On Fri, Aug 10, 2012 at 5:54 AM, Fredrik <fredrik.l.stigb...@sitevision.se>wrote:
> We've had a bug that caused one of our column families to grow very big > 280 GB on a 500 GB disk. We're using size tiered compaction. > Since it's "only append" data I've now issued deletes of 260 GB of > superflous data. > > 1. There are som quite large SSTables (80 GB, 40 GB etc..). If I run a > major compaction before GC grace, which is 6 hours, will the compaction > succeed or will it fail due to the GC grace hasn't elapsed and thus major > compaction will ignore the tombstones and then fail due to insufficient > disk space? > The major compaction would fail, because the tombstones could not be purged yet. > > 2. If I wait until GC grace has elapsed, will it be possible to run a > major compaction since there are only deletes which doesn't require double > amount of SStable size when merging tombstones with the large SSTables? > Yes, although it's a better idea to let minor compactions take care of that. -- Tyler Hobbs DataStax <http://datastax.com/>
