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https://issues.apache.org/jira/browse/COUCHDB-3054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15371006#comment-15371006
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Robert Newson commented on COUCHDB-3054:
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my final statement about closing dbs is false as it turns out, obviously it
reopens the db in order to keep_sending_changes
> chttpd cache invalidation is slow
> ---------------------------------
>
> Key: COUCHDB-