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Jonathan Ellis commented on CASSANDRA-9265:
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Throwing out the cache isn't a showstopper since we can always rebuild it, but
it will hurt performance until it's done. Upgrading an entire cluster will be
slower since you need to wait longer between machines. So if possible it's
nice to preserve compatibility.
> Add checksum to saved cache files
> ---------------------------------
>
> Key: CASSANDRA-9265
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9265
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Ariel Weisberg
> Fix For: 3.x
>
>
> Saved caches are not covered by a checksum. We should at least emit a
> checksum. My suggestion is a large checksum of the whole file (convenient
> offline validation), and then smaller per record checksums after each record
> is written (possibly a subset of the incrementally maintained larger
> checksum).
> I wouldn't go for anything fancy to try to recover from corruption since it
> is just a saved cache. If corruption is detected while reading I would just
> have it bail out. I would rather have less code to review and test in this
> instance.
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