Return-Path: X-Original-To: archive-asf-public-internal@cust-asf2.ponee.io Delivered-To: archive-asf-public-internal@cust-asf2.ponee.io Received: from cust-asf.ponee.io (cust-asf.ponee.io [163.172.22.183]) by cust-asf2.ponee.io (Postfix) with ESMTP id 5965D200B93 for ; Sat, 1 Oct 2016 17:32:09 +0200 (CEST) Received: by cust-asf.ponee.io (Postfix) id 57B0A160AD7; Sat, 1 Oct 2016 15:32:09 +0000 (UTC) Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by cust-asf.ponee.io (Postfix) with SMTP id C8CE0160AD5 for ; Sat, 1 Oct 2016 17:32:07 +0200 (CEST) Received: (qmail 55429 invoked by uid 500); 1 Oct 2016 15:32:06 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 55419 invoked by uid 99); 1 Oct 2016 15:32:06 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd3-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Sat, 01 Oct 2016 15:32:06 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd3-us-west.apache.org (ASF Mail Server at spamd3-us-west.apache.org) with ESMTP id D186A180651 for ; Sat, 1 Oct 2016 15:32:05 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd3-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: 1.679 X-Spam-Level: * X-Spam-Status: No, score=1.679 tagged_above=-999 required=6.31 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=2, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RCVD_IN_SORBS_SPAM=0.5, SPF_PASS=-0.001] autolearn=disabled Authentication-Results: spamd3-us-west.apache.org (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com Received: from mx2-lw-us.apache.org ([10.40.0.8]) by localhost (spamd3-us-west.apache.org [10.40.0.10]) (amavisd-new, port 10024) with ESMTP id NmzRarXfOziJ for ; Sat, 1 Oct 2016 15:32:02 +0000 (UTC) Received: from mail-lf0-f48.google.com (mail-lf0-f48.google.com [209.85.215.48]) by mx2-lw-us.apache.org (ASF Mail Server at mx2-lw-us.apache.org) with ESMTPS id 89C4E5F4EC for ; Sat, 1 Oct 2016 15:32:01 +0000 (UTC) Received: by mail-lf0-f48.google.com with SMTP id o17so4052489lfg.3 for ; Sat, 01 Oct 2016 08:32:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=2DkYofqU7IKV3zK7peyhq+b1ZYPh7g9q6VNdHKOG34I=; b=c94CINxo3/EoGZdM3XzBkn0Bc7LVRXWvlIP1NMUUtGG9eGy/og9zWK5J606iXjSMes epsUxl5oIXpwF62o/M1Pu8lZnrjEH+35b7Z2ePyFCqkGlOoVzxF/vieTQr80ak+l+Sgx nq7HEe6SubAKJacGeoew0sNasJT2yAIVWpmZf0gtmCRJupIflVWv5ZfVkVxbylCO0osF q5gV2Xsdd5mM/1cEfIVHmClpC6ttzGNic1R/8iMN1hq6nciH9BvA2rYMbPJE+H8WlQgR RDofMs3hQD5q6MOxHd+WBiA6Opi0KGkzlcC9VU/nGU+41bRMMZET60E2zhsy4PtMedG7 nDdw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=2DkYofqU7IKV3zK7peyhq+b1ZYPh7g9q6VNdHKOG34I=; b=cPKhh9NaZYYWvoB+SBGQNtPid1SjJpx00t3CiCAhFvKnNLIQQNyyI2iSS6X96K27bP /DpgNqt83HNV1VLulW6eYybyGkeUue3/mFwc0waVpnd0hI7r9CgjwEjplgAsaV/vo33l /BPyJ+/QvZ0NI70AxwQzPoWsRx6iMV6xyT61P6HnbAE2aw/ZgKwBSAZTzukJYF7WN60O rY5Nd3fDoE0wqt1do2ljDdagHAfUUQ4WinPQFuklqK3UuMDH4fDZ38J4isd9bb946Cdc yAOcdxy8xSNO8ghFh9fYibMoicVpd+nfLRvQdzRYRN218H4mxKMmLg3XyfjBlOn0S70M banA== X-Gm-Message-State: AA6/9RlHJqIhneCO23AcxVwwZe7QMYzhzwtqFLB7q/c3+aZwwp8Wif4KMvrtRtWGQ1Bp1fQzrqhl5rXsmKP2Jw== X-Received: by 10.25.196.76 with SMTP id u73mr5171408lff.30.1475335919955; Sat, 01 Oct 2016 08:31:59 -0700 (PDT) MIME-Version: 1.0 Received: by 10.25.75.141 with HTTP; Sat, 1 Oct 2016 08:31:58 -0700 (PDT) In-Reply-To: References: <2045743758.13821426.1475252660560.JavaMail.zimbra@dbi-services.com> From: Edward Capriolo Date: Sat, 1 Oct 2016 11:31:58 -0400 Message-ID: Subject: Re: Cassandra data model right definition To: "user@cassandra.apache.org" Content-Type: multipart/related; boundary=001a114b8c806f0e34053dcf69ce archived-at: Sat, 01 Oct 2016 15:32:09 -0000 --001a114b8c806f0e34053dcf69ce Content-Type: multipart/alternative; boundary=001a114b8c806f0e2f053dcf69cd --001a114b8c806f0e2f053dcf69cd Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable https://github.com/apache/cassandra Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL. I generally do not know what to say about these high level "oversimplifications" like "firewalls block hackers". Are there "firewalls" or do they mean IP routers with layer 4 packet inspections