Hi all,
currently, DIH's import operation(s) only works asynchronously.
Therefore, after submitting an import request, DIH returns immediately,
while the import process (in case a large amount of data needs to be
indexed) continues asynchronously behind the scenes.
So, what is the recommended way to check if the import process has
already finished? Or still better, is there any method / workaround that
will block the import operation's caller until the operation has finished?
In my application, the DIH receives some URL parameters which are used
for determining the database name that is used within data-config.xml, e.g.
http://localhost:8983/solr/dataimport?command=full-import&dbname=foo
Since only one DIH, /dataimport, is defined, but several database needs
to be indexed, it is required to issue this command several times, e.g.
http://localhost:8983/solr/dataimport?command=full-import&dbname=foo
... wait until /dataimport?command=status says "Indexing completed" (but
without using a loop that checks it again and again) ...
http://localhost:8983/solr/dataimport?command=full-import&dbname=bar&clean=false
A suitable solution, at least IMHO, would be to have an additional DIH
parameter which determines whether the import call is blocking on
non-blocking, the default. As far as I see, this could be accomplished
since Solr can execute more than one import operation at a time (it
starts a new thread for each). Perhaps, my question is somehow related
to the discussion [1] on ParallelDataImportHandler.
Best,
Sascha
[1] http://www.lucidimagination.com/search/document/a9b26ade46466ee
