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Jonathan Ellis commented on CASSANDRA-2045:
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bq. Doesn't this mean that, given a very unstable cluster (e.g. EC2) writes
using CL.ANY can cause nodes to fill up with data unexpectedly quickly?
Sort of. It means you can fill up by at most 1/RF faster than you thought,
yes, since rows can only be stored on at most once node that is not a replica
(the coordinator). The correct fix to that is "stabilize your cluster." :)
bq. It's probably a good idea to try to retain backwards compatibility here as
much as possible so that rolling upgrades of a cluster is possible
Right, but as discussed above we're not planning to move to materialized-hints
entirely, so ripping out "classic" hints isn't an option anyway.
bq. I think Edward's idea of storing hints in a per-node CommitLog is a pretty
elegant solution, unfortunately it's quite a lot more invasive and would be a
nightmare for maintaining backwards compatibility.
serialized mutation objects as columns in a row is pretty close to commitlog
format, only you can query it w/ normal tools.
> Simplify HH to decrease read load when nodes come back
> ------------------------------------------------------
>
> Key: CASSANDRA-2045
> URL: https://issues.apache.org/jira/browse/CASSANDRA-2045
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Chris Goffinet
> Fix For: 1.0
>
>
> Currently when HH is enabled, hints are stored, and when a node comes back,
> we begin sending that node data. We do a lookup on the local node for the row
> to send. To help reduce read load (if a node is offline for long period of
> time) we should store the data we want forward the node locally instead. We
> wouldn't have to do any lookups, just take byte[] and send to the destination.
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