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https://issues.apache.org/jira/browse/COUCHDB-220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695898#action_12695898
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Robert Newson commented on COUCHDB-220:
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I wanted to capture the thread, so that others will have a fuller context.
I don't think we've found the source yet. For example, I commented out the
ensure_buffer call and I still get the problem, so I don't think adding the
flag you suggested will actually help.
> Extreme sparseness in couch files
> ---------------------------------
>
> Key: COUCHDB-220
> URL: https://issues.apache.org/jira/browse/COUCHDB-220
> Project: CouchDB
> Issue Type: Bug
> Components: Database Core
> Affects Versions: 0.9
> Environment: ubuntu 8.10 64-bit, ext3
> Reporter: Robert Newson
>
> When adding ten thousand documents, each with a small attachment, the
> discrepancy between reported file size and actual file size becomes huge;
> ls -lh shard0.couch
> 698M 2009-01-23 13:42 shard0.couch
> du -sh shard0.couch
> 57M shard0.couch
> On filesystems that do not support write holes, this will cause an order of
> magnitude more I/O.
> I think it was introduced by the streaming attachment patch as each
> attachment is followed by huge swathes of zeroes when viewed with 'hd -v'.
> Compacting this database reduced it to 7.8mb, indicating other sparseness
> besides attachments.
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