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Date: Tue, 12 Jan 2016 11:49:54 +0100
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Subject: Broadcast variable: error in the wiki?
From: Stefano Baghino <stefano.baghino@radicalbit.io>
To: user@flink.apache.org
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Hi all, I'm starting to get familiar with Flink. With the help of a
colleague I've noticed what I think may be an error in the documentation
about broadcast variables (
https://cwiki.apache.org/confluence/display/FLINK/Variables+Closures+vs.+Broadcast+Variables
).

The documentation states that a broadcast variable "takes a Flink DataSet
and makes it available to all function instances". Then it goes on with an
example of an anonymous MapFunction invoking the getRuntimeContext method.
However, if I got it right, you need to extend a RichMapFunction in order
to have access to the runtime context. We've checked the code as well and
it looks like getRuntimeContext is only available to classes extending
AbstractRichFunction.

I'd like to edit the wiki page myself but unfortunately I don't seem to
have writing privileges. Is there a way for me to contribute to the
documentation? Thank you in advance.

-- 
BR,
Stefano Baghino

Software Engineer @ Radicalbit

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<div dir=3D"ltr"><div>Hi all, I&#39;m starting to get familiar with Flink. =
With the help of a colleague I&#39;ve noticed what I think may be an error =
in the documentation about broadcast variables (<a href=3D"https://cwiki.ap=
ache.org/confluence/display/FLINK/Variables+Closures+vs.+Broadcast+Variable=
s">https://cwiki.apache.org/confluence/display/FLINK/Variables+Closures+vs.=
+Broadcast+Variables</a>).</div><div><br></div><div>The documentation state=
s that a broadcast variable &quot;takes a Flink DataSet and makes it availa=
ble to all function instances&quot;. Then it goes on with an example of an =
anonymous MapFunction invoking the getRuntimeContext method. However, if I =
got it right, you need to extend a RichMapFunction in order to have access =
to the runtime context. We&#39;ve checked the code as well and it looks lik=
e getRuntimeContext is only available to classes extending AbstractRichFunc=
tion.</div><div><br></div><div>I&#39;d like to edit the wiki page myself bu=
t unfortunately I don&#39;t seem to have writing privileges. Is there a way=
 for me to contribute to the documentation? Thank you in advance.</div><div=
><div><br></div>-- <br><div class=3D"gmail_signature"><div dir=3D"ltr"><div=
><div>BR,<br></div>Stefano Baghino<br><br></div>Software Engineer @ Radical=
bit<br></div></div>
</div></div>

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