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[70.113.43.135]) by smtp.gmail.com with ESMTPSA id m125sm18367989wmm.8.2016.07.10.17.50.37 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Sun, 10 Jul 2016 17:50:38 -0700 (PDT) From: Graham Sanderson Content-Type: multipart/signed; boundary="Apple-Mail=_5CAFE6E1-A8C5-4C6C-A74A-F8323159DD24"; protocol="application/pkcs7-signature"; micalg=sha1 Message-Id: Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Subject: Re: Blog post on Cassandra's inner workings and performance - feedback welcome Date: Sun, 10 Jul 2016 19:50:35 -0500 References: <7C13323A-71FB-4898-9BC7-C0AD04E2DE40@gmail.com> To: user@cassandra.apache.org In-Reply-To: X-Mailer: Apple Mail (2.3124) archived-at: Mon, 11 Jul 2016 00:50:46 -0000 --Apple-Mail=_5CAFE6E1-A8C5-4C6C-A74A-F8323159DD24 Content-Type: multipart/alternative; boundary="Apple-Mail=_3AFCD33D-32B2-449A-A07E-CFE154970139" --Apple-Mail=_3AFCD33D-32B2-449A-A07E-CFE154970139 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 2 )=E2=80=9Dwhy more memory makes things worse=E2=80=9D - I=E2=80=99d be = interested to see you argue that - it really isn=E2=80=99t true with big = boxes. (but yes off heap is good) - we run 24 gig JVMs with 8g new gen = and never see more than a second or so STW and that is rare (but we do = have lot of -XX: options) > On Jul 9, 2016, at 11:58 AM, daemeon reiydelle = wrote: >=20 > I saw this really useful post a few days ago. I found the organization = and presentation quite clear and helpful (I often struggle trying to do = high level comparisons of Hadoop and Cass). Thank you! >=20 > If there was sections I would like to see your clear thoughts appear = within, it would be around: > (1) why networks need to be clean (the impact of "dirty"/erratic = networks);=20 > (2) the impact of java (off heap, stop the world garbage collection, = why more memory makes things worse; > (3) table design decisions (read mostly, write mostly, mixed = read/write, etc.) > A really great writeup, thank you! >=20 >=20 >=20 >=20 >=20 >=20 > ....... >=20 > Daemeon C.M. Reiydelle > USA (+1) 415.501.0198 > London (+44) (0) 20 8144 9872 >=20 > On Fri, Jul 8, 2016 at 11:59 PM, Manuel Kiessling = > wrote: > Yes, the joke's on me. It was a copy&paste error, and I've since = posted the correct URL (journeymonitor.com = :4000/tutorials/2016/02/29/cassandra-inner-wor= kings-and-how-this-relates-to-performance/).=20 >=20 > Substantial feedback regarding the actual post still very much = welcome. >=20 > Regards, > Manuel >=20 > Am 09.07.2016 um 03:32 schrieb daemeon reiydelle >: >=20 >> Localhost is a special network address that never leaves the = operating system. It only goes "half way" down the IP stack. Thanks for = your efforts! >>=20 >>=20 >> ....... >>=20 >> Daemeon C.M. Reiydelle >> USA (+1) 415.501.0198 >> London (+44) (0) 20 8144 9872 = >>=20 >> On Fri, Jul 8, 2016 at 5:53 PM, Joaquin Alzola = > wrote: >> Hi Manuel >>=20 >> =20 >>=20 >> I think localhost will not work for people on the internet. >>=20 >> =20 >>=20 >> BR >>=20 >> =20 >>=20 >> Joaquin >>=20 >> =20 >>=20 >> From: kiessling.manuel@gmail.com = [mailto:kiessling.manuel@gmail.com ] = On Behalf Of Manuel Kiessling >> Sent: 07 July 2016 14:12 >> To: user@cassandra.apache.org >> Subject: Blog post on Cassandra's inner workings and performance - = feedback welcome >>=20 >> =20 >>=20 >> Hi all, >>=20 >> I'm currently in the process of understanding the inner workings of = Cassandra with regards to network and local storage mechanisms and = operations. In order to do so, I've written a blog post about it which = is now in a "first final" version. >>=20 >> Any feedback, especially corrections regarding misunderstandings on = my side, would be highly appreciated. The post really represents my very = subjective view on how Cassandra works under the hood, which makes it = prone to errors of course. >>=20 >> You can access the current version at = http://localhost:4000/tutorials/2016/02/29/cassandra-inner-workings-and-ho= w-this-relates-to-performance/ = >> =20 >>=20 >> Thanks, >>=20 >> -- >>=20 >> Manuel >>=20 >> This email is confidential and may be subject to privilege. If you = are not the intended recipient, please do not copy or disclose its = content but contact the sender immediately upon receipt. >>=20 >=20 --Apple-Mail=_3AFCD33D-32B2-449A-A07E-CFE154970139 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 2 )=E2=80=9Dwhy more memory makes things worse=E2=80=9D - = I=E2=80=99d be interested to see you argue that - it really isn=E2=80=99t = true with big boxes. (but yes off heap is good) - we run 24 gig JVMs = with 8g new gen and never see more than a second or so STW and that is = rare (but we do have lot of -XX: options)

