Well said. Very fair. I wouldn’t mind hearing from others still. You’re a
From: Jeff Jirsa [mailto:jji...@gmail.com]
Sent: Monday, February 19, 2018 9:10 AM
Cc: Cassandra DEV
Subject: Re: Cassandra Needs to Grow Up by Version Five!
There's a lot of things below I disagree with, but it's ok. I convinced myself
not to nit-pick every point.
https://issues.apache.org/jira/browse/CASSANDRA-13971 has some of Stefan's work
with cert management
Beyond that, I encourage you to do what Michael suggested: open JIRAs for
things you care strongly about, work on them if you have time. Sometime this
year we'll schedule a NGCC (Next Generation Cassandra Conference) where we talk
about future project work and direction, I encourage you to attend if you're
able (I encourage anyone who cares about the direction of Cassandra to attend,
it's probably be either free or very low cost, just to cover a venue and some
food). If nothing else, you'll meet some of the teams who are working on the
project, and learn why they've selected the projects on which they're working.
You'll have an opportunity to pitch your vision, and maybe you can talk some
folks into helping out.
On Mon, Feb 19, 2018 at 1:01 AM, Kenneth Brotman <kenbrot...@yahoo.com.invalid>
>From: Jeff Jirsa [mailto:jji...@gmail.com]
>Sent: Sunday, February 18, 2018 10:58 PM
>Subject: Re: Cassandra Needs to Grow Up by Version Five!
>> On Feb 18, 2018, at 9:39 PM, Kenneth Brotman <kenbrot...@yahoo.com.INVALID>
> >Cassandra feels like an unfinished program to me. The problem is not that
> >it’s open source or cutting edge. It’s an open source cutting edge program
> >that lacks some of its basic functionality. We are all stuck addressing
> >fundamental mechanical tasks for Cassandra because the basic code that would
> >do that part has not been contributed yet.
>There’s probably 2-3 reasons why here:
>1) Historically the pmc has tried to keep the scope of the project very
>narrow. It’s a database. We don’t ship drivers. We don’t ship developer tools.
>We don’t ship fancy UIs. We ship a database. I think for the most part the
>narrow vision has been for the best, but maybe it’s time to reconsider some of
>Postgres will autovacuum to prevent wraparound (hopefully), but everyone I
>know running Postgres uses flexible-freeze in cron - sometimes it’s ok to let
>the database have its opinions and let third party tools fill in the gaps.
I can appreciate the desire to stay in scope. I believe usability is the King.
When users have to learn the database, then learn what they have to automate,
then learn an automation tool and then use the automation tool to do something
that is as fundamental as the fundamental tasks I described, then something is
missing from the database itself that is adversely affecting usability - and
that is very bad. Where those big companies need to calculate the ROI is in
the cost of acquiring or training the next group of users. Consider how steep
the learning curve is for new users. Consider the business case for improving
ease of use.
>2) Cassandra is, by definition, a database for large scale problems. Most of
>the companies working on/with it tend to be big companies. Big companies often
>have pre-existing automation that solved the stuff you consider fundamental
>tasks, so there’s probably nobody actively working on the solved problems that
>you may consider missing features - for many people they’re already solved.
I could be wrong but it sounds like a lot of the code work is done, and if the
companies would take the time to contribute more code, then the rest of the
code needed could be generated easily.
>3) It’s not nearly as basic as you think it is. Datastax seemingly had a
>multi-person team on opscenter, and while it was better than anything else
>around last time I used it (before it stopped supporting the OSS version), it
>left a lot to be desired. It’s probably 2-3 engineers working for a month to
>have any sort of meaningful, reliable, mostly trivial cluster-managing UI, and
>I can think of about 10 JIRAs I’d rather see that time be spent on first.
How about 6-9 engineers working 12 months a year on it then. I'm not kidding.
For a big company with revenues in the tens of billions or more, and a heavy
use of Cassandra nodes, it's easy to make a case for having a full time person
or more that involved. They aren't paying for using the open source code that
is Cassandra. Let's see what would the licensing fees be for a big company if
the costs where like Microsoft or Oracle would charge for their enterprise
level relational database? What's the contribution of one or two people in
>> Ease of use issues need to be given much more attention. For an
>> administrator, the ease of use of Cassandra is very poor.
