Andy Seaborne created JENA-2141:
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Summary: Query timeout may not be seen if during execution
initialization.
Key: JENA-2141
URL: https://issues.apache.org/jira/browse/JENA-2141
Project: Apache Jena
Issue Type: Bug
Components: ARQ
Affects Versions: Jena 4.1.0
Reporter: Andy Seaborne
Assignee: Andy Seaborne
This follows on from Jena-2139. It is the more general case.
This is query 1 from the [report from: Cristóbal Miranda on
users@|https://lists.apache.org/thread.html/r410953678c75caef6e2391081f881b96a9c648ee77ef9aa3748feda9%40%3Cusers.jena.apache.org%3E].
Query cancellation happens when an async timeout call {{queryIterator.abort}}
in QueryExecutionBase.
But {{queryIterator}} is only set after the execution tree of iterators has
been built, bottom-up.
If building takes a long time, the timeout callback can not call {{.abort}}.
The code needs to have a flag setup so it can be set at any time.
The mechanism added in Jena-2139, and similar code in {{QueryIterSort}},
{{QueryIterGroup}} and {{QueryIterTopN}}, which uses delayed initialization is
better when this is possible. However, sometimes it is not easy to know when in
the initialization phase.
One possibility is adding this to the {{ExecutionContext}}which exists and is
passed to all query iterators during the setup phase.
{{QueryExecutionBase}} is being renamed as {{QueryExecDataset}} in
[PR#1003|https://github.com/apache/jena/pull/1030]
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