It depends on Partition/Primary key design. In order to execute all 3 queries,
Partition Key is Org id and others are Clustering keys. if there are many org's
it will be ok, but if it is one org then a single partition will hold all the
data and its not good Naidu Saladi
On Thursday, October 6, 2016 12:14 PM, Ali Akhtar <ali.rac...@gmail.com>
wrote:
Thanks, Phil.
1- In my use-case, its probably okay to partition all the org data together.
This is for a b2b enterprise SaaS application, the customers will be
organizations.
So it is probably okay to store each org's data next to each other, right?
2- I'm thinking of having the primary key be: (org_id, team_id, project_id,
issue_id).
In the above case, will there be a skinny row per issue, or a wide row per org
/ team / project?
3- Just to double check, with the above primary key, can I still query using
just the org_id, org + team id, and org + team + project id?
4- If I wanted to refer to a particular issue, it looks like I'd need to send
all 4 parameters. That may be problematic. Is there a better way of modeling
this data?
On Thu, Oct 6, 2016 at 9:30 PM, Philip Persad <philip.per...@gmail.com> wrote:
1) No. Your first 3 queries will work but not the last one (get issue by id).
In Cassandra when you query you must include every preceding portion of the
primary key.
2) 64 bytes (16 * 4), or somewhat more if storing as strings? I don't think
that's something I'd worry too much about.
3) Depends on how you build your partition key. If partition key is (org id),
then you get one partition per org (probably bad depending on your dataset).
If partition key is (org id, team id, project id) then you will have one
partition per project which is probably fine ( again, depending on your
dataset).
Cheers,
-PhilFrom: Ali Akhtar
Sent: 2016-10-06 9:04 AM
To: user@cassandra.apache.org
Subject: Partition Key - Wide rows?
Heya,
I'm designing some tables, where data needs to be stored in the following
hierarchy:
Organization -> Team -> Project -> Issues
I need to be able to retrieve issues:
- For the whole org - using org id- For a team (org id + team id)- For a
project (org id + team id + project id)- If possible, by using just the issue id
I'm considering using all 4 ids as the primary key. The first 3 will use UUIDs,
except issue id which will be an alphanumeric string, unique per project.
1) Will this setup allow using all 4 query scenarios?2) Will this make the
primary key really long, 3 UUIDs + similar length'd issue id?3) Will this store
issues as skinny rows, or wide rows? If an org has a lot of teams, which have a
lot of projects, which have a lot of issues, etc, could I have issues w/
running out of the column limit of wide rows?4) Is there a better way of
achieving this scenario?
