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From "James Dyer (JIRA)" <>
Subject [jira] [Commented] (SOLR-2613) DIH Cache backed w/bdb-je
Date Fri, 05 Aug 2011 15:59:27 GMT


James Dyer commented on SOLR-2613:

Try a non-Oracle implementation.
I understand the difficulties with bdb-je.  When I selected this, I though it would be ok
to use because the Lucene db-contrib used it.  But since then "db" has gone away, partly because
of this dependency, partly because there were no unit tests.  

An ant target
At least 1 commiter here was outraged that the Lucene build would automatically download a
non-compatible-license file when doing a building the old db-contrib module, so I shy away
from that option.  I thought about creating a mock-bdb jar that would just throw a special
exception when you try to use it (then the unit tests can just print out a warning and users
who want to really test/use the functionality could get bdb from Oracle).  I thought about
apache-extras, but it would be easy for this to become out-of-sync with the rest of the project.
 I also have a lucene-backed-cache that I wrote to help set up testing scenario.  I could
contribute that and it would probably perform for many uses.  Others with more Lucene experience
might improve it and maybe it could perform as good as the bdb-je one?  There's a lot of options
but its all moot for the moment because the prerequsites in SOLR-2382 are not yet committed.

A way to pre-load the backing database
You can pre-load the caches with DIHCacheWriter.  You then use DIHCacheProcessor to read the
data back in later.  See TestDIHCacheWriterAndProcessor in SOLR-2382.  Is this what you mean?

> DIH Cache backed w/bdb-je
> -------------------------
>                 Key: SOLR-2613
>                 URL:
>             Project: Solr
>          Issue Type: Improvement
>          Components: contrib - DataImportHandler
>    Affects Versions: 4.0
>            Reporter: James Dyer
>            Priority: Minor
>         Attachments: SOLR-2613.patch, SOLR-2613.patch, SOLR-2613.patch, SOLR-2613.patch
> This is spun out of SOLR-2382, which provides a framework for multiple cacheing implementations
with DIH.  This cache implementation is fast & flexible, supporting persistence and delta
updates.  However, it depends on Berkley Database Java Edition so in order to evaluate this
and use it you must download bdb-je from Oracle and accept the license requirements.

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