On = Jul 9, 2016, at 11:58 AM, daemeon reiydelle <daemeonr@gmail.com> = wrote:

I saw = this really useful post a few days ago. I found the organization and = presentation quite clear and helpful (I often struggle trying to do high = level comparisons of Hadoop and Cass). Thank you!

If there was sections I would = like to see your clear thoughts appear within, it would be around:
  • (1) why networks need to be = clean (the impact of "dirty"/erratic networks);
  • (2) the impact of java (off heap, stop the world garbage = collection, why more memory makes things worse;
  • (3) = table design decisions (read mostly, write mostly, mixed read/write, = etc.)

A really great writeup, thank you!





.......

Daemeon C.M. Reiydelle
USA (+1) = 415.501.0198
London (+44) (0) 20 8144 = 9872

On Fri, Jul 8, 2016 at 11:59 = PM, Manuel Kiessling <kiessling.manuel@gmail.com> wrote:
Yes, the = joke's on me. It was a copy&paste error, and I've since posted the = correct URL (journeymonitor.com:4000/tutorials/2016/02/29/cassandra-inne= r-workings-and-how-this-relates-to-performance/). 

Substantial = feedback regarding the actual post still very much welcome.

Regards,
Manuel

Am 09.07.2016 um 03:32 = schrieb daemeon reiydelle <daemeonr@gmail.com>:
Localhost is a special network address = that never leaves the operating system. It only goes "half way" down the = IP stack. Thanks for your efforts!


.......

Daemeon C.M. Reiydelle
USA (+1) 415.501.0198
London = (+44) (0) 20 8144 = 9872

On Fri, Jul 8, 2016 at 5:53 = PM, Joaquin Alzola <Joaquin.Alzola@lebara.com> wrote:

Hi Manuel

 

I think localhost will not work for people on the = internet.

 

BR

 

Joaquin

 

From: kiessling.manuel@gmail.com [mailto:kiessling.manuel@gmail.com] On Behalf Of Manuel Kiessling
Sent: 07 July 2016 14:12
To: user@cassandra.apache.org
Subject: Blog post on Cassandra's inner workings and = performance - feedback welcome

 

Hi = all,

I'm = currently in the process of understanding the inner workings of = Cassandra with regards to network and local storage mechanisms and = operations. In order to do so, I've written a blog post about it which = is now in a "first final" version.

Any = feedback, especially corrections regarding misunderstandings on my side, = would be highly appreciated. The post really represents my very = subjective view on how Cassandra works under the hood, which makes it prone to errors of course.

You can access the current version at = http://localhost:4000/tutorials/2016/02/29/cassandra-inner-workings-and-ho= w-this-relates-to-performance/

 

Thanks,

--

 Manuel

This email is confidential and may be subject to privilege. If you are = not the intended recipient, please do not copy or disclose its content = but contact the sender immediately upon receipt.



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