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From "Rupert Westenthaler (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CLEREZZA-643) Weak Performance of "application/json+rdf" serializer on big TripleCollections and Serialzer/Parser using Platform encoding instead of UTF-8
Date Thu, 13 Oct 2011 21:27:11 GMT
Weak Performance of "application/json+rdf" serializer on big TripleCollections and Serialzer/Parser
using Platform encoding instead of UTF-8
--------------------------------------------------------------------------------------------------------------------------------------------

                 Key: CLEREZZA-643
                 URL: https://issues.apache.org/jira/browse/CLEREZZA-643
             Project: Clerezza
          Issue Type: Improvement
            Reporter: Rupert Westenthaler


Both the "application/json+rdf" serializer and parser use platform specific encodings instead
of UTF-8.

In addition the serializer suffers from very poor performance on big graphs (at least when
using SimpleMGrpah)

After some digging in the Code I came to the conclusion that this is because of the use of
multiple TripleCollection.filter(..) calls fist to filter all predicates for an subject and
than all objects for each subject/predicate combination. A trying to serialize a graph with
50k triples ended in several minutes 100% CPU.

With the next comment I will provide a patch with an implementation based on a sorted array
of the triples. With this method one can serialize graphs with 100k in about 1sec. This patch
also changes encoding to UTF-8.


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