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From Robert Coli <rc...@eventbrite.com>
Subject Re: are all files for an sstable immutable?
Date Thu, 16 Oct 2014 18:37:32 GMT
On Thu, Oct 16, 2014 at 10:40 AM, Tyler Hobbs <tyler@datastax.com> wrote:

> The summary files are immutable, but can be replaced periodically.  See
> https://issues.apache.org/jira/browse/CASSANDRA-5519 for more details.
>
> The summary files aren't particularly important, they're primarily an
> optimization for startup time.
>

Users of tablesnap will notice that this means that they are not backed up
in the default config. I believe there's an open bug, but one can
workaround by adding in_move_to (iirc) to the list of events which
tablesnap is watching the data dir for.

But as thobbs says, it doesn't matter if they're not backed up, they are an
optimization and are easy (but somewhat expensive) to regenerate.

=Rob

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