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 C733198C0 for ; Thu, 29 Mar 2012 10:12:22 +0000 (UTC) Received: (qmail 31051 invoked by uid 500); 29 Mar 2012 10:12:20 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 31026 invoked by uid 500); 29 Mar 2012 10:12:20 -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 31014 invoked by uid 99); 29 Mar 2012 10:12:20 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 29 Mar 2012 10:12:20 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of shimi.k@gmail.com designates 209.85.215.44 as permitted sender) Received: from [209.85.215.44] (HELO mail-lpp01m010-f44.google.com) (209.85.215.44) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 29 Mar 2012 10:12:12 +0000 Received: by lagj5 with SMTP id j5so2705930lag.31 for ; Thu, 29 Mar 2012 03:11:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=5UEgoSDdgOGp3MGQ5L7s82o5uRY5ql43GznbIlIVkh8=; b=LaswdS/WqVukIapgRDxGcdZ9sbJ83ieIRaZ5zP8Ugo9mIxbCKUeGtkpZRwvA2MGGHG oSt6JZQcTundJu4pbdwrdX4QMyffR/ycL84oQD6viu6s0KiOw2t9xVycmwtWAklFos1v MI7Hce8r+tQ0pYQUh6p6r+k3ZRQgCYE/QmV7D4J3glt241493Dn82YtkY+Q16GtsT8Qi 6KKs2E/Yo+dAI/hNZCBt04StBlkt6Vs7363AZAZo9wBbMVyB7+G7D5kMytr6P22Lb8DF 2oUuEAlPuB2uj4Y1pRmNATlz+Ab/3/ch0cIOTdQYiIHpwFw7NQaEIR5MazGwpCasv6EJ s2aw== MIME-Version: 1.0 Received: by 10.152.148.234 with SMTP id tv10mr27095238lab.41.1333015912241; Thu, 29 Mar 2012 03:11:52 -0700 (PDT) Received: by 10.112.9.194 with HTTP; Thu, 29 Mar 2012 03:11:51 -0700 (PDT) In-Reply-To: References: Date: Thu, 29 Mar 2012 12:11:51 +0200 Message-ID: Subject: Re: Counter question From: Shimi Kiviti To: user@cassandra.apache.org Content-Type: multipart/related; boundary=e89a8f234509edd9d504bc5ef301 --e89a8f234509edd9d504bc5ef301 Content-Type: multipart/alternative; boundary=e89a8f234509edd9d304bc5ef300 --e89a8f234509edd9d304bc5ef300 Content-Type: text/plain; charset=ISO-8859-1 You set the consistency with every request. Usually a client library will let you set a default one for all write/read requests. I don't know if Hector lets you set a default consistency level per CF. Take a look at the Hector docs or ask it in the Hector mailing list. Shimi On Thu, Mar 29, 2012 at 11:47 AM, Tamar Fraenkel wrote: > Can this be set on a CF basis. > Only this CF needs higher consistency level. > Thanks, > Tamar > > *Tamar Fraenkel * > Senior Software Engineer, TOK Media > > [image: Inline image 1] > > tamar@tok-media.com > Tel: +972 2 6409736 > Mob: +972 54 8356490 > Fax: +972 2 5612956 > > > > > > On Thu, Mar 29, 2012 at 10:44 AM, Shimi Kiviti wrote: > >> Like everything else in Cassandra, If you need full consistency you need >> to make sure that you have the right combination of (write consistency >> level) + (read consistency level) >> >> if >> W = write consistency level >> R = read consistency level >> N = replication factor >> then >> W + R > N >> >> Shimi >> >> >> On Thu, Mar 29, 2012 at 10:09 AM, Tamar Fraenkel wrote: >> >>> Hi! >>> Asking again, as I didn't get responses :) >>> >>> I have a ring with 3 nodes and replication factor of 2. >>> I have counter cf with the following definition: >>> >>> CREATE COLUMN FAMILY tk_counters >>> with comparator = 'UTF8Type' >>> and default_validation_class = 'CounterColumnType' >>> and key_validation_class = 'CompositeType(UTF8Type,UUIDType)' >>> and replicate_on_write = true; >>> >>> In my code (Java, Hector), I increment a counter and then read it. >>> Is it possible that the value read will be the value before increment? >>> If yes, how can I ensure it does not happen. All my reads and writes are >>> done with consistency level one. >>> If this is consistency issue, can I do only the actions on tk_counters >>> column family with a higher consistency level? >>> What does replicate_on_write mean? I thought this should help, but maybe >>> even if replicating after write, my read happen before replication >>> finished and it returns value from a still not updated node. >>> >>> My increment code is: >>> Mutator mutator = >>> HFactory.createMutator(keyspace, >>> CompositeSerializer.get()); >>> mutator.incrementCounter(key,"tk_counters", columnName, inc); >>> mutator.execute(); >>> >>> My read counter code is: >>> CounterQuery query = >>> createCounterColumnQuery(keyspace, >>> CompositeSerializer.get(), StringSerializer.get()); >>> query.setColumnFamily("tk_counters"); >>> query.setKey(key); >>> query.setName(columnName); >>> QueryResult> r = query.execute(); >>> return r.get().getValue(); >>> >>> Thanks, >>> *Tamar Fraenkel * >>> Senior Software Engineer, TOK Media >>> >>> [image: Inline image 1] >>> >>> tamar@tok-media.com >>> Tel: +972 2 6409736 >>> Mob: +972 54 8356490 >>> Fax: +972 2 5612956 >>> >>> >>> >>> >> > --e89a8f234509edd9d304bc5ef300 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
You set the consistency with every request.
Usually a = client library will let you set a default one for all write/read requests.<= /div>
I don't know if Hector lets you set a default consistency lev= el per CF. Take a look at the Hector docs or ask it in the Hector mailing l= ist.