and layer 3 Access Control Lists? We say (and I catch myself doing it all the time) "like relational databases" often as if all relational databases work alike. A columnar store like HP Vertica is a relational database.MySql has different storage engines does MyIsam work like InnoDB? Google docs organizes data by rows and columns as well. You can wrap any storage system into an API that makes them look like rows and columns. Microsoft LINQ can enumerate your network cars and query them https://msdn.microsoft.com/en-us/library/bb308959.aspx , that really does not make your network cards a "row store" "Theoretically a row can have 2 billion columns, but in practice it shouldn't have more than 100 million columns." In practice (In my experience) the number is much lower than 100 million, and if the data actually is deleted and readded frequently the number of live columns(rows, whatever) you can use happily is even lower I believe on twitter (I am unable to find the tweet) someone was trying to convince me Cassandra was a "columnar analytic database". ROFL I believe telling someone it "row store" "like a database", is not a good idea. They might away content with that explanation. You are setting them up to walk into an anti-pattern. Like a case where the user is attempting to write and deleting 1 row and 1 column 6 billion times a day. Then you end up explaining to them http://stackoverflow.com/questions/21755286/what-exactly-happens-when-tombs= tone-limit-is-reached and how the cassandra storage model is not "like a relational database". On Fri, Sep 30, 2016 at 9:22 PM, Edward Capriolo wrote: > I can iterate over JSON data stored in mongo and present it as a table > with rows and columns. It does not make mongo a rowstore. > > On Fri, Sep 30, 2016 at 9:16 PM, Edward Capriolo > wrote: > >> The problem with calling it a row store: >> >> https://en.wikipedia.org/wiki/Row_(database) >> >> In the context of a relational database >> , a *row*=E2=80=94als= o called >> a record or >> tuple =E2=80=94represents a single, >> implicitly structured data item in >> a table . In simple >> terms, a database table can be thought of as consisting of *rows* and >> columns or fields >> .[1] >> Each row in a >> table represents a set of related data, and every row in the table has t= he >> same structure. >> >> When you have static columns and rows with maps, and lists, it is hard t= o >> argue that every row has the same structure. Physically at the storage >> layer they do not have the same structure and logically when accessing t= he >> data they barely have the same structure, as the static column is just >> appearing inside each row it is actually not contained in. >> >> On Fri, Sep 30, 2016 at 4:47 PM, Jonathan Haddad >> wrote: >> >>> +1000 to what Benedict says. I usually call it a "partitioned row store= " >>> which usually needs some extra explanation but is more accurate than >>> "column family" or whatever other thrift era terminology people still u= se. >>> On Fri, Sep 30, 2016 at 1:53 PM DuyHai Doan >>> wrote: >>> >>>> I used to present Cassandra as a NoSQL datastore with "distributed" >>>> table. This definition is closer to CQL and has some academic backgrou= nd >>>> (distributed hash table). >>>> >>>> >>>> On Fri, Sep 30, 2016 at 7:43 PM, Benedict Elliott Smith < >>>> benedict@apache.org> wrote: >>>> >>>>> Cassandra is not a "wide column store" anymore. It has a schema. >>>>> Only thrift users no longer think they have a schema (though they do)= , and >>>>> thrift is being deprecated. >>>>> >>>>> I really wish everyone would kill the term "wide column store" with >>>>> fire. It seems to have never meant anything beyond "schema-less, >>>>> row-oriented", and a "column store" means literally the opposite of t= his. >>>>> >>>>> Not only that, but people don't even seem to realise the term "column >>>>> store" existed long before "wide column store" and the latter is ofte= n >>>>> abbreviated to the former, as here: http://www.planetcassandra.org >>>>> /what-is-nosql/ >>>>> >>>>> Since it no longer