roman created SOLR-3671:
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Summary: DIH doesn't use its own interface + writerImpl has no
information about the request
Key: SOLR-3671
URL: https://issues.apache.org/jira/browse/SOLR-3671
Project: Solr
Issue Type: Improvement
Components: contrib - DataImportHandler
Affects Versions: 4.0-ALPHA, 4.0
Reporter: roman
Fix For: 4.0
The use case: I would like to extend DIH by providing a new writer, I have
tried everything but can't accomplish it without either a) duplicating whole
DIHandler or b) java reflection tricks. Almost everything inside DIH is private
and the mechanism to instantiate a new writer based on the 'writerImpl'
mechanism seems lacking important functionality
It doesn't give the new class a chance to get information about the request,
update processor. Also, the writer is instantiated twice (when 'writerImpl' is
there), which is really unnecessary.
As a solution, the existing DIHandler.getSolrWriter() should instantiate the
appropriate writer and send it to DocBuilder (it is already doing that for
SolrWriter). And DocBuilder doesn't need to create a second (duplicate) writer
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