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From: Tamar Fraenkel <tamar@tok-media.com>
Date: Wed, 18 Apr 2012 16:36:41 +0300
Message-ID: 
 <CABZP+MSOLDVk08q4wop4BxcdtiZo1GTGffmQ8LE=4NyBxSCOWg@mail.gmail.com>
Subject: Re: Counter column family
To: user@cassandra.apache.org
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My problem was the result of Hector bug, see
http://groups.google.com/group/hector-users/browse_thread/thread/8359538ed387564e

So please ignore question,
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


On Tue, Apr 17, 2012 at 6:59 PM, Tamar Fraenkel <tamar@tok-media.com> wrote:

> Hi!
> I want to understand how incrementing of counter works.
>
>
>    - I have a 3 node ring,
>    - I use FailoverPolicy.FAIL_FAST,
>    - RF is 2,
>
> I have the following counter column family
> ColumnFamily: tk_counters
>       Key Validation Class: org.apache.cassandra.db.marshal.CompositeType(
> org.apache.cassandra.db.marshal.UTF8Type,org.apache.cassandra.db.marshal.
> UUIDType)
>       Default column value validator: org.apache.cassandra.db.marshal.
> CounterColumnType
>       Columns sorted by: org.apache.cassandra.db.marshal.UTF8Type
>       Row cache size / save period in seconds / keys to save : 0.0/0/all
>       Row Cache Provider: org.apache.cassandra.cache.
> SerializingCacheProvider
>       Key cache size / save period in seconds: 0.0/14400
>       GC grace seconds: 864000
>       Compaction min/max thresholds: 4/32
>       Read repair chance: 1.0
>       Replicate on write: true
>       Bloom Filter FP chance: default
>       Built indexes: []
>       Compaction Strategy:
> org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy
>
> My CL for this column family is Write=2, Read=1.
>
> When I increment a counter (using hector mutator), and execute returns
> without errors, what is the status of the nodes at that stage.
> Can execute return before the nodes are really updated? So that if a read
> is done immediately after the increment it will still read the previous
> values?
> 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
>
>
>
>

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<div dir=3D"ltr"><span class=3D"GingerNoCheckStart"></span>My problem was t=
he result of Hector bug, see=A0
<a href=3D"http://groups.google.com/group/hector-users/browse_thread/thread=
/8359538ed387564e" target=3D"_blank">http://groups.google.com/group/hector-=
users/browse_thread/thread/8359538ed387564e</a>=A0<div>So please ignore <sp=
an>question</span>,</div>


<div>Thanks,</div><div><br clear=3D"all"><div dir=3D"ltr"><div dir=3D"ltr">=
<b><span></span>Tamar Fraenkel=A0</b><br>Senior Software Engineer, TOK Medi=
a=A0<br><br><div dir=3D"ltr"><img src=3D"cid:ii_135b91fb888fa9ff" alt=3D"In=
line image 1"><br>


<div><br><a href=3D"mailto:tamar@tok-media.com" target=3D"_blank">tamar@tok=
-media.com</a><br>Tel:=A0=A0=A0<a value=3D"+97226409736">+972 2 6409736</a>=
=A0<br>Mob:=A0=A0<a value=3D"+972548356490">+972 54 8356490</a>=A0<br>Fax:=
=A0=A0=A0<a value=3D"+97225612956">+972 2 5612956</a>=A0</div>


</div><br></div><br></div><br>
<br><br><div class=3D"gmail_quote">On Tue, Apr 17, 2012 at 6:59 PM, Tamar F=
raenkel <span dir=3D"ltr">&lt;<a href=3D"mailto:tamar@tok-media.com" target=
=3D"_blank">tamar@tok-media.com</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">


<div dir=3D"ltr">Hi!<div>I want to understand how incrementing of counter w=
orks.</div><div><br></div><div><ul><li>I have a 3 node ring,=A0</li><li>I u=
se FailoverPolicy<span style=3D"background-color:transparent">.</span>FAIL_=
FAST,=A0</li>