applies, let's all agree as a community to forget >>>>> this awful nomenclature ever existed. >>>>> >>>>> >>>>> >>>>> On 30 September 2016 at 18:09, Joaquin Casares < >>>>> joaquin@thelastpickle.com> wrote: >>>>> >>>>>> Hi Mehdi, >>>>>> >>>>>> I can help clarify a few things. >>>>>> >>>>>> As Carlos said, Cassandra is a Wide Column Store. Theoretically a ro= w >>>>>> can have 2 billion columns, but in practice it shouldn't have more t= han 100 >>>>>> million columns. >>>>>> >>>>>> Cassandra partitions data to certain nodes based on the partition >>>>>> key(s), but does provide the option of setting zero or more clusteri= ng >>>>>> keys. Together, the partition key(s) and clustering key(s) form the = primary >>>>>> key. >>>>>> >>>>>> When writing to Cassandra, you will need to provide the full primary >>>>>> key, however, when reading from Cassandra, you only need to provide = the >>>>>> full partition key. >>>>>> >>>>>> When you only provide the partition key for a read operation, you're >>>>>> able to return all columns that exist on that partition with low lat= ency. >>>>>> These columns are displayed as "CQL rows" to make it easier to reaso= n about. >>>>>> >>>>>> Consider the schema: >>>>>> >>>>>> CREATE TABLE foo ( >>>>>> bar uuid, >>>>>> >>>>>> boz uuid, >>>>>> >>>>>> baz timeuuid, >>>>>> data1 text, >>>>>> >>>>>> data2 text, >>>>>> >>>>>> PRIMARY KEY ((bar, boz), baz) >>>>>> >>>>>> ); >>>>>> >>>>>> >>>>>> When you write to Cassandra you will need to send bar, boz, and baz >>>>>> and optionally data*, if it's relevant for that CQL row. If you chos= e not >>>>>> to define a data* field for a particular CQL row, then nothing is st= ored >>>>>> nor allocated on disk. But I wouldn't consider that caveat to be >>>>>> "schema-less". >>>>>> >>>>>> However, all writes to the same bar/boz will end up on the same >>>>>> Cassandra replica set (a configurable number of nodes) and be stored= on the >>>>>> same place(s) on disk within the SSTable(s). And on disk, each field= that's >>>>>> not a partition key is stored as a column, including clustering keys= (this >>>>>> is optimized in Cassandra 3+, but now we're getting deep into intern= als). >>>>>> >>>>>> In this way you can get fast responses for all activity for bar/boz >>>>>> either over time, or for a specific time, with roughly the same numb= er of >>>>>> disk seeks, with varying lengths on the disk scans. >>>>>> >>>>>> Hope that helps! >>>>>> >>>>>> Joaquin Casares >>>>>> Consultant >>>>>> Austin, TX >>>>>> >>>>>> Apache Cassandra Consulting >>>>>> http://www.thelastpickle.com >>>>>> >>>>>> On Fri, Sep 30, 2016 at 11:40 AM, Carlos Alonso >>>>>> wrote: >>>>>> >>>>>>> Cassandra is a Wide Column Store http://db-engines.com/en >>>>>>> /system/Cassandra >>>>>>> >>>>>>> Carlos Alonso | Software Engineer | @calonso >>>>>>> >>>>>>> >>>>>>> On 30 September 2016 at 18:24, Mehdi Bada < >>>>>>> mehdi.bada@dbi-services.com> wrote: >>>>>>> >>>>>>>> Hi all, >>>>>>>> >>>>>>>> I have a theoritical question: >>>>>>>> - Is Apache Cassandra really a column store? >>>>>>>> Column store mean storing the data as column rather than as a rows= . >>>>>>>> >>>>>>>> In fact C* store the data as row, and data is partionned with row >>>>>>>> key. >>>>>>>> >>>>>>>> Finally, for me, Cassandra is a row oriented schema less DBMS.... >>>>>>>> Is it true for you also??? >>>>>>>> >>>>>>>> Many thanks in advance for your reply >>>>>>>> >>>>>>>> Best Regards >>>>>>>> Mehdi Bada >>>>>>>> ---- >>>>>>>> >>>>>>>> *Mehdi Bada* | Consultant >>>>>>>> Phone: +41 32 422 96 00 | Mobile: +41 79 928 75 48 | Fax: +41 32 >>>>>>>> 422 96 15 >>>>>>>> dbi services, Rue de la Jeunesse 2, CH-2800 Del=C3=A9mont >>>>>>>> mehdi.bada@dbi-services.com >>>>>>>> www.dbi-services.com >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> *=E2=87=92 dbi services is recruiting Oracle & SQL Server experts = ! =E2=80=93 Join >>>>>>>> the team >>>>>>>> * >>>>>>>> >>>>>>> >>>>>>> >>>>>> >>>>> >>>> >> > --001a114b8c806f0e2f053dcf69cd Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
https://gi= thub.com/apache/cassandra

