Fedora users,
In trying to expose several collections using the oai provider for fedora
(proai) we encounter intermittent problems that result in the bogging down of
our running fedora repository that persists until the application is restarted.
This happens to the fedora repository even when the oaiprovider is running in
a different tomcat instance on a different machine.
What happens is that occasionally the normal resource index queries that
are used to populate the oai database and cache never return, and appear to
result in a thread left processing forever (the CPU usage remains high,
independent of other operations). At first I thought the problem was simply a
matter of not waiting long enough for the response, but after increasing the
driver.fedora.querySocketTimeout to 3600 (an hour), query still fails to return
on rare occasions.
Attached is the log file for the oai provider. There was nothing but unrelated
access information in the fedora log.
I can understand the query taking a long time, but is seems clear to me that
sometimes (possibly times when other processes are also hitting the resource
index) an error occurs that results in an infinite processing loop.
We're currently running fedora 3.2. We're using the localMulgaraTriplestore
for the resource index. We're going to update to fedora 3.4 soon, but given
that we can't reliably reproduce this error (it's happened once in a couple
weeks) it'll be hard to be confident that it's fixed even if it doesn't occur.
Have other people experienced this problem? What sort of log4j configuration
would capture more relevant information about what the resource index is doing?
Thanks for any information you can provide!
-Mike Durbin
oaiprovider.log
Description: oaiprovider.log
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