Hi Andrea,
Thanks for the information! That worked perfectly. For documentation's
sake I want to clear up one thing, namely that the write.lock file is
not one of the files in /var/dspace/search that gets updated when
items are added/edited/deleted. It is created when there is an
interruption of some kind. (You may have meant this, Andrea, but I
wanted to make sure it was stated explicitly.)

This thread talks about that in more detail:
http://www.mail-archive.com/[email protected]/msg10873.html

Spencer

Re: [Dspace-tech] Slow response to submitting/deleting items and
editing metadata

Andrea Schweer
Tue, 07 Dec 2010 12:15:49 -0800

Hi Spencer,

On 08/12/10 09:00, Spencer Lamm wrote:
> We're running DSpace 1.5.1 and Postgres 8.1.11 on a Linux machine.
> In the last week we've been experiencing significant slowdowns; it
> now takes about 30 seconds to add or delete items or metadata. If
> anybody has suggestions for how to start tackling this, they would be
> greatly appreciated. To date, we have done the following:

I was having similar issues with one of my DSpace instances the other
day. In my case it turned out that there was a stale lock file in the
index directory, which led to delays when DSpace tried (and failed) to
update the search/browse indexes.

Have a look in your [dspace]/search directory (or wherever else your
search.dir parameter in dspace.cfg points to). In particular, check
- when the files in the directory were last modified (as far as I know,
these files should be updated basically whenever you add/delete an item
or change an item's metadata)
- whether there is a file in that directory with the extension .lock or
.lck (sorry I can't remember which one it was)

I could solve this by manually deleting the lock file and then manually
updating the indexes once ([dspace]/bin/index-update).

Also, make sure you always update the indexes as the standard dspace
user (in our case tomcat, but I think it'd be dspace if you followed the
standard installation instructions) so that the file permissions in
[dspace]/search are correct. Incorrect permissions for this directory
and its files may be another reason for the delays you're seeing, if
indeed they are linked to index updates.

Hope this helps.

cheers,
Andrea

-- 
Andrea Schweer
IRR Technical Specialist, ITS Information Systems
The University of Waikato, Hamilton, New Zealand

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--
Spencer Lamm
Digital Initiatives Librarian
Swarthmore College Library
[email protected]
610-328-8541

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