Hello Jose,

I dont believe in a specific IP to be the culprit for
exhausting your connection pool. This is a bit like
thinking in terms of enemies out there on the hostile
internet. I would follow the issue with you logfiles
being owned by root though. That looks serious to me.

There are logfiles at different levels and you might
find out more if you consult all of them e.g. the
dspace log, tomcat log (not written by default), the
apache logs, either access log or error log. postgres
will also write logs. Another way is to take a look
from the outside.

Are you monitoring your machine?
We use the most simplistic thing available, a free
service called mon.itor.us which ticks our machine
on port 80 every fifteen minutes or so and reports
availybility and average round trip time, which is
not much but gives me a baseline so that I know
whether the measures I take are for better of for
worse. You might find out that there is a time pat-
tern, e.g. it gets slow every day at 10pm and you
find similar pattern in the logs. That would be a
better hint. I dont know your platform, but there
has to be some basic facility to log cpu and memory
usage or connection attempts at the network inter-
face level. Maybe your firewall knows about that.
There is cool new tool called dstat for Linux that
I would like to use, but it is not available on
MacOS.

There Error message you posted does not tell me a thing.
If you tell us some more about your system setup, then
maybe, somebody can tell you more, how to track this
down. Beside OS and version numbers of all parts of
your software, regarding the SQL connection errors,
dont forget to include the JDBC connector version.

Is the DB on the same machine? You recently mentioned
that you had issues with large files. Now you tell,
that crawlers also load bitstreams. If your DB is
not on the same machine but communicating over the
same physical interface, the download of bitstreams
might compete for bandwidth with your DB connection.
Maybe this solution is much too complicated, but
you might understand which kind of things are inter-
esting to know about your setup to discuss the type
of problems you reported.

Bye, Christian


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