[jira] [Commented] (JENA-44) Support external sorting of bindings in ARQ

["Paolo Castagna (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JENA-44?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13015300#comment-13015300 ] 

Paolo Castagna commented on JENA-44:
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Currently, a large sort done externally cannot be canceled or, more precisely, even if cancel() is invoked or a timeout is set, the external sort once started it cannot be interrupted.
We should make it checking a flag which will be set if requestCancel() is called and stop the sorting as soon as possible once the flag has been set.

> Support external sorting of bindings in ARQ
> -------------------------------------------
>
>                 Key: JENA-44
>                 URL: https://issues.apache.org/jira/browse/JENA-44
>             Project: Jena
>          Issue Type: New Feature
>          Components: ARQ
>            Reporter: Sam Tunnicliffe
>            Assignee: Paolo Castagna
>            Priority: Minor
>         Attachments: JENA-44-0.patch, JENA-44_ARQ_r8531.patch
>
>
> In QueryIterSort, the sorting of the contents of an Iterator<Binding> is done in memory, using Arrays.sort. This can be problematic where the set to be sorted is large. A possible solution could be to use an external, disk-backed algorithm. A hybrid approach may be better, whereby we attempt the in-memory sort, but when the number of bindings encountered goes over a certain number, resort to the disk-backed variant.

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