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Date: Tue, 19 Apr 2016 12:14:50 +0200
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Subject: Re: class java.util.UUID is not a valid POJO type
From: Till Rohrmann <trohrmann@apache.org>
To: user@flink.apache.org
Content-Type: multipart/alternative; boundary=001a114447f45fddc60530d3bf1c

--001a114447f45fddc60530d3bf1c
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Hi Leonard,

the UUID class cannot be treated as a POJO by Flink, because it is lacking
the public getters and setters for mostSigBits and leastSigBits. However,
it should be possible to treat it as a generic type. I think the difference
is that you cannot use key expressions and key indices to define join keys.
But you can use a KeySelector to define the key.

If that should not be your problem, then it would be helpful if you could
show me the problematic code which produces the error message.

Cheers,
Till
=E2=80=8B

On Mon, Apr 18, 2016 at 9:28 PM, Leonard Wolters <leonard@crobox.com> wrote=
:

> Hi,
>
> Quick question. I'm currently implementing our Machine Learning into
> Spark using the Scala interface.
> Do I understand correctly that when using scala only, you can only use
> primitive types? How can I register
> the UUID class in order to get supported for (de)serializing between the
> nodes?
>
> BTW: Would love to see the UUID class get 'native' support.
>
> Keep on going the good work guys!,
>
> Leonard
>
>

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<div dir=3D"ltr"><div class=3D"markdown-here-wrapper" style=3D""><p style=
=3D"margin:0px 0px 1.2em!important">Hi Leonard,</p>
<p style=3D"margin:0px 0px 1.2em!important">the <code style=3D"font-size:0.=
85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;p=
adding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);bor=
der-radius:3px;display:inline;background-color:rgb(248,248,248)">UUID</code=
> class cannot be treated as a POJO by Flink, because it is lacking the pub=
lic getters and setters for <code style=3D"font-size:0.85em;font-family:Con=
solas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;whi=
te-space:pre-wrap;border:1px solid rgb(234,234,234);border-radius:3px;displ=
ay:inline;background-color:rgb(248,248,248)">mostSigBits</code> and <code s=
tyle=3D"font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace=
;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid =
rgb(234,234,234);border-radius:3px;display:inline;background-color:rgb(248,=
248,248)">leastSigBits</code>. However, it should be possible to treat it a=
s a generic type. I think the difference is that you cannot use key express=
ions and key indices to define join keys. But you can use a <code style=3D"=
font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:=
0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,=
234,234);border-radius:3px;display:inline;background-color:rgb(248,248,248)=
">KeySelector</code> to define the key.</p>
<p style=3D"margin:0px 0px 1.2em!important">If that should not be your prob=
lem, then it would be helpful if you could show me the problematic code whi=
ch produces the error message.</p>
<p style=3D"margin:0px 0px 1.2em!important">Cheers,<br>Till</p>
<div title=3D"MDH:SGkgTGVvbmFyZCw8ZGl2Pjxicj48L2Rpdj48ZGl2PnRoZSBgVVVJRGAgY=
2xhc3MgY2Fubm90IGJl
IHRyZWF0ZWQgYXMgYSBQT0pPIGJ5IEZsaW5rLCBiZWNhdXNlIGl0IGlzIGxhY2tpbmcgdGhlIHB=
1
YmxpYyBnZXR0ZXJzIGFuZCBzZXR0ZXJzIGZvciBgbW9zdFNpZ0JpdHNgIGFuZCBgbGVhc3RTaWd=
C
aXRzYC4gSG93ZXZlciwgaXQgc2hvdWxkIGJlIHBvc3NpYmxlIHRvIHRyZWF0IGl0IGFzIGEgZ2V=
u
ZXJpYyB0eXBlLiBJIHRoaW5rIHRoZSBkaWZmZXJlbmNlIGlzIHRoYXQgeW91IGNhbm5vdCB1c2U=
g
a2V5IGV4cHJlc3Npb25zIGFuZCBrZXkgaW5kaWNlcyB0byBkZWZpbmUgam9pbiBrZXlzLiBCdXQ=
g
eW91IGNhbiB1c2UgYSBgS2V5U2VsZWN0b3JgIHRvIGRlZmluZSB0aGUga2V5LjwvZGl2PjxkaXY=
+
PGJyPjwvZGl2PjxkaXY+SWYgdGhhdCBzaG91bGQgbm90IGJlIHlvdXIgcHJvYmxlbSwgdGhlbiB=
p
dCB3b3VsZCBiZSBoZWxwZnVsIGlmIHlvdSBjb3VsZCBzaG93IG1lIHRoZSBwcm9ibGVtYXRpYyB=
j
b2RlIHdoaWNoIHByb2R1Y2VzIHRoZSBlcnJvciBtZXNzYWdlLjwvZGl2PjxkaXY+PGJyPjwvZGl=
2
PjxkaXY+Q2hlZXJzLDwvZGl2PjxkaXY+VGlsbDwvZGl2Pg=3D=3D" style=3D"height:0;wid=
th:0;max-height:0;max-width:0;overflow:hidden;font-size:0em;padding:0;margi=
n:0">=E2=80=8B</div></div></div><div class=3D"gmail_extra"><br><div class=
=3D"gmail_quote">On Mon, Apr 18, 2016 at 9:28 PM, Leonard Wolters <span dir=
=3D"ltr">&lt;<a href=3D"mailto:leonard@crobox.com" target=3D"_blank">leonar=
d@crobox.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br=
>
<br>
Quick question. I&#39;m currently implementing our Machine Learning into<br=
>
Spark using the Scala interface.<br>
Do I understand correctly that when using scala only, you can only use<br>
primitive types? How can I register<br>
the UUID class in order to get supported for (de)serializing between the<br=
>
nodes?<br>
<br>
BTW: Would love to see the UUID class get &#39;native&#39; support.<br>
<br>
Keep on going the good work guys!,<br>
<br>
Leonard<br>
<br>
</blockquote></div><br></div>

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