Re: [sr-dev] git:master: db_cluster: new module for generic database clustering

On 03/27/2012 03:44 PM, Daniel-Constantin Mierla wrote: Hello Daniel, I have a few questions regarding the db_cluster module and especially the way it deals with errors: For serial operation , lets consider two handlers DB1 and DB2 with the same priority. For the first write operation DB1 lets presume that itfails so the insert is done on DB2 (network congestion, mysql deadlock etc). But for a serial select the first DB1 is chosen (I looked thru the code and I see no ways of caching the initial error) and this means that the info returned from DB1 (it might be insert_update or update so info might be also present in DB1). How does the module handle this? Same scenarios and question I think it applies with round-robin mode as well. The way we do this in p_usrloc is by keeping a error counter per each handler that is associated with a state (on -off) and a timestamp (when it failed). This info can be used to disable usage of the DB handler( and later put the handler in Write-Only mode until the data is synchronized ) Cheers, Marius