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Subject: Re: Custom Serializers
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From: Chesnay Schepler <chesnay@apache.org>
Message-ID: <1cc70c37-61f4-937d-14f7-fd2585b772f7@apache.org>
Date: Thu, 28 Sep 2017 13:59:37 +0200
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On 19.09.2017 11:39, nragon wrote:
> createInstance(Object[] fields) at TupleSerializerBase seems not to be part
> of TypeSerializer API.
> Will I be loosing any functionality? In what cases do you use this instead
> of createInstance()?
>
> // We use this in the Aggregate and Distinct Operators to create instances
> // of immutable Tuples (i.e. Scala Tuples)
>
> Thanks
Taken from TupleSerializerBase:

// We use this in the Aggregate and Distinct Operators to create 
instances // of immutable Tuples (i.e. Scala Tuples) public abstract T 
createInstance(Object[] fields);

On 27.09.2017 17:43, nragon wrote:
> Should I use TypeSerializerSingleton if it is independent of the object which
> it's serializing?
>
>
>
> --
> Sent from:http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/
>
Generally, use TypeSerializerSingleton. There is virtually no reason to 
not use it. Do keep this section of the TypeSerializer javadoc in mind:

* The methods in this class are assumed to be stateless, such that it is 
effectively thread safe. Stateful * implementations of the methods may 
lead to unpredictable side effects and will compromise both stability 
and * correctness of the program.


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      <div class="moz-cite-prefix">On 19.09.2017 11:39, nragon wrote:<br>
      </div>
      <blockquote type="cite"
        cite="mid:1505813976505-0.post@n4.nabble.com">
        <pre wrap="">createInstance(Object[] fields) at TupleSerializerBase seems not to be part
of TypeSerializer API.
Will I be loosing any functionality? In what cases do you use this instead
of createInstance()?

// We use this in the Aggregate and Distinct Operators to create instances
// of immutable Tuples (i.e. Scala Tuples)

Thanks</pre>
      </blockquote>
      Taken from TupleSerializerBase:<br>
      <pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Courier New';font-size:9,0pt;"><span style="color:#808080;">// We use this in the Aggregate and Distinct Operators to create instances
</span><span style="color:#808080;">// of immutable Tuples (i.e. Scala Tuples)
</span><span style="color:#cc7832;">public abstract </span><span style="color:#507874;">T </span><span style="color:#ffc66d;">createInstance</span>(Object[] fields)<span style="color:#cc7832;">;

</span></pre>
      <div class="moz-cite-prefix">On 27.09.2017 17:43, nragon wrote:<br>
      </div>
      <blockquote type="cite"
        cite="mid:1506526982731-0.post@n4.nabble.com">
        <pre wrap="">Should I use TypeSerializerSingleton if it is independent of the object which
it's serializing?


--
Sent from: <a class="moz-txt-link-freetext" href="http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/">http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/</a>

</pre>
      </blockquote>
      <p>Generally, use TypeSerializerSingleton. There is virtually no
        reason to not use it. Do keep this section of the TypeSerializer
        javadoc in mind:</p>
      <pre style="background-color:#2b2b2b;color:#a9b7c6;font-family:'Courier New';font-size:9,0pt;"><span style="color:#629755;font-style:italic;">* The methods in this class are assumed to be stateless, such that it is effectively thread safe. Stateful
</span><span style="color:#629755;font-style:italic;">* implementations of the methods may lead to unpredictable side effects and will compromise both stability and
</span><span style="color:#629755;font-style:italic;">* correctness of the program.</span></pre>
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