shiva amitava$ tar tvf jfa.tgz 
drwxr-xr-x amitava/staff     0 2010-02-19 09:18:22 jfa/
-rw-r--r-- amitava/staff   187 2010-02-19 08:40:06 jfa/._.htaccess
-rw-r--r-- amitava/staff   616 2010-02-19 08:40:06 jfa/.htaccess
....
....

Notice how it adds "._.htaccess"

I found the solution here

Here's the command for convenience
$COPYFILE_DISABLE=true tar cvzf jfa.tgz jfa

COPYFILE_DISABLE=true (for Leopard)
COPY_EXTENDED_ATTRIBUTES_DISABLE=true (for Tiger)

Clojure version

user=> *clojure-version*
{:major 1, :minor 1, :incremental 0, :qualifier ""}

F# in macosx

I downloaded FSharp-1.9.7.8 and attempted to run it in MacOSX using mono (2.4.2.3).

mono $FS_HOME/bin/fsi.exe

This kept exiting the prompt after brief attempts to spawn a GUI. I found the solution here

Invoke fsi.exe without gui and with readline as indicated in the link above

mono fsi.exe --readline+ --gui-

log4j - "appender is not assignable to Appender"

If you are getting "appender is not assignable to Appender" error in an attempt to configure log4j, just pass a system property as below

$) java -Dlog4j.ignoreTCL ...whatever...

See here

Hadoop 0.20.1 - Null pointer exception on startup

I am trying out Hadoop on my Mac0SX (10.5.8). I unzipped the distribution and after cd'ing to ~/hadoop-0.20.1/bin, ran

ashee-mac:bin amitava$ ./start-all.sh

I get the following exception

2010-01-20 13:14:13,341 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG:   host = ashee-mac/10.17.8.21
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 0.20.1
STARTUP_MSG:   build = http://svn.apache.org/repos/asf/hadoop/common/tags/release-0.20.1-rc1 -r 810220; compiled by 'oom' on Tue Sep  1 20:55:56 UTC 2009
************************************************************/
2010-01-20 13:14:13,480 ERROR org.apache.hadoop.hdfs.server.namenode.NameNode: java.lang.NullPointerException
 at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:134)
 at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:156)
 at org.apache.hadoop.hdfs.server.namenode.NameNode.getAddress(NameNode.java:160)
 at org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:175)
 at org.apache.hadoop.hdfs.server.namenode.NameNode.(NameNode.java:279)
 at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:956)
 at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:965)

2010-01-20 13:14:13,482 INFO org.apache.hadoop.hdfs.server.namenode.NameNode: SHUTDOWN_MSG: 
/************************************************************

---

Turns out, the default does not come configured with, well "defaults". The fix is easy enough as highlighted in Quick Start (duh)

conf/core-site.xml:

<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>

conf/hdfs-site.xml:

<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>

conf/mapred-site.xml:

<configuration>
<property>
<name>mapred.job.tracker</name>
<value>localhost:9001</value>
</property>
</configuration>