On 22.06.09 16:56, Pedro Ferreira wrote: > Hello all, > We occasionally get some messages like this in the logs: > > 2009-06-22T14:12:42 (30651/137.138.128.213:35787) Transaction blocked > waiting for storage. Clients waiting: 1. > > But today we eventually got to: > > 2009-06-22T16:00:11 (30651/137.138.4.153:53416) Transaction blocked > waiting for storage. Clients waiting: 204. > > Which lasted some minutes. During that time, our system seemed to hang, > even if it was possible to connect to the db through the command line. > It eventually went back to normal by itself. > Any clue on what might have caused this? The reason is likely a long running transaction. Since the storage server is single-threaded, a long running transaction will block pending requests.
-aj
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