Row store=C2=A0means t= hat like relational databases, Cassandra organizes data by rows and columns= . The Cassandra Query Language (CQL) is a close relative of SQL.
=
I generally do not know what to say about these high level "oversi= mplifications" like "firewalls block hackers". Are there &qu= ot;firewalls" or do they mean IP routers with layer 4 packet inspectio= ns and layer 3 Access Control Lists?

We say (and I catch myself doin= g it all the time) "like relational databases" often as if all re= lational databases work alike. A columnar store like HP Vertica is a relati= onal database.MySql has different storage engines does MyIsam work like Inn= oDB?

Google docs organizes data by rows and columns as well. You can= wrap any storage system into an API that makes them look like rows and col= umns. Microsoft LINQ can enumerate your network cars and query them=C2=A0https://ms= dn.microsoft.com/en-us/library/bb308959.aspx , that really does not mak= e your network cards a "row store"

"Theoretically a row can have 2 billion columns,= but in practice it shouldn't have more than 100 million columns."=
In practice (In my experience) the number is much lower than 100 millio= n, and if the data actually is deleted and readded frequently the number of= live columns(rows, whatever) you can use happily is even lower
=

I believe on twitter (I am unable to find the tweet) someone was try= ing to convince me Cassandra was a "columnar analytic database".= =C2=A0 ROFL

I believe t= elling someone it "row store" "like a database", is not= a good idea. They might away content with that=C2=A0explanation. You are s= etting them up to walk into an anti-pattern. Like a case where the user is = attempting to write and deleting 1 row and 1 column 6 billion times a day. = Then you end up explaining to them=C2=A0h= ttp://stackoverflow.com/questions/21755286/what-exactly-happens-when-tombst= one-limit-is-reached=C2=A0

and how the cassandra storage model i= s not "like a relational database".=C2=A0

On Fri, Sep 30, 2016 a= t 9:22 PM, Edward Capriolo <edlinuxguru@gmail.com> wrote= :
I can iterate over JSO= N data stored in mongo and present it as a table with rows and columns. It = does not make mongo a rowstore.=C2=A0

<= div class=3D"gmail_quote">On Fri, Sep 30, 2016 at 9:16 PM, Edward Capriolo = <edlinuxguru@gmail.com> wrote:
The problem with calling it a row store:

<= a href=3D"https://en.wikipedia.org/wiki/Row_(database)" target=3D"_blank">h= ttps://en.wikipedia.org/wiki/Row_(database)

In the context of a=C2=A0relational database= , a=C2=A0ro= w=E2=80=94also called a=C2=A0record=C2=A0or=C2=A0tuple=E2=80=94represents a single, implicitly structured=C2=A0data=C2=A0item in a=C2=A0table. In simple terms, a database table can be thought of as consisting = of=C2=A0rows=C2=A0andcolumns=C2=A0or=C2= =A0fields.[1]=C2=A0Each row in a table repre= sents a set of related data, and every row in the table has the same struct= ure.

When you have static columns and rows with maps, and lis= ts, it is hard to argue that every row has the same structure. Physically a= t the storage layer they do not have the same structure and logically when = accessing the data they barely have the same structure, as the static colum= n is just appearing inside each row it is actually not contained in.
<= div class=3D"gmail_extra">
On Fri, Sep 30, 20= 16 at 4:47 PM, Jonathan Haddad <jon@jonhaddad.com> wrote:
+1000 to what Benedict says. I usually call= it a "partitioned row store" which usually needs some extra expl= anation but is more accurate than "column family" or whatever oth= er thrift era terminology people still use.
=
On Fri, Sep 30, 2016 at 1:53 PM DuyHai Doan <doanduyhai@gmail.com>= ; wrote:
I used to= present Cassandra as a NoSQL datastore with "distributed" table.= This definition is closer to CQL and has some academic background (distrib= uted hash table).


