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List: avro-user
Subject: RE: Importing Java class in Avro IDL
From: Rohini Uppuluri <rohini () glassdoor ! com>
Date: 2014-05-23 17:46:43
Message-ID: B7F3A891549FD849838B09488D51EFD44B20E374 () van-mail14-n4 ! exchange ! electric ! net
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Thanks Martin. I will check it out.
From: Martin Kleppmann [mailto:mkleppmann@linkedin.com]
Sent: Friday, May 23, 2014 1:05 AM
To: user@avro.apache.org
Subject: Re: Importing Java class in Avro IDL
There is a mechanism for using richer, language-specific types called logic=
al types, which was introduced recently: https://issues.apache.org/jira/bro=
wse/AVRO-1402 -- this might be able to do what you want. It's currently use=
d for encoding a Java BigDecimal in Avro, but it can be generalised.
However, it's very new, and not yet released. If you want to try it, you'll=
need to check out Avro from svn and build it.
Martin
On 14 May 2014, at 21:44, Rohini Uppuluri <rohini@glassdoor.com<mailto:rohi=
ni@glassdoor.com>> wrote:
Thanks Martin.
That's true. It would break cross language compability.
I am going to create an Avro schema for my java classes.
My java classes can have additions/deletion of fields. That's why, I was t=
rying to see if there was a better way to handle it.
From: Martin Kleppmann [mailto:mkleppmann@linkedin.com]
Sent: Wednesday, May 14, 2014 1:35 AM
To: user@avro.apache.org<mailto:user@avro.apache.org>
Subject: Re: Importing Java class in Avro IDL
Hi Rohini,
Avro schemas can only refer to types defined within Avro. Referring to a Ja=
va type would break Avro's cross-language compatibility. I'm afraid you'll =
need to create an Avro schema that is the equivalent of Java class B.
Martin
On 13 May 2014, at 18:27, Rohini Uppuluri <rohini@glassdoor.com<mailto:rohi=
ni@glassdoor.com>> wrote:
Hi,
I am looking to using avro serialization for our data. I see that we can im=
port avro idl within another idl file.
I was wondering if there was a way we could import java object as I have a =
use case for the same.
For example:
Class B has:
{
String element1;
A a;
}
And A is in another project.
Class A {
String elem1;
String elem2;
int id;
};
I am trying to definite avro schema for B. A is from a totally different p=
roject that does not use avro.
I could do it after code generation but I was wondering if there was any ot=
her way to do it.
Thanks,
-Rohini
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<p class="MsoNormal"><span style="color:#1F497D">Thanks Martin. I will check it out.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span \
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span \
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> \
Martin Kleppmann [mailto:mkleppmann@linkedin.com] <br>
<b>Sent:</b> Friday, May 23, 2014 1:05 AM<br>
<b>To:</b> user@avro.apache.org<br>
<b>Subject:</b> Re: Importing Java class in Avro IDL<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">There is a mechanism for using richer, language-specific types \
called logical types, which was introduced recently: <a \
href="https://issues.apache.org/jira/browse/AVRO-1402">https://issues.apache.org/jira/browse/AVRO-1402</a> -- \
this might be able to do what you want. It's currently used for encoding a Java \
BigDecimal in Avro, but it can be generalised.<o:p></o:p></p> </div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">However, it's very new, and not yet released. If you want to try \
it, you'll need to check out Avro from svn and build it.<o:p></o:p></p> </div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Martin<o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">On 14 May 2014, at 21:44, Rohini Uppuluri <<a \
href="mailto:rohini@glassdoor.com">rohini@glassdoor.com</a>> wrote:<o:p></o:p></p> \
</div> <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"><span style="color:#1F497D">Thanks Martin. \
</span><o:p></o:p></p> <p class="MsoNormal"><span style="color:#1F497D">That’s \
true. It would break cross language compability.</span><o:p></o:p></p> <p \
class="MsoNormal"><span style="color:#1F497D">I am going to create an Avro schema for \
my java classes. </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">My java classes can have \
additions/deletion of fields. That’s why, I was trying to see if there \
was a better way to handle it.</span><o:p></o:p></p> <p class="MsoNormal"><span \
style="color:#1F497D"> </span><o:p></o:p></p> <div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span \
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span \
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> \
Martin Kleppmann [<a \
href="mailto:mkleppmann@linkedin.com">mailto:mkleppmann@linkedin.com</a>] <br>
<b>Sent:</b> Wednesday, May 14, 2014 1:35 AM<br>
<b>To:</b> <a href="mailto:user@avro.apache.org">user@avro.apache.org</a><br>
<b>Subject:</b> Re: Importing Java class in Avro IDL</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<div>
<p class="MsoNormal">Hi Rohini,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Avro schemas can only refer to types defined within Avro. \
Referring to a Java type would break Avro's cross-language compatibility. I'm afraid \
you'll need to create an Avro schema that is the equivalent of Java class \
B.<o:p></o:p></p> </div>
<div>
<p class="MsoNormal"> <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Martin<o:p></o:p></p>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<div>
<div>
<p class="MsoNormal">On 13 May 2014, at 18:27, Rohini Uppuluri <<a \
href="mailto:rohini@glassdoor.com">rohini@glassdoor.com</a>> wrote:<o:p></o:p></p> \
</div> <blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Hi, <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I am looking to using avro serialization for our data. I see \
that we can import avro idl within another idl file. <o:p></o:p></p>
<p class="MsoNormal">I was wondering if there was a way we could import java object \
as I have a use case for the same.<o:p></o:p></p> <p \
class="MsoNormal"> <o:p></o:p></p> <p class="MsoNormal">For \
example:<o:p></o:p></p> <p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Class B has:<o:p></o:p></p>
<p class="MsoNormal">{<o:p></o:p></p>
<p class="MsoNormal"> String element1;<o:p></o:p></p>
<p class="MsoNormal"> A a;<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">}<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">And A is in another project.<o:p></o:p></p>
<p class="MsoNormal">Class A {<o:p></o:p></p>
<p class="MsoNormal"> String elem1;<o:p></o:p></p>
<p class="MsoNormal"> String elem2;<o:p></o:p></p>
<p class="MsoNormal"> int id;<o:p></o:p></p>
<p class="MsoNormal">};<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I am trying to definite avro schema for B. A is from a \
totally different project that does not use avro.<o:p></o:p></p> <p \
class="MsoNormal"> <o:p></o:p></p> <p class="MsoNormal">I could do it after code \
generation but I was wondering if there was any other way to do it. \
<o:p></o:p></p> <p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks, <o:p></o:p></p>
<p class="MsoNormal">-Rohini<o:p></o:p></p>
</div>
</blockquote>
</div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New \
Roman","serif""> </span><o:p></o:p></p> </div>
</blockquote>
</div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New \
Roman","serif""><o:p> </o:p></span></p> </div>
</body>
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