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Re: [rdf4j-dev] UUID and registration of the StrictEvaluationStrategy
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- From: jerven Bolleman <jerven.bolleman@sib.swiss>
- Date: Mon, 22 Nov 2021 09:14:52 +0100
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Hi Håvard, Jeen,
I think this is to support some serialization capabilities. However,
I think that in the opensource users there are no users for
serialization except for one case.
The use case for serialization that is actively used is: The
OrderIterator when writing to disk it uses the serialization protocol
of the Value instances. This could be replaced by the BINARY tuple query
result format. Or something store specific that is even faster and more
compact.
The serialization is not used in the GroupIterator where instead the
MapDB logic of a POJO serializer is used.
Regards,
Jerven
On 22/11/2021 07:51, Håvard Ottestad wrote:
Hi Jeen!
I was wondering if you could explain the need to register the evaluation
strategy?
I’ve been doing some profiling and it comes up as a point of contention
when creating a lot of queries. Two things essentially, one is the use
of UUIDs which is fairly costly due to using the platform secure random
source. The second is the need to store the eval strategy in a the cache
together with the synchronization inside the cache.
https://github.com/eclipse/rdf4j/blob/fbfb00d3233b2f407c837dbbeb9fa66776cb0f75/core/queryalgebra/evaluation/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/impl/StrictEvaluationStrategy.java#L229
<https://github.com/eclipse/rdf4j/blob/fbfb00d3233b2f407c837dbbeb9fa66776cb0f75/core/queryalgebra/evaluation/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/impl/StrictEvaluationStrategy.java#L229>
Essentially I’m wondering if we can just remove the use of both the UUID
and the registration?
Cheers,
Håvard
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--
*Jerven Tjalling Bolleman*
Principal Software Developer
*SIB | Swiss Institute of Bioinformatics*
1, rue Michel Servet - CH 1211 Geneva 4 - Switzerland
t +41 22 379 58 85
Jerven.Bolleman@sib.swiss - www.sib.swiss
