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https://issues.apache.org/jira/browse/JENA-902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne resolved JENA-902.
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Resolution: Done
Fix Version/s: Jena 2.13.1
Assignee: Andy Seaborne
> Default cache sizes too large / configurability should be more exposed
> ----------------------------------------------------------------------
>
> Key: JENA-902
> URL: https://issues.apache.org/jira/browse/JENA-902
> Project: Apache Jena
> Issue Type: Improvement
> Components: TDB
> Affects Versions: TDB 1.1.0
> Reporter: Jan De Beer
> Assignee: Andy Seaborne
> Fix For: Jena 2.13.1
>
>
> In the class "com.hp.hpl.jena.tdb.sys.SystemTDB" there are two important
> cache size settings, namely "Node2NodeIdCacheSize" and
> "NodeId2NodeCacheSize". On a 64-bit platform, they default to 100000 and
> 500000 entries.
> In our setup of 5 TDB-backed graphs inside a single dataset, these default
> settings led to out-of-memory errors of the Fuseki server although setting
> the available heap memory to 3GB. It took some heap analysis to reveal that
> these two caches were the main memory consumers. Also, from the public
> documentation of Fuseki / TDB, it wasn't so obvious that their sizes can be
> configured. Only by looking into the source code, we found that one can use a
> TDB properties file to override the defaults.
> Proposed is to lower the default settings and have a more exposed
> documentation as to tuning the memory settings of TDB.
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