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From "Daniel Chia (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9265) Add checksum to saved cache files
Date Mon, 27 Jul 2015 06:54:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14642360#comment-14642360
] 

Daniel Chia commented on CASSANDRA-9265:
----------------------------------------

To clarify my question further - it seems we already version the keycache file version, but
we don't seem to guarantee any sort of backwards compatibility. How important would it be
to be able to read version 'b' if we went to version 'c'?

> 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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