> Also when hints are replayed they are sent of as mutations, which may still > be dropped by the target if they are not serviced before rpc_timeout. Sending > nodes throttle their requests so it's unlikely but possible.
My bad there. I thought the mutations were send one way. When node is sending hints it waits the normal rpc_timeout. If there is a time out hint delivery for that endpoint is aborted. It will be re-tried the in the next HH round, which is every 10 minutes. Cheers ----------------- Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 23/08/2012, at 9:36 PM, aaron morton <aa...@thelastpickle.com> wrote: > HH works to a point. Specifically, it only collects hints for the first hour > the node is down and it has a safety valve to avoid the node collecting hints > getting overwhelmed. Looking at the code it takes a bit for that the trip and > you would get a TimeoutException coming back. > > Also when hints are replayed they are sent of as mutations, which may still > be dropped by the target if they are not serviced before rpc_timeout. Sending > nodes throttle their requests so it's unlikely but possible. > > HH is is much more robust, but AFAIK repair is still _the_ way to ensure on > disk consistency. > > Cheers > > ----------------- > Aaron Morton > Freelance Developer > @aaronmorton > http://www.thelastpickle.com > > On 23/08/2012, at 6:59 AM, Rob Coli <rc...@palominodb.com> wrote: > >> On Wed, Aug 22, 2012 at 8:37 AM, Senthilvel Rangaswamy >> <senthil...@gmail.com> wrote: >>> We are running Cassandra 1.1.2 on EC2. Our database is primarily all >>> counters and we don't do any >>> deletes. >>> >>> Does nodetool repair do anything for such a database. All the docs I read >>> for nodetool repair suggests >>> that nodetool repair is needed only if there is deletes. >> >> Since 1.0, repair is only needed if a node crashes. If a node crashes, >> my understanding is that a cluster-wide repair (with -pr on each node) >> is required, because the crashed node could have lost a hint for any >> other node. >> >> https://issues.apache.org/jira/browse/CASSANDRA-2034 >> >> =Rob >> >> -- >> =Robert Coli >> AIM>ALK - rc...@palominodb.com >> YAHOO - rcoli.palominob >> SKYPE - rcoli_palominodb >
