Hi all,
I finally got around to trying this out on our dev server: updated the “handle”
table to point two different handles to the one resource_id (and none to the
withdrawn resource_id). It seemed in the first instance to work – following the
links did what I expected.
Then I tried running the index-discovery -b job. That kept stopping
mysteriously in the middle of it – no obvious errors in the solr or dspace
logs, just stopped. (I don’t know, maybe our dev server’s just slow and ran out
of memory or got distracted or something.) But running index-discovery with no
options picked up where it left off, and after a couple of repetitions of this
it finally indexed the item in question and all my search/browse tests worked
as expected too.
So I was on the verge of declaring victory – and then I ran an oai import -c -v
job. To my tremendous disappointment that failed partway through with:
Item with handle null indexed
org.apache.solr.client.solrj.impl.HttpSolrServer$RemoteSolrException: Document
is missing mandatory uniqueKey field: item.handle
at
org.apache.solr.client.solrj.impl.HttpSolrServer.executeMethod(HttpSolrServer.java:552)
at
org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:210)
at
org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:206)
at
org.apache.solr.client.solrj.request.AbstractUpdateRequest.process(AbstractUpdateRequest.java:124)
at org.apache.solr.client.solrj.SolrServer.add(SolrServer.java:116)
at org.apache.solr.client.solrj.SolrServer.add(SolrServer.java:102)
at org.dspace.xoai.app.XOAI.index(XOAI.java:213)
at org.dspace.xoai.app.XOAI.indexAll(XOAI.java:200)
at org.dspace.xoai.app.XOAI.index(XOAI.java:131)
at org.dspace.xoai.app.XOAI.main(XOAI.java:495)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:57)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at
org.dspace.app.launcher.ScriptLauncher.runOneCommand(ScriptLauncher.java:226)
at org.dspace.app.launcher.ScriptLauncher.main(ScriptLauncher.java:78)
This makes sense in retrospect: the OAI feed includes withdrawn items (in order
to publish a “record status: deleted” record) but identifies them by their
handles (so obviously requires a handle).
This is highly disappointing, but at least now we know. It looks like it would
work for a repository which didn’t publish an OAI feed, but sadly that’s vital
for us.
Our fall-back will be to follow Claudia’s suggestion of adjusting the Item
Withdrawn page and using the metadata to point to the new item.
Deborah
From: Tim Donohue <tdono...@duraspace.org>
Sent: Friday, 15 June 2018 2:42 AM
To: Fitchett, Deborah <deborah.fitch...@lincoln.ac.nz>
Cc: dspace-tech@googlegroups.com
Subject: Re: [dspace-tech] handles, isreplacedby, and withdrawn items
Hi Deborah,
I'll admit, I've never tried this myself, but your suggestion to simply update
the old "handle" table entries to point at the new "resource_id" seems like it
*should work*. The "handle" table in DSpace is really just used to
resolve/assign Handles to Objects. So, at least conceptually, it should
support pointing two handles at the same object (Item).
That said, I'd recommend first trying this out on a test or development server.
I think it should work, but it'd be worth testing more thoroughly how DSpace
behaves when one Item object has multiple Handles (and for example, whether
both handles appear on the Item splash page, etc). I'd recommend testing basic
functionality like browse/search/reindex. I suspect they all should work, but
as this isn't a documented feature, it's worth double checking.
Let us know how it goes (please report back on this list), as this seems like
it might be of interest to others.
- Tim
On Wed, Jun 13, 2018 at 11:51 PM Fitchett, Deborah
<deborah.fitch...@lincoln.ac.nz<mailto:deborah.fitch...@lincoln.ac.nz>> wrote:
Kia ora all,
We’re occasionally getting duplicate records created in Dspace with no way to
resolve the issue other than to withdraw the earlier record and go forward with
the more recent one.(1)
But of course we don’t really want the handle of the earlier record to result
in a dead-end – we’d like it to resolve to the new record, or at least be
redirected there.
We have metadata fields dc.relation.isreplacedby and dc.relation.replaces.
These seem to have no functional purpose in Dspace (ie it doesn’t do any
automatic redirects), it’s just information. If the item is *not* withdrawn, I
could add some javascript to the page to accomplish the redirect that way. But
I’m not sure it’s the cleanest way.
I’m looking at the handle table in the database and wondering – what if I
simply find the row with the handle that’s currently linked to the old record,
and update it to point to the resource_id of the new record(2)? Then we could
withdraw the old record but people following the old link would still get to
what they want. Would this do what I’m thinking? Would there be any problems
I’m not seeing with having two handles point to the same record?
And/or is there a better way? How would you deal with a case like this?
Deborah
(1) Due to synchronisation with Symplectic Elements which works 99.9% of the
time but not 100%.
(2) I’m happy messing directly in the database in general, having done it
with the metadatavalue table a pile of times – obviously always with much
testing and great care. I haven’t touched the handle table before though.
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