Dmitry Litvintsev

did you apply ``` enable_seqscan = off ``` in DB just to rule that out.

it avoids full scans on queries.

Hi Onno, So we see inability to get connection from connection pool becuase all connections are busy presumably waiting for query results. I do not know what do you mean...

It may! But I was under impression you aleady had patched version. If possible can you deploy latest 9.2? This patch is needed on WebDAV door host(s).

If this helps, that would be the best proof that you should never do a "quick and easy" retry loop to fight race conditions. Hopefully we will fix the occasional...

I still have the old ones, I believe. So, how about this: ``` pnfsmanager.db.connections.max = 30 ``` Above is default valule. Can you set it to 100 (or any number...

> Hi @DmitryLitvintsev I was looking at the code related to this issue. We have the following setting set to true: 'pnfsmanager.enable.parallel-listing'. Which means we only have one listQueue instead...

> The PnfsManager crashed again with "java.util.ConcurrentModificationException: null". > > Around that time (14:12), we saw a surge in database connections.  > > No long Postgres queries around the...

@onnozweers @trancilo You can try, as a way of debugging, to disable folding: `_listQueues` in your case contains single BlockingQueue element. BlockingQueue is thread safe. The fault happens when serializing...

Hi Adrien, I think I can conclude that WebDAV supports relative path, but REST API does not. Correct? While we are at it, can you check if namespace resource of...