Wireshark is a GUI tool which enable us to click and capture network traffic. if you are IT admin guy, you may want something like tcpdump in linux. actually, bundled with the wireshark installation, there is one tool called tshark.exe
you can run tshark –D to list all the NIC interfaces,
If you want to see traffic for interface 4,using the –i command
for me , I just wondering to know which app is trying to send out some http traffic, 
once found it, love it!
SOLR support is one of the DataStax commercial offering for cassandra. which basically enable us to run a real-time solr query against the data in the cassandra. Here is one basic try of the features.
when you create the DSE cluster, you can change some node by setting the /etc/default/dse enable hadoop or Solr.
Change the SOLR_ENABLED or HADOOP_ENABLED one will add one more role to that Cassandra node.
For me, I have 8 Nodes as a whole cluster. 3 as regular cassandra, 3 as Hadoop node, 2 as SOLR, you can see fro the ops center view. or just through node tool.
Now Let’s create one KS called solrtest first through the OPscenter admin ui,
And create one column family called info using Cqlsh. and load some data.
DSE has some default mapping between the data stored in cassandra, and data needed to be indexed to SOLR.
By default, Nodes will be mapped to Shard. for my case, I have 2 Solr nodes, that means I have 2 Solr Shards. CF will be mapped to Core, so here I need to tell the system I want to index info column family. for columns in that CF, will be mapped to solr field. we can pick which columns need to be indexed throught some level of configration called schema.xml which is the same file in SOLR.
in the /usr/share/dse-demo/wikipedia , there are some sample schemas and script.
we change the schema.xml first, basically we just need two fields to be indexed, and default search field is comments, 
then we need post his xml to SOLR, here is one script called 1-add-schema.sh 
change the mapping url, shoul http://ANYSOLRNODE:8983/solr/resource/KEYSPACE.CF/solrconfig.xml
then we run the script to post the schema, and config file. (you are only need run this for one solr server, the solr server shared those configuration.)
after done, you can access.
http://ANYSOlrServer:8983/solr/KEYSPACE.CF/admin/ to see the solr admin ui,
when you run search, you can see the docs returned as expected.
if we change the query to comments:hello, then only first doc will be returned
If we insert more data, those data will be indexed on the fly. 
search solr, 2 docs returned.
At the same time, you can use the CQL to query the data using solr syntax.
So that’s it. you may wondering what happened underneath when we run this query?
basically it will query all SOLR Nodes to run a distrubuted shared query, get the items key, and pull the data from cassandra.
Besides the Rcmdr IDE, Rattle is another one IDE for me to do interactive data minding or just data discovery.
installation is easy, just install rattle library, then load the library , and click yes to install the prerequisites components.
once done, run rattle() to load the Rattle IDE.
like the Rcmdr, you can load/import data. then you can explore the data. Always remember to click Execute to make it happen.
since it’s used for modeling also, you can specify which column is primary key(ident here,) which one is the response value here it is called Target. 
then click explore tab, to do more exploring. like a summary.
click distribution, you can do some plotting.
in the correlation, you can tell which variable are correlated to others, blue means positive.
for the sample data, of course, revenue is correlated with request, impression and clicks.
has no relationship with fill_rate. 
for the interactive , you can use plot builder to do a lot plotting. rember to install JDK and rJava library.
here is one cool bubble plot,
Also you can run transform, clustering.
being using the RStudio for a while , RStudio is a great IDE for R programmers, you need remember all the function/parameters. For the c# programmers, RStudio is just like the Visual Studio which has a great support for intellisense, IDE. project workspace, Version control. Rcmdr is a great Visual GUI tools for data mining, even for just plotting/graphics. here is one basic tutorial,
Install Rcmdr, basically just click RStudio or Any R IDE, or just R command, try install package ‘Rcmdr’ 
once done, you can run library(Rcmdr) to startup the IDE, you may be prompted to install some components , just click yes to GO.
once done, you will see a new IDE, Rcmdr which has more menus.
basically, you can use the Data menu to import data from external data sources, or load data in packages, and run some data processing, like convert numbers to factors, or get a subset data
after data was loaded, you can view/edit the data, also from the script window, you can see the genrated R script,
Now, let’s run some basic plotting, select Graphics menu,->histogram, you will be asked to chose the varible to plot based on existing dataset.
Click OK, the graphics will be shown on IDE hosted the R, here will be Rstudio for me.
you can click statistics to create one Model like LInear model, or do some dimentional analysis
one you get the model, you can click models to visualize it.
Just checked My chrome conenction, there someone are expected, someone are not. I saw 3 weird connection to Visicom-8x.nationalnet.com
then I ping the get the ip of those DNS, it’s 66.115.130.139, or 138 
when you try access this page directly, you will see error. 
weird, then I captured the Network traffic , oh got, saw the http traffic,
Follow it, it’s a http HEAD request
What the hell is the sherqsjgod host here?
after disable the extensions one by one ,it’s caused by the Web developer tools, 
stupid plug-in! here is the official link,
https://chrome.google.com/webstore/detail/bfbameneiokkgbdmiekhjnmfkcnldhhm
Just disable it, the weird traffic will be gone.
