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Andy Seaborne commented on JENA-624: ------------------------------------ The PR looks right - getting stability for long-running code is important and tricky. We can review in the light of experience - getting into 3.0.1 is the start of that. From looking at the OpenJDK implementation, {{ThreadLocal::remove}} is not normally expensive. Suggestion: this ends development for 3.0.1. We resolve this as "done" and open new JIRA as needed. > Develop a new in-memory RDF Dataset implementation > -------------------------------------------------- > > Key: JENA-624 > URL: https://issues.apache.org/jira/browse/JENA-624 > Project: Apache Jena > Issue Type: Improvement > Reporter: Andy Seaborne > Assignee: A. Soroka > Labels: java, linked_data, rdf > > The current (Jan 2014) Jena in-memory dataset uses a general purpose > container that works for any storage technology for graphs together with > in-memory graphs. > This project would develop a new implementation design specifically for RDF > datasets (triples and quads) and efficient SPARQL execution, for example, > using multi-core parallel operations and/or multi-version concurrent > datastructures to maximise true parallel operation. > This is a system project suitable for someone interested in datatbase > implementation, datastructure design and implementation, operating systems or > distributed systems. > Note that TDB can operate in-memory using a simulated disk with > copy-in/copy-out semantics for disk-level operations. It is for faithful > testing TDB infrastructure and is not designed performance, general in-memory > use or use at scale. While lesson may be learnt from that system, TDB > in-memory is not the answer here. -- This message was sent by Atlassian JIRA (v6.3.4#6332)