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Posted to dev@jena.apache.org by "Andy Seaborne (JIRA)" <ji...@apache.org> on 2018/06/06 11:05:00 UTC

[jira] [Resolved] (JENA-1552) Bulk loader for TDB2 (phased loading)

     [ https://issues.apache.org/jira/browse/JENA-1552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne resolved JENA-1552.
---------------------------------
       Resolution: Done
    Fix Version/s: Jena 3.8.0

> Bulk loader for TDB2 (phased loading)
> -------------------------------------
>
>                 Key: JENA-1552
>                 URL: https://issues.apache.org/jira/browse/JENA-1552
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: TDB2
>            Reporter: Andy Seaborne
>            Assignee: Andy Seaborne
>            Priority: Major
>             Fix For: Jena 3.8.0
>
>
> Following on from JENA-1550, this ticket is for phased loading which combined features of the sequential loader and the parallel loader.
> When building all the persistent datastructures (parallel loader), the work on different indexes at the same time is competing for hardware resources, RAM and I/O bandwidth.  As the size to load grows, this becomes a noticeable slowdown.
> The sequential loader is the other extreme of the design spectrum. It does work on one index at a time so as to maximize caching efficiency.
> Phased loading has parallel operation per phase and splits work into subsets of indexes.
> At 200m and loading to rotational disk, an experimental phased loader working with 2 indexes at a time, starts to become faster than parallel on the same hardware as used for the [figures in JENA-1550|https://issues.apache.org/jira/browse/JENA-1550#comment-16484269] (57K parallel, 70K phased).



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