>>Furthermore, currently Cassandra is an idiot. We have to do everything for
>>Cassandra. Contrast that with the fact that we are in the dawn of artificial
>And for everything you think is obvious, there’s a 50% chance someone else
>will have already solved differently, and your obvious new solution will be
>seen as an inconvenient assumption and complexity they won’t appreciate. Open
>source projects get to walk a fine line of trying to be useful without making
>too many assumptions, being “too” opinionated, or overstepping bounds. We may
>be too conservative, but it’s very easy to go too far in the opposite
I appreciate that but when such concerns result in inaction instead of
resolution that is no good.
>> Software exists to automate tasks for humans, not mechanize humans to
>> administer tasks for a database. I’m an engineering type. My job is to
>> apply science and technology to solve real world problems. And that’s where
>> I need an organization’s I.T. talent to focus; not in crank starting an
>> unfinished database.
>And that’s why nobody’s done it - we all have bigger problems we’re being paid
>to solve, and nobody’s felt it necessary. Because it’s not necessary, it’s
>nice, but not required.
Of course you would say that, you're Jeff Jirsa. In apprenticeship speak,
you’re a master. It's the classic challenge of trying to get a master to see
the legitimate issues of the apprentices. I do appreciate the time you give to
answer posts to the groups , like this post. So I don't want you to take
anything the wrong way. Where it's going to bit everyone is in the future
adoption rate. It has to be addressed.
>> Certificate management should be automated.
>Stefan (in particular) has done a fair amount of work on this, but I’d bet 90%
>of users don’t use ssl and genuinely don’t care.
I didn't realize. Could I trouble you for a link so I could get up to speed?
>> Cluster wide management should be a big theme in any next major release.
>Na. Stability and testing should be a big theme in the next major release.
Double Na on that one Jeff. I think you have a concern there about the need to
test sufficiently to ensure the stability of the next major release. That
makes perfect sense.- for every release, especially the major ones. Continuous
improvement is not a phase of development for example. CI should be in
everything, in every phase. Stability and testing a part of every release not
just one. A major release should be a nice step from the previous major
>> What is a major release? How many major releases could a program have
>> before all the coding for basic stuff like installation, configuration and
>> maintenance is included!
>> Finish the basic coding of Cassandra, make it easy to use for
>> administrators, make is smart, add cluster wide management. Keep Cassandra
>> competitive or it will soon be the old Model T we all remember fondly.
>Let’s keep some perspective. Most of us came to Cassandra from rdbms worlds
>where we were building solutions out of a bunch of master/slave MySQL /
>Postgres type databases. I started using Cassandra 0.6 when I needed to store
>something like 400gb/day in 200whatever on spinning disks when 100gb felt like
>a “big” database, and the thought of writing runbooks and automation to
>automatically pick the most up to date slave as the new master, promote it,
>repoint the other slave to the new master, then reformat the old master and
>add it as a new slave without downtime and without potentially deleting the
>company’s whole dataset sounded awful. Cassandra solved that problem, at the
>cost of maintaining a few yaml (then xml) files. Yes there are rough edges -
>they get slightly less rough on each new release. Can we do better? Sure, use
>your engineering time and send some patches. But the basic stuff is the nuts
>and bolts of the database: I care way more about streaming and compaction than
>I’ll ever care about installation.
I can relate. I was studying the enterprise level MS SQL Server stuff. I
noticed exactly what you described. I decided maybe I'll just do other stuff
and wait for things to develop more. I'm very excited about the way Cassandra
addresses things. Streaming and compaction - very good. I'm glad. Items
related to usability are not optional though.
>> I ask the Committee to compile a list of all such items, make a plan, and
>> commit to including the completed and tested code as part of major release
>> 5.0. I further ask that release 4.0 not be delayed and then there be an
>> unusually short skip to version 5.0.
>The committers are working their ass off on all sorts of hard problems. Some
>of those are probably even related to Cassandra. If you have idea, open a
>JIRA. If you have time, send a patch. Or review a patch. But don’t expect a
>bunch of people to set down work on optimizing the database to work on
>packaging and installation, because there’s no ROI in it for 99% of the
>existing committers: we’re working on the database to solve problems, and
>installation isn’t one of those problems.
I'm sure they are working very hard on all kinds of hard problems. I actually
wrote "Committee", not "committers" There is an obvious shortage of
contributors when you consider the size of the organizations using Cassandra.
That leave the burden on an unfair few. Installation or more generally I would
say usability is not that big a problem for the big companies out there. Good
Ask a new organization or a modest size organization that is struggling to
manage their Cassandra cluster that usability is not a big problem. It truly is
a big problem for many stakeholders of Cassandra. It needs to be given a bigger
priority. Hopefully others will weigh in.
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