<li>RF is 2,=A0</li></ul></div><div><span style=3D"white-space:nowrap">I ha=
ve </span>the following counter column family</div><div><span>ColumnFamily<=
/span>: tk_counters</div>
<div>=A0 =A0 =A0 Key Validation Class: org<span>.</span><span>apache</span>=
<span>.</span><span>cassandra</span><span>.</span><span>db</span><span>.</s=
pan>marshal<span>.</span>CompositeType<span>(</span>org<span>.</span><span>=
apache</span><span>.</span><span>cassandra</span><span>.</span><span>db</sp=
an><span>.</span>marshal<span>.</span>UTF8Type<span>,</span>org<span>.</spa=
n><span>apache</span><span>.</span><span>cassandra</span><span>.</span><spa=
n>db</span><span>.</span>marshal<span>.</span>UUIDType)</div>


<div>=A0 =A0 =A0 Default column value <span>validator</span>: org<span>.</s=
pan><span>apache</span><span>.</span><span>cassandra</span><span>.</span><s=
pan>db</span><span>.</span>marshal<span>.</span>CounterColumnType</div>
<div>=A0 =A0 =A0 Columns sorted by: org<span>.</span><span>apache</span><sp=
an>.</span><span>cassandra</span><span>.</span><span>db</span><span>.</span=
>marshal<span>.</span>UTF8Type</div>
<div>=A0 =A0 =A0 Row cache size / save period in seconds / keys to save : 0=
.0/0/all</div><div>=A0 =A0 =A0 Row Cache Provider: org<span>.</span><span>a=
pache</span><span>.</span><span>cassandra</span><span>.</span>cache<span>.<=
/span>SerializingCacheProvider</div>


<div>=A0 =A0 =A0 Key cache size / save period in seconds: 0.0/14400</div><d=
iv>=A0 =A0 =A0 GC grace seconds: 864000</div><div>=A0 =A0 =A0 Compaction mi=
n/max thresholds: 4/32</div><div>=A0 =A0 =A0 Read repair chance: 1.0</div><=
div>=A0 =A0 =A0 Replicate on <span>write</span>: true</div>


<div>=A0 =A0 =A0 Bloom Filter FP chance: default</div><div>=A0 =A0 =A0 Buil=
t indexes: []</div><div>=A0 =A0 =A0 Compaction Strategy: org.apache.cassand=
ra.db.compaction.SizeTieredCompactionStrategy</div><div><br></div><div>My C=
L for this column family is Write=3D2, Read=3D1.</div>


<div><br></div><div>When I increment a counter (using hector <span>mutator<=
/span>), and execute returns without errors, what is the status of the node=
s at that stage.=A0</div>
<div>Can execute return before the nodes are really updated? So that if a r=
ead is done immediately after the increment it will still read the previous=
 values?</div><div>Thanks,</div><div><br clear=3D"all"><div dir=3D"ltr"><di=
v dir=3D"ltr">


<b><span></span>Tamar Fraenkel=A0</b><br>Senior Software Engineer, TOK Medi=
a=A0<br><br><div dir=3D"ltr"><img src=3D"cid:ii_135b91fb888fa9ff" alt=3D"In=
line image 1"><br><div><br><a href=3D"mailto:tamar@tok-media.com" target=3D=
"_blank">tamar@tok-media.com</a><br>


Tel:=A0=A0=A0<a value=3D"+97226409736">+972 2 6409736</a>=A0<br>Mob:=A0=A0<=
a value=3D"+972548356490">+972 54 8356490</a>=A0<br>Fax:=A0=A0=A0<a value=
=3D"+97225612956">+972 2 5612956</a>=A0</div></div><br></div><br></div><br>
<span></span></div></div>
</blockquote></div><span></span><span class=3D"GingerNoCheckEnd"></span><br=
></div></div>

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