Sep 2026· Zenodo (CERN European Organization for Nuclear Research)
Abstract
Class-connectivity queries can no longer cache a zero that was really an outage. _aggregate_class_connectivity used to return [] when a Neo4j or Solr call it depends on failed, and that became {'count': 0} — stored by the Solr result cache and pinned for a month at the v3-cached edge, which is how gamma Kenyon cell downstream connectivity showed "There is no data to display" on 2026-09-04 with 3,886 rows in the backend. Backend failures in the class-connectivity family now raise ConnectivityBackendError; ha_api answers 5xx and no cache layer stores it. True zeros are unchanged. A result computed with some instances' connectivity missing is tagged partial: served, never stored in the Solr result cache, kept at the edge for 600 s (VFBQUERY_PARTIAL_EDGE_TTL). /run_query now sends X-Accel-Expires: 0 + Cache-Control: no-store on any empty result, so the nginx edge never stores an empty body. No owl_cache change needed. #111
This publication proposes a definition and a classification of agile software development approaches and analyses ten software development methods that can be characterized as being "agile" against the defined criterion.
P. Abrahamsson, O. Salo, Jussi Ronkainen et al.· arXiv.org· 727 citations· ⚡54
The study shows that agile practices improve both informal and formal communication, but indicates that, in larger development situations involving multiple external stakeholders, a mismatch of adequate communication mechanisms can sometimes even hinder the communication.
M. Pikkarainen, Jukka Haikara, O. Salo et al.· Empirical Software Engineeri...· 401 citations· ⚡48
The results indicate that software engineering work practices are chosen opportunistically, adapted and configured to provide value under the constrains imposed by the startup context.
Nicolò Paternoster, Carmine Giardino, M. Unterkalmsteiner et al.· Information and Software Tec...· 394 citations· ⚡54
The perception of the impact of agile methods is predominantly positive, and several challenge areas were discovered, but based on this study, agile methods are here to stay.
M. Laanti, O. Salo, P. Abrahamsson· Information and Software Tec...· 260 citations· ⚡20
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