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https://issues.apache.org/jira/browse/CONNECTORS-618?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13559200#comment-13559200
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Karl Wright edited comment on CONNECTORS-618 at 1/22/13 2:30 AM:
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r1436686 (trunk)
r1436727 (release branch)
was (Author: [email protected]):
r1436686 (trunk)
I will wait to pull this into the release branch until Shigeki has tried it.
> MySQL orders null values to the front of the index, which breaks the stuffing
> query
> -----------------------------------------------------------------------------------
>
> Key: CONNECTORS-618
> URL: https://issues.apache.org/jira/browse/CONNECTORS-618
> Project: ManifoldCF
> Issue Type: Bug
> Components: Framework core
> Affects Versions: ManifoldCF 1.0.1, ManifoldCF 1.1
> Reporter: Karl Wright
> Assignee: Karl Wright
> Fix For: ManifoldCF 1.1
>
>
> MySQL attempts to read all null values from the docpriority index before it
> encounters anything useful. If there are a lot of records from other stopped
> jobs around, this makes ManifoldCF stuffing very slow.
> There is no way to cause MySQL to order null values in indexes differently,
> unfortunately. So the only options are:
> (1) Use a special value instead of NULL, which is problematic because this
> column contains a float, and therefore has rounding errors;
> (2) Use null, but order the index backwards in the case of MySQL. This
> implies that we need to actually change what we put in as a data value based
> on database type - doable but also definitely scary.
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