On Fri, Sep 30, 2016 at 7:43 PM, Benedict Elliott Smit= h <benedict@apache.org> wrote:
Cassandra is not a "wide column stor= e" anymore.=C2=A0 It has a schema.=C2=A0 Only thrift users no longer t= hink they have a schema (though they do), and thrift is being deprecated.

I really wish everyone would kill the ter= m "wide column store" with fire.=C2=A0 It seems to have never mea= nt anything beyond "schema-less, row-oriented", and a "colum= n store" means literally the opposite of this.

Not only that, but people don't even seem to realise the term &qu= ot;column store" existed long before "wide column store" and= the latter is often abbreviated to the former, as here: http://www.planet= cassandra.org/what-is-nosql/=C2=A0

Since = it no longer applies, let's all agree as a community to forget this awf= ul nomenclature ever existed.



On 30 Septe= mber 2016 at 18:09, Joaquin Casares <joaquin@thelastpickle.com= > wrote:
Hi Me= hdi,

I can help clarify a few things.

As Carlos said, Cassandra is a Wide Column Store. Theoretically a ro= w can have 2 billion columns, but in practice it shouldn't have more th= an 100 million columns.

Cassandra partitions data = to certain nodes based on the partition key(s), but does provide the option= of setting zero or more clustering keys. Together, the=C2=A0partition=C2= =A0key(s) and clustering key(s) form the primary key.

<= div>When writing to Cassandra, you will need to provide the full primary ke= y, however, when reading from Cassandra, you only need to provide the full = partition key.

When you only provide the partition= key for a read operation, you're able to return all columns that exist= on that partition with low latency. These columns are displayed as "C= QL rows" to make it easier to reason about.

C= onsider the schema:

CREATE TABLE foo (
=C2=A0= bar uuid,
=C2=A0 boz uuid,
=C2=A0 baz = timeuuid,
=C2=A0 data1 text,
=C2=A0 data2 text= ,
=C2=A0 PRIMARY KEY ((bar, boz), baz)
=
= );

When you write to Cassandra you will need to = send bar, boz, and baz and optionally data*, if it's relevant for that = CQL row. If you chose not to define a data* field for a particular CQL row,= then nothing is stored nor allocated on disk. But I wouldn't consider = that caveat to be "schema-less".

However= , all writes to the same bar/boz will end up on the same Cassandra replica = set (a configurable number of nodes) and be stored on the same place(s) on = disk within the SSTable(s). And on disk, each field that's not a partit= ion key is stored as a column, including clustering keys (this is optimized= in Cassandra 3+, but now we're getting deep into internals).

In this way you can get fast responses for all activity for= bar/boz either over time, or for a specific time, with roughly the same nu= mber of disk seeks, with varying lengths on the disk scans.

<= /div>
Hope that helps!

Joaquin Casares
Consultant
Austin, TX

Apache Cassandra Consulting
http://www.th= elastpickle.com

On Fri, Sep 30, 2016 at 11:40 AM, Carlos Alo= nso <info@mrcalonso.com> wrote:
Cassandra is a Wide Column Store=C2=A0http://db-engine= s.com/en/system/Cassandra

Car= los Alonso | Software Engineer |=C2=A0@calonso=

On 30 September 2016 at 18:24, Mehdi Bada <mehdi.bada@dbi-services.com> wrote:
Hi all,

I have a theoritical question:
- Is Apache Cassandra reall= y a column store?
Column store mean storing the data as colum= n rather than as a rows.

In fact C* store the= data as row, and data is partionned with row key.

=
Finally, for me, Cassandra is a row oriented schema less DBMS.... Is i= t true for you also???

Many thanks in advance = for your reply

Best Regards
Meh= di Bada
----

Mehdi Bada |= Consultant
Ph= one: +41 32 422 96 00 | Mobile: +41 79 928 75 48 = | Fax:=C2=A0+41 32 422 96 15=
dbi services, Rue de la Jeunesse 2, CH-2800 Del=C3=A9mont
<= span style=3D"color:#808080;font-size:8pt">mehdi.bada@dbi-services.com

=E2=87=92 dbi services is recruiting Oracle & SQL Server expe= rts ! =E2=80=93 Join the team
=







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