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https://issues.apache.org/jira/browse/JENA-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15605313#comment-15605313
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Andy Seaborne commented on JENA-1249:
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See {{ModelCom}}: the standard default is an empty prefix mapping. If the app
does not set the default prefix mapping, no migration is involved.
> ModelCom constuction triggers prefix reading in TDB
> ---------------------------------------------------
>
> Key: JENA-1249
> URL: https://issues.apache.org/jira/browse/JENA-1249
> Project: Apache Jena
> Issue Type: Bug
> Reporter: Andy Seaborne
> Attachments: ReportPerf.java
>
>
> For TDB, the Dataset-level wrapper is {{DatasetImpl}}. The model-level
> operations {{Dataset.getDefaultModel}} and {{Dataset.getNamedModel}} use a
> {{ModelCom}} to wrap the graph.
> The {{ModelCom}} construct also calls {{ModelCom.getPrefixMapping}} which in
> turn triggers the TDB graph level prefix mapping to be created.
> Due to JENA-81, the prefix map is read to the cache when the graph starts.
> Overall result - creating the model causes the prefix mappings to be read.
> We should avoid calling {{getPrefixMapping}} inside the {{ModelCom}}
> constructor.
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