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From horschi <hors...@gmail.com>
Subject Re: repair, compaction, and tombstone rows
Date Tue, 06 Nov 2012 20:23:12 GMT
I don't know enough about the code level implementation to comment on the
> validity of the fix.  My main issue is that we use a lot of TTL columns and
> in many cases all columns have a TTL that is less than gc_grace.  The
> problem arises when the columns are gc-able and are compacted away on one
> node but not on all replicas, the periodic repair process ends up copying
> all the garbage columns & rows back to all other replicas.  It consumes a
> lot of repair resources and makes rows stick around for much longer than
> they really should which consumes even more cluster resources.
>
You can set gc_grace to 0 if you never manually delete any of them. You
only need tombstones if you do manual deletes.

Otherwise the two tickets should improve your situation.

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