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From: Jonathan Haddad <jon@jonhaddad.com>
Date: Tue, 03 Mar 2015 22:56:53 +0000
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 <CACUnPaAmRGwWSXBFK8zMe8tXy0aFrmKioWr7dwHz4fAL0jsohA@mail.gmail.com>
Subject: Re: Documentation of batch statements
To: user@cassandra.apache.org
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This is often a confusing topic because someone came up with the term ACID,
which lists isolation as well as atomicity, and as a result most people
assume they are independent.  This is incorrect.  For something to be
atomic, it actually requires isolation.

"An operation is atomic if no intermedia states can be observed.  It seems
to jump directly from the initial state to the result state."
- Concepts, Techniques, and Models of Computer Programming By Peter
Van-Roy, Seif Haridi


On Tue, Mar 3, 2015 at 2:30 PM Tyler Hobbs <tyler@datastax.com> wrote:

>
> On Tue, Mar 3, 2015 at 2:39 PM, Jonathan Haddad <jon@jonhaddad.com> wrote:
>
>> Actually, that's not true either.  It's technically possible for a batch
>> to be partially applied in the current implementation, even with logged
>> batches.  "atomic" is used incorrectly here, imo, since more than 2 states
>> can be visible, unapplied & applied.
>
>
> That's a matter of isolation, not atomicity.  Although, with a long enough
> gap between partial and full application, the distinction becomes somewhat
> pedantic, I suppose.
>
>
> --
> Tyler Hobbs
> DataStax <http://datastax.com/>
>

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<div dir=3D"ltr">This is often a confusing topic because someone came up wi=
th the term ACID, which lists isolation as well as atomicity, and as a resu=
lt most people assume they are independent.=C2=A0 This is incorrect.=C2=A0 =
For something to be atomic, it actually requires isolation. =C2=A0<div><br>=
</div><div>&quot;An operation is atomic if no intermedia states can be obse=
rved.=C2=A0 It seems to jump directly from the initial state to the result =
state.&quot;=C2=A0</div><div>-=C2=A0Concepts, Techniques, and Models of Com=
puter Programming<span style=3D"line-height:1.5;font-size:13.1999998092651p=
x">=C2=A0By Peter Van-Roy, Seif Haridi</span></div><div><br></div><div><br>=
</div><div><br></div></div><br><div class=3D"gmail_quote">On Tue, Mar 3, 20=
15 at 2:30 PM Tyler Hobbs &lt;<a href=3D"mailto:tyler@datastax.com">tyler@d=
atastax.com</a>&gt; wrote:<br><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"lt=
r"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Tue, Mar 3,=
 2015 at 2:39 PM, Jonathan Haddad <span dir=3D"ltr">&lt;<a href=3D"mailto:j=
on@jonhaddad.com" target=3D"_blank">jon@jonhaddad.com</a>&gt;</span> wrote:=
<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-lef=
t:1px #ccc solid;padding-left:1ex">Actually, that&#39;s not true either.=C2=
=A0 It&#39;s technically possible for a batch to be partially applied in th=
e current implementation, even with logged batches. =C2=A0&quot;atomic&quot=
; is used incorrectly here, imo, since more than 2 states can be visible, u=
napplied &amp; applied.</blockquote></div><br></div></div><div dir=3D"ltr">=
<div class=3D"gmail_extra">That&#39;s a matter of isolation, not atomicity.=
=C2=A0 Although, with a long enough gap between partial and full applicatio=
n, the distinction becomes somewhat pedantic, I suppose.<br></div></div><di=
v dir=3D"ltr"><div class=3D"gmail_extra"><br clear=3D"all"><br>-- <br><div>=
<font color=3D"#888888">Tyler Hobbs<span></span><br>
<a href=3D"http://datastax.com/" target=3D"_blank">DataStax</a><br></font><=
/div>
</div></div></blockquote></div>

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