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From Adam Kocoloski <kocol...@apache.org>
Subject Re: Recover space imposed by 4K minimum document size?
Date Tue, 30 Jun 2015 00:49:13 GMT
Database compaction should absolutely recover that space. Can you share a few more details?
Are you sure the compaction completes successfully? Cheers,

Adam

> On Jun 29, 2015, at 8:19 PM, Travis Downs <travis.downs@gmail.com> wrote:
> 
> I have an issue where I'm posting single smallish (~500 bytes)
> documents to couchdb, yet the DB size is about 10x larger than
> expected (i.e., 10x larger than the aggregate size of the documents).
> 
> Documents are not deleted or modified after posting.
> 
> It seems like what is happening is that every individual (unbatched
> write) always takes 4K due to the nature of the append-only algorithm
> writing 2 x 2K blocks for each modification as documented here:
> 
> http://guide.couchdb.org/draft/btree.html
> 
> OK, that's fine. What I don't understand is why the "compact"
> operation doesn't recover this space?
> 
> I do recover the space if I replicate this DB somewhere else. The full
> copy takes about 10x less space. I would expect replicate to be able
> to do the same thing in place. Is there some option I'm missing?
> 
> Note that I cannot use bulk writes since the documents are posted one
> by one by different clients.
> 


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