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Sylvain Lebresne commented on CASSANDRA-3868:
---------------------------------------------
bq. but it is an extremely effective pressure release valve
I don't disagree about the efficiency of the valve, but at what price?
'Bootstrapping a node *will* make you lose increments (you don't know which
ones, you don't know how many and this even if nothing goes wrong)' is a pretty
bad drawback. That is pretty much why that option makes me uncomfortable: it
does give you better performance, so people may be tempted to use it. Now if it
was only a matter of replicating writes only through read-repair/repair, then
ok, it's pretty dangerous but it's rather easy to explain/understand the
drawback (if you don't lose a disk, you don't lose increments, and you'd better
use CL.ALL or have read_repair_chance to 1). But the fact that it doesn't work
with bootstrap/move makes me wonder if having the option at all is not making a
disservice to users.
But anyway, if we prefer keeping the option, I can live with that. But at least
I think we should probably log a warning message when users turn it off and add
the same warnings everywhere the option is documented.
> Remove or nullify replicate_on_write option
> -------------------------------------------
>
> Key: CASSANDRA-3868
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3868
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 0.8.0
> Reporter: Brandon Williams
> Fix For: 1.1.0
>
> Attachments: 3868.txt
>
>
> My understanding from Sylvain is that setting this option to false is rather
> dangerous/stupid, and you should basically never do it. So 1.1 is a good
> time to get rid of it, or make it a no-op.
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