Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 77C7E9948 for ; Mon, 14 May 2012 19:37:35 +0000 (UTC) Received: (qmail 16287 invoked by uid 500); 14 May 2012 19:37:33 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 16247 invoked by uid 500); 14 May 2012 19:37:33 -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 16239 invoked by uid 99); 14 May 2012 19:37:32 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 14 May 2012 19:37:32 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=HTML_MESSAGE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: local policy) Received: from [81.7.166.231] (HELO mail.adform.com) (81.7.166.231) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 14 May 2012 19:37:24 +0000 Received: from dkexc001.adform.com ([10.0.8.3]) by mail.adform.com with XWall v3.47 ; Mon, 14 May 2012 22:37:00 +0300 Received: from DKEXC002.adform.com (10.0.19.5) by DKEXC001.adform.com (10.0.8.3) with Microsoft SMTP Server (TLS) id 14.1.355.2; Mon, 14 May 2012 22:36:59 +0300 Received: from DKEXC001.adform.com ([fe80::6d0c:ccd8:b690:688a]) by DKEXC002.adform.com ([fe80::a869:727c:285c:fd3%16]) with mapi id 14.02.0283.003; Mon, 14 May 2012 22:36:58 +0300 From: Viktor Jevdokimov To: "user@cassandra.apache.org" Subject: RE: get dinamicsnith info from php Thread-Topic: get dinamicsnith info from php Thread-Index: AQHNMdmg9K22luAr+UqxRwG5oiTDX5bJVZpw///TpgCAAIC68A== Date: Mon, 14 May 2012 19:36:54 +0000 Message-ID: <2C85E14562B39345BCCAD90B8E7955C90D950E@DKEXC001.adform.com> References: <2C85E14562B39345BCCAD90B8E7955C90D9423@DKEXC001.adform.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [192.168.0.95] Content-Type: multipart/related; boundary="_005_2C85E14562B39345BCCAD90B8E7955C90D950EDKEXC001adformcom_"; type="multipart/alternative" MIME-Version: 1.0 X-XWALL-BCKS: auto --_005_2C85E14562B39345BCCAD90B8E7955C90D950EDKEXC001adformcom_ Content-Type: multipart/alternative; boundary="_000_2C85E14562B39345BCCAD90B8E7955C90D950EDKEXC001adformcom_" --_000_2C85E14562B39345BCCAD90B8E7955C90D950EDKEXC001adformcom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Let say you have 8 nodes cluster with replication factor 3. If one node is = down, for its token range you have only 2 nodes left, not 7, which can proc= ess you requests - other nodes will forward requests to the nearest (depend= s on snitch) or with lower latency (depends on dynamic snitch) of 2 remaini= ng. I have no idea about PHP and its multithreading capabilities, if it's impos= sible to run background thread to return dead endpoint to the list, instead= of checking it on HTTP request thread, you're stacked. For the lower laten= cies dynamic snitch already do a job for you, selecting a node with lower l= atencies. If you'd like Cassandra to avoid forwarding requests to appropriate node, b= ut making a direct request to a node where data is, you need smarter client= , capable to select node by key and other things to do to achieve this. Best regards / Pagarbiai Viktor Jevdokimov Senior Developer Email: Viktor.Jevdokimov@adform.com Phone: +370 5 212 3063, Fax +370 5 261 0453 J. Jasinskio 16C, LT-01112 Vilnius, Lithuania Follow us on Twitter: @adforminsider What is Adform: watch this short video [Adform News] Disclaimer: The information contained in this message and attachments is in= tended solely for the attention and use of the named addressee and may be c= onfidential. If you are not the intended recipient, you are reminded that t= he information remains the property of the sender. You must not use, disclo= se, distribute, copy, print or rely on this e-mail. If you have received th= is message in error, please contact the sender immediately and irrevocably = delete this message and any copies. From: ruslan usifov [mailto:ruslan.usifov@gmail.com] Sent: Monday, May 14, 2012 17:41 To: user@cassandra.apache.org Subject: Re: get dinamicsnith info from php Sorry for my bad english. I want to solve follow problem. For example we down one node for maintenanc= e reason, for a long time (30 min). Now we use TSocketPool for polling conn= ection to cassandra, but this poll implementation is as i think not so good= , it have a custom parameter setRetryInterval, with allow off broken node (= now we set i to 10sec), but this mean that every 10sec pool will try to con= net down node (i repeat we shutdown node for maintance reason), because it = doesn't know node dead or node, but cassandra cluster know this, and this c= onnection attempt is senselessly, also when node make compact it can be hea= vy loaded, and can't serve client reqest very good (at this moment we can g= ot little increase of avg backend responce time) 2012/5/14 Viktor Jevdokimov > I'm not sure, that selecting node upon DS is a good idea. First of all ever= y node has values about every node, including self. Self DS values are alwa= ys better than others. For example, 3 nodes RF=3D2: N1 N2 N3 N1 0.5ms 2ms 2ms N2 2ms 0.5ms 2ms N3 2ms 2ms 0.5ms We have monitored many Cassandra counters, including DS values for every no= de, and graphs shows that latencies is not about load. So the strategy should be based on use case, node count, RF, replica placem= ent strategy, read repair chance, and more, and more... What do you want to achieve? Best regards / Pagarbiai Viktor Jevdokimov Senior Developer Email: Viktor.Jevdokimov@adform.com Phone: +370 5 212 3063, Fax +370 5 261 0453 J. Jasinskio 16C, LT-01112 Vilnius, Lithuania Follow us on Twitter: @adforminsider What is Adform: watch this short video [Adform News] Disclaimer: The information contained in this message and attachments is in= tended solely for the attention and use of the named addressee and may be c= onfidential. If you are not the intended recipient, you are reminded that t= he information remains the property of the sender. You must not use, disclo= se, distribute, copy, print or rely on this e-mail. If you have received th= is message in error, please contact the sender immediately and irrevocably = delete this message and any copies. From: ruslan usifov [mailto:ruslan.usifov@gmail.com] Sent: Monday, May 14, 2012 16:58 To: user@cassandra.apache.org Subject: get dinamicsnith info from php Hello I want to route request from php client to minimaly loaded node, so i need = dinamicsnitch info and gosip, how can i get this info fro php. Perhaps need= some daemon that can communicate with cassandra gosip and translate this i= nfo to php (socket for example)??? --_000_2C85E14562B39345BCCAD90B8E7955C90D950EDKEXC001adformcom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Let say you have 8 nodes = cluster with replication factor 3. If one node is down, for its token range= you have only 2 nodes left, not 7, which can process you requests – other nodes will forward requests to the nearest (depends= on snitch) or with lower latency (depends on dynamic snitch) of 2 remainin= g.

 <= /p>

I have no idea about PHP = and its multithreading capabilities, if it’s impossible to run backgr= ound thread to return dead endpoint to the list, instead of checking it on HTTP request thread, you’re stacked. For the lower latencies d= ynamic snitch already do a job for you, selecting a node with lower latenci= es.

 <= /p>

If you’d like Cassa= ndra to avoid forwarding requests to appropriate node, but making a direct = request to a node where data is, you need smarter client, capable to select node by key and other things to do to achieve this.

 <= /p>

 <= /p>

Best regards / Pagarbiai
Viktor Jevdokimov
Senior Developer

Phone: +370 5 212 3063, Fax +370 5 261 0453
J. Jasinskio 16C, LT-01112 Vilnius, Lithuania
Follow us on Twitter: @adforminsider

Disclaimer: The information contained in this message and attachments is in= tended solely for the attention and use of the named addressee and may be c= onfidential. If you are not the intended recipient, you are reminded that t= he information remains the property of the sender. You must not use, disclose, distribute, copy, print or rely= on this e-mail. If you have received this message in error, please contact= the sender immediately and irrevocably delete this message and any copies.

From: ruslan u= sifov [mailto:ruslan.usifov@gmail.com]
Sent: Monday, May 14, 2012 17:41
To: user@cassandra.apache.org
Subject: Re: get dinamicsnith info from php

 

Sorry for my bad engl= ish.


I want to solve follow problem. For example we down one node for maintenanc= e reason, for a long time (30 min). Now we use TSocketPool for polling conn= ection to cassandra, but this poll implementation is as i think not so good= , it have a custom parameter setRetryInterval, with allow off broken node (now we set i to 10sec), but this mean that eve= ry 10sec pool will try to connet down node (i repeat we shutdown node for m= aintance reason), because it doesn't know node dead or node, but cassandra = cluster know this, and this connection attempt is senselessly, also when node make compact it can be heavy loaded= , and can't serve client reqest very good (at this moment we can got little= increase of avg backend responce time)

2012/5/14 Viktor Jevdokimov <Viktor.Jevdokimov@adform.com<= /a>>

I’m not sure, that selecting node= upon DS is a good idea. First of all every node has values about every node, including self. Self DS values are always better than others.<= /span>

 

For example, 3 nodes RF=3D2:

 

N1

N2

N3

N1

0.5ms

2ms

2ms

N2

2ms

0.5ms

2ms

N3

2ms

2ms

0.5ms

 

We have monitored many Cassandra counte= rs, including DS values for every node, and graphs shows that latencies is not about load.

 

So the strategy should be based on use = case, node count, RF, replica placement strategy, read repair chance, and more, and more…

 

What do you want to achieve?

 

 

 

Best regards / Pagarbiai

Viktor Jevdokimov

Senior Developer

 

Phone: +370 5 212 3063, Fax +370 5 261 0453<= o:p>

J. Jasinskio 16C, LT-01112 Vilnius, Lithuania

Follow us on Twitter: @adforminsider

What is Adform: watch this short video

3D"Adform


Disclaimer: The information contained in this message and attachments is in= tended solely for the attention and use of the named addressee and may be c= onfidential. If you are not the intended recipient, you are reminded that t= he information remains the property of the sender. You must not use, disclose, distribute, copy, print or rely= on this e-mail. If you have received this message in error, please contact= the sender immediately and irrevocably delete this message and any copies.

 

From: ruslan usifov [mailto:= ruslan.usifov@= gmail.com]
Sent: Monday, May 14, 2012 16:58
To: u= ser@cassandra.apache.org
Subject: get dinamicsnith info from php

 

Hello

I want to route request from php client to minimaly loaded node, so i need = dinamicsnitch info and gosip, how can i get this info fro php. Perhaps need= some daemon that can communicate with cassandra gosip and translate this i= nfo to php (socket for example)???

 

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