Shimi=A0

On Thu, Mar = 29, 2012 at 11:47 AM, Tamar Fraenkel <tamar@tok-media.com> wrote:
Can this be set on a CF basis.
Only this CF needs high= er consistency level.
Thanks,
Tamar
Tamar Fra= enkel=A0
Senior Software Engineer, TOK Media=A0

3D"Inline

tamar@tok-media.com
Tel:= =A0=A0=A0+972 2 6409736=A0
Mob:=A0=A0+972 54 8356490=A0
Fax:=A0=A0= =A0+972 2 5612956=A0




On Thu, Mar= 29, 2012 at 10:44 AM, Shimi Kiviti <shimi.k@gmail.com> wrot= e:
Like everything else in Cassandra, If you need full consis= tency you need to make sure that you have the right combination of (write c= onsistency level) + (read consistency level)

if
W =3D=A0write consistency level
R =3D=A0read consistency level
N =3D replication factor
then
W + R > N
<= span>

Shimi


On Thu, Mar 29, 2012 at 10:09 AM, T= amar Fraenkel <tamar@tok-media.com> wrote:
Hi!<= /div>
Asking again, as I didn't get respon= ses :)

I have a ring with 3 n= odes and replication factor of 2.
I have counter cf with the following definition:

CREATE COLUMN FAMILY tk_counters
<= span style=3D"white-space:nowrap">=A0 =A0 with comparator =3D = 'UTF8Type'
=A0 =A0 and default_va= lidation_class =3D 'CounterColumnType'
=A0 =A0 and key_validation_class =3D &= #39;CompositeType(UTF8Type,UUIDType)'<= /div>
=A0 =A0 and replicate_= on_write =3D true;

=
In my code (Java, Hector), I increm= ent a counter and then read it.
Is it possible that the value read will be the value before increm= ent?
If yes, how can I ensure it does no= t happen. All my reads and writes are done with consistency level one.=A0
If this is consistency i= ssue, can I do only the actions on tk_counters column family with a higher = consistency level?
What does replicate_on_write mean? = I thought this should help, but maybe even if replicating after write= , my read happen before replication finished and it ret= urns value from a still not updated node.

My increment code is:
=A0 =A0 Mutator<Composite> mutator =3D
=A0 =A0 =A0 =A0 =A0 =A0 HFact= ory.createMutator(keysp= ace,
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 CompositeSerializer.get());
=A0 =A0 mutator.incrementCounter(ke= y,"tk_counters", columnName, inc);
=A0 =A0 mutator.execute();

My read counter code is:
=A0 =A0 CounterQuery<Composite,String> query =3D
=A0 =A0 =A0 =A0 =A0 =A0 creat= eCounterColumnQuery(keyspace,
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 CompositeSerializer.get(), Stri= ngSerializer.get());
=A0 =A0 query.setColumnFamily("tk_counters");
=A0 =A0 query.setKey(key);
=A0 =A0 query.setName(columnName);
=A0 =A0 QueryResult<= ;HCounterColumn<String>> r =3D query.execute();
=A0 =A0 return r= .get().getValue<= span>();

Thanks,
Tamar Fraenkel=A0
Senior Software Engineer= , TOK Media=A0

3D"Inline

tamar@tok-media.com
Tel:=A0=A0=A0+972 2 6= 409736=A0
Mob:=A0=A0+972 54 8356490=A0
Fax:=A0=A0= =A0+972 2 5612956=A0





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