ASF GitHub Bot commented on JENA-1223:

Github user afs commented on the issue:

    This first part of the PR is for JENA-1237.

> Provide transaction promotion
> -----------------------------
>                 Key: JENA-1223
>                 URL: https://issues.apache.org/jira/browse/JENA-1223
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: TDB
>    Affects Versions: Jena 3.1.0
>            Reporter: Andy Seaborne
> This JIRA is to add the ability for a read transaction to promote to a write 
> transaction.
> API changes are necessary to expose this feature properly and uniformly.
> PR #161 provides the machinery for TDB. To avoid general API changes outside 
> TDB, this happens automatically in {{DatasetGraphTransaction.getW()}} if 
> enabled (by default it isn't, the PR makes no change to behaviour of TDB by 
> default).  It needs to be enabled with {{DatasetGraphTransaction.promotion = 
> true}}. PR#161 does contain internal changes (e.g. {{DatasetGraphWrapper}}) 
> outside TDB.
> This leads towards a general {{begin()}} for transactions. 
> This JIRA is cover discussion on the API and record changes to the subsystems.

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