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https://issues.apache.org/jira/browse/SOLR-1920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496541#comment-13496541
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James Dyer commented on SOLR-1920:
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possibly, the fields/values from the last document added could be all stored in
the properties file. This would mean you'd have to sort your documents by the
autoincrement field so that the highest one is guaranteed to be last.
Another possibility is to have it go out and execute a query to get the values
from the database in a special "get the properties" query. This would be like
SOLR-3365, where the user wants to get "last_index_time" from the database
rather than from the Solr server's clock as currently done. To implement
SOLR-3365, I imagine letting the user specify a query like "select
CURRENT_TIMESTAMP as 'last_index_time' from dual" . It would be just as easy
to let any set of properties be put in such a query, for instance, "select
max(autoincrement_field) from mytable". So maybe something can be written that
would solve both issues?
> Need generic placemarker for DIH delta-import
> ---------------------------------------------
>
> Key: SOLR-1920
> URL: https://issues.apache.org/jira/browse/SOLR-1920
> Project: Solr
> Issue Type: Improvement
> Components: contrib - DataImportHandler
> Reporter: Shawn Heisey
> Priority: Minor
> Fix For: 4.1
>
>
> The dataimporthandler currently is only capable of saving the index timestamp
> for later use in delta-import commands. It should be extended to allow any
> arbitrary data to be used as a placemarker for the next import.
> It is possible to use externally supplied variables in data-config.xml and
> send values in via the URL that starts the import, but if the config can
> support it natively, that is better.
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