Re: Feedback wanted for Knowledge base for all things cassandra (cassandra.link)

[Chandrasekhar Thumuluru]

Wow, this is great! Thanks!

On Mon, Feb 25, 2019 at 7:05 AM Rahul Singh 
wrote:

> Folks,
>
> I've been scrounging time to work on a knowledge resource for all things
> Cassandra ( Cassandra, DSE, Scylla, YugaByte, Elassandra)
>
> I feel like the Cassandra core community still has the most knowledge even
> though people are fragmenting into their brands.
>
> Would love to get your feedback on what you guys would want as a go to
> resource for Cassandra development, administration, architecture, etc.
> resources.
>
> *MVP  1*
> https://anant.github.io/awesome-cassandra
>
>
> *MVP  2*
> https://cassandra.netlify.com/
>
> *MVP  3*
>
> https://leaves-search.netlify.com/documents.html#/q=*:*=tags:(cassandra)=*=20&=
>   -
>
> Each of these were iterated with feedback from the community, so would
> love to get your feedback to make it better.
>
> Up next is to add the RSS feeds from the major Cassandra folks like on
> https://cassandra.alteroot.org
>
> Thanks for your feedback in advance.
>
>

RE: Determine disc space that will be freed after expansion cleanup

[Kenneth Brotman]

A real quick way to get an idea might be to run nodetool status and look at the 
imbalance of the data on each node assuming all the nodes have the same specs.

 

From: Cameron Gandevia [mailto:cameron.gande...@globalrelay.net] 
Sent: Monday, February 25, 2019 3:00 PM
To: user@cassandra.apache.org
Subject: Determine disc space that will be freed after expansion cleanup

 

Hi

Some Cassandra nodes could have rows that are associated with tokens that 
aren't owned by those nodes anymore as a result of expansion, this data will 
remain until a cleanup compaction is run.

We would like to know the best way to calculate the amount (or close to) of 
data that is essentially dead data on each node to determine how much disk 
space will be freed once the expansion is complete. One possible approach we 
considered is to identify the rows no longer owned by each node and their size 
by scanning the sstables.

 

 

Determine disc space that will be freed after expansion cleanup

[Cameron Gandevia]

Hi

Some Cassandra nodes could have rows that are associated with tokens 
that aren't owned by those nodes anymore as a result of expansion, this 
data will remain until a cleanup compaction is run.


We would like to know the best way to calculate the amount (or close to) 
of data that is essentially dead data on each node to determine how much 
disk space will be freed once the expansion is complete. One possible 
approach we considered is to identify the rows no longer owned by each 
node and their size by scanning the sstables.

Re: Feedback wanted for Knowledge base for all things cassandra (cassandra.link)

[Rahul Singh]

Kenneth,

Thanks for the support! I totally agree and that's exactly how I think of
it.. as a Body of Knowledge. Each of those iterations are to show how
people have asked for the knowledge to be presented so far.

Awesome is a proven format for many people for specific lists of useful
links for a subject. The second iteration was more for folks that want all
the "best videos" or "slides" etc .. and the third is to be able to filter
it. There's another use case of specifically human/curating / ordering of
existing links to a specific TOC subject or role as you describe it, or to
a Cassandra doc command for example. Your structure makes a lot of sense.
For the time being, the backend structure I'm using only has tags for
taxonomy.. In addition to attributes like you mentioned, I am also
considering a richer "book" or "tree" like organization via an internal
directed graph to provide the type of structure books series of articles
provide.

Google's value is in the discovery of the knowledge, but they don't
necessarily have the human level Intel to rank it based on what a beginner
,  intermediate, or advanced person may see as the same knowledge. That
level of knowledge ranking , which I do work on is a specialization of
personalization but requires tons of feedback (the kind that google gets
with searches+clicks + more). For the time being, the goal is simple: How
to get people from zero to hero .. or 0.5 to hero in the shortest amount
possible, and also still be relevant for heroes to come back and keep tabs
on what's happening.

What I don't want is for it to be a "news" hub primarily because that's
already done with the alteroot.org site and unless they take it down, I'll
probably just take their feed and integrate it and add others as I find
them.

I wish I had more time to contribute!

Best,


On Mon, Feb 25, 2019 at 11:17 AM Kenneth Brotman
 wrote:

> Hi Rahul!
>
>
>
> A truly outstanding effort for the community.  I think it should be tied
> to a complete what’s known as a “Body of Knowledge” which is the best way
> to organize it as a learning resource.  Otherwise, you are just trying to
> out google Google.  Lots of luck.  They will always have superior search
> and A.I.  You’d be just looking up subject matter sources on Google to try
> to keep your data current and complete.
>
>
>
> But, if you seek to describe the competencies of various roles related to
> Cassandra – role based is best structure and describing competencies is the
> next step flowing from the body of knowledge - then you have a specialized
> resource for all learners of Cassandra at all levels of competence and for
> all roles related to Cassandra.
>
>
>
> Regarding the resource directories, for several reasons all resource
> directories should show:
>
>   Type of medium: i.e. video, book, article, course, etc.
>
>   Date of production
>
>   Author/Presenter
>
>   Publisher/Producer/Event
>
>
>
> Thank you for the continuing effort you have made on this project Rahul!
>
>
>
> Kenneth Brotman
>
>
>
> *From:* Rahul Singh [mailto:rahul.xavier.si...@gmail.com]
> *Sent:* Monday, February 25, 2019 7:05 AM
> *To:* user
> *Subject:* Feedback wanted for Knowledge base for all things cassandra
> (cassandra.link)
>
>
>
> Folks,
>
>
> I've been scrounging time to work on a knowledge resource for all things
> Cassandra ( Cassandra, DSE, Scylla, YugaByte, Elassandra)
>
> I feel like the Cassandra core community still has the most knowledge even
> though people are fragmenting into their brands.
>
>
>
> Would love to get your feedback on what you guys would want as a go to
> resource for Cassandra development, administration, architecture, etc.
> resources.
>
>
> *MVP  1*
>
> https://anant.github.io/awesome-cassandra
>
> *MVP  2*
>
> https://cassandra.netlify.com/
>
> *MVP  3*
>
>
> https://leaves-search.netlify.com/documents.html#/q=*:*=tags:(cassandra)=*=20&=
>   -
>
>
>
> Each of these were iterated with feedback from the community, so would
> love to get your feedback to make it better.
>
>
>
> Up next is to add the RSS feeds from the major Cassandra folks like on
> https://cassandra.alteroot.org
>
>
>
> Thanks for your feedback in advance.
>
>
>

RE: Feedback wanted for Knowledge base for all things cassandra (cassandra.link)

[Kenneth Brotman]

Hi Rahul!

 

A truly outstanding effort for the community.  I think it should be tied to a 
complete what’s known as a “Body of Knowledge” which is the best way to 
organize it as a learning resource.  Otherwise, you are just trying to out 
google Google.  Lots of luck.  They will always have superior search and A.I.  
You’d be just looking up subject matter sources on Google to try to keep your 
data current and complete.

 

But, if you seek to describe the competencies of various roles related to 
Cassandra – role based is best structure and describing competencies is the 
next step flowing from the body of knowledge - then you have a specialized 
resource for all learners of Cassandra at all levels of competence and for all 
roles related to Cassandra.

 

Regarding the resource directories, for several reasons all resource 
directories should show:

  Type of medium: i.e. video, book, article, course, etc.

  Date of production

  Author/Presenter

  Publisher/Producer/Event

  

Thank you for the continuing effort you have made on this project Rahul!

 

Kenneth Brotman

 

From: Rahul Singh [mailto:rahul.xavier.si...@gmail.com] 
Sent: Monday, February 25, 2019 7:05 AM
To: user
Subject: Feedback wanted for Knowledge base for all things cassandra 
(cassandra.link)

 

Folks, 


I've been scrounging time to work on a knowledge resource for all things 
Cassandra ( Cassandra, DSE, Scylla, YugaByte, Elassandra)

I feel like the Cassandra core community still has the most knowledge even 
though people are fragmenting into their brands. 

 

Would love to get your feedback on what you guys would want as a go to resource 
for Cassandra development, administration, architecture, etc. resources. 


MVP  1

https://anant.github.io/awesome-cassandra 

MVP  2

https://cassandra.netlify.com/ 

MVP  3

https://leaves-search.netlify.com/documents.html#/q=*:* 

 =tags:(cassandra)=*=20&=  - 

 

Each of these were iterated with feedback from the community, so would love to 
get your feedback to make it better. 

 

Up next is to add the RSS feeds from the major Cassandra folks like on 
https://cassandra.alteroot.org 

 

Thanks for your feedback in advance. 


  

 

Re: Cassandra config in table

[Abdul Patel]

Thanks!

On Monday, February 25, 2019, Jeff Jirsa  wrote:

> Not in any released version, but something similar to that is coming in 4.0
>
> --
> Jeff Jirsa
>
>
> > On Feb 25, 2019, at 7:22 AM, Abdul Patel  wrote:
> >
> > Do we have any sustem table which stores all config details which we
> have in yaml or cassandra env.sh?
>
> -
> To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org
> For additional commands, e-mail: user-h...@cassandra.apache.org
>
>

Re: Cassandra config in table

[Jeff Jirsa]

Not in any released version, but something similar to that is coming in 4.0

-- 
Jeff Jirsa


> On Feb 25, 2019, at 7:22 AM, Abdul Patel  wrote:
> 
> Do we have any sustem table which stores all config details which we have in 
> yaml or cassandra env.sh?

-
To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org
For additional commands, e-mail: user-h...@cassandra.apache.org

Re: Cassandra config in table

[Chris Lohfink]

In 4.0+ you can SELECT * FROM system_views.settings;

Chris

On Mon, Feb 25, 2019 at 9:22 AM Abdul Patel  wrote:

> Do we have any sustem table which stores all config details which we have
> in yaml or cassandra env.sh?

RE: Cassandra config in table

[Kenneth Brotman]

Hi Abdul,

 

system.local I believe has the info you would want.  Here is a link about 
querying the system keyspace: 
https://docs.datastax.com/en/cql/3.3/cql/cql_using/useQuerySystem.html

 

Kenneth Brotman 

 

From: Abdul Patel [mailto:abd786...@gmail.com] 
Sent: Monday, February 25, 2019 7:23 AM
To: User@cassandra.apache.org
Subject: Cassandra config in table

 

Do we have any sustem table which stores all config details which we have in 
yaml or cassandra env.sh? 

Cassandra config in table

[Abdul Patel]

Do we have any sustem table which stores all config details which we have
in yaml or cassandra env.sh?

Feedback wanted for Knowledge base for all things cassandra (cassandra.link)

[Rahul Singh]

Folks,

I've been scrounging time to work on a knowledge resource for all things
Cassandra ( Cassandra, DSE, Scylla, YugaByte, Elassandra)

I feel like the Cassandra core community still has the most knowledge even
though people are fragmenting into their brands.

Would love to get your feedback on what you guys would want as a go to
resource for Cassandra development, administration, architecture, etc.
resources.

*MVP  1*
https://anant.github.io/awesome-cassandra


*MVP  2*
https://cassandra.netlify.com/

*MVP  3*
https://leaves-search.netlify.com/documents.html#/q=*:*=tags:(cassandra)=*=20&=
  -

Each of these were iterated with feedback from the community, so would love
to get your feedback to make it better.

Up next is to add the RSS feeds from the major Cassandra folks like on
https://cassandra.alteroot.org

Thanks for your feedback in advance.