Venkat$ echo

Sometimes you like to get the user's attention to a specific control like button or image etc. In Mac I have seen the icons jumping of the "Dock" to get our attention, So I thought why not try a similar behaviour inside a App. So below is the sample app where I have made a button to jump. IOS_JumpingButton_Example_Source_From_gitHub

Click here for other Tableau related Blogs In many report we might have requirements to restrict a "filter values" based on value selected on a another "filter". Usually we used to use AJAX techniques to achieve this. In tableau its quite easy to achieve the same result, by just checking few options. Here is a working sample -  ven_AJAX_Like_FilterSample Lets assume you have 3 filters continent, country  and city. Make a "quick Filter" for all three of them Optional Step: Change the filter to a multi-drop down box or just leave it as is Now from the "quick filter" options ( the down arrow on the right corner of quick filter) of the Country filter  and check "only relavant values". Do the same for City filter Now you will see that the country filter values and city filter values gets adjusted based on what value you select on other filters.

This post will link to all the other posts on Tableau. Ajax Filters .( i.e when you select one filter it should restrict the values on other filters based on the value selected.) Tableau Maps - Custom shapes / polygon - Basics. Convert Oracle Spatial Data into Tableau Format Tableau - Accessing Tableau's DB Tableau : Convert ESRI shapes into Tableau Format My CV - with Story Board

"Word Count" I know this is one of the common example you will find when searching for hadoop examples. The code for this comes along with the hadoop installation.  This is a very very simple example which you can use to understand how the hadoop code works. Steps: Make some sample files. I have made 2 files - you can download them from this link - test sample files Now load these files into Hadoop's HDFS ./hadoop-1.0.4/bin/hadoop dfs -copyFromLocal /home/venkat/Documents/*.txt /source_data/ You can also see the uploaded files using the hadoop web portal. As i said earlier hadoop installation should contain an example jar which has got "word count" as one of the example. Here is where you can find that example jar /hadoop-examples-1.0.4.jar Use this command to see the classes related to "word count" jar -tvf ./hadoop-1.0.4/hadoop-examples-1.0.4.jar | grep 'wordcount.class' -i If you would like to see the source...

Hadoop shell commands are very similar to linux shell commands. The Below links gives the complete set of commands Hadoop Shell Commands  - http://hadoop.apache.org/docs/r0.18.3/hdfs_shell.html Below are some of the important ones are ./hadoop-1.0.4/bin/hadoop dfs -ls / ./hadoop-1.0.4/bin/hadoop dfs -mkdir /source_data ./hadoop-1.0.4/bin/hadoop dfs -lsr / ./hadoop-1.0.4/bin/hadoop dfs -mkdir /tmp/tmp1 ./hadoop-1.0.4/bin/hadoop dfs -copyFromLocal /home/venkat/Documents/*.txt /source_data/ ./hadoop-1.0.4/bin/hadoop dfs -rmr /source_data/*.txt

Hadoop 1.0.4 on Ubuntu Linux 12.04 ( Single Node )- Part -3/3 Before starting the hadoop, you need to format the HDFS (i.e the hadoop filesystem) via the namenode. What this does is basically clears the directory values given in { dfs.name.dir}. This is the directory used by name-node to keep details of all the data in the data-node( i.e files), basically every detail required to track the which data sits in which data-node. Please understand that it does not store any data itself, it just stored the details of which data sits on which data-nodes. use the below command to format the name-node. ./hadoop-1.0.4/bin/hadoop namenode -format and the result looks like below. Now you can start your hadoop. ./hadoop-1.0.4/bin/start-all.sh and there result looks like this. Also check if all the required hadoop processes are running by typing jps.   If you face any problems then have a look into the logs file and investigate. and If you want to stop hadoop use teh bel...

Hadoop 1.0.4 on Ubuntu Linux 12.04 ( Single Node )- Part -2/3 Download Hadoop Download a stable hadoop version from  http://hadoop.apache.org/ I downloaded the this version - hadoop 1.0.4 and this is the link to it stable hadoop download page . Download the file (hadoop-1.0.4.tar.gz) and copy it under the home directory of hadoop_usr ( ie. /home/hadoop_usr/) Steps to Install Login to terminal as hadoop_usr and extract the contents of the gz file tar -xvf hadoop-1.0.4.tar.gz We have to edit the following configuration file $HADOOP_HOME/conf/hadoop-env.sh $HADOOP_HOME/conf/hdfs-site.xml $HADOOP_HOME/conf/core-site.xml $HADOOP_HOME/conf/mapred-site.xml $HADOOP_HOME/conf/masters $HADOOP_HOME/conf/slaves $HADOOP_HOME/conf/hadoop-env.sh set the Java home # The java implementation to use.Required. # export JAVA_HOME=/usr/lib/j2sdk1.5-sun export JAVA_HOME=/usr/lib/jvm/java-7-oracle $HADOOP_HOME/conf/hdfs-site.xml before editing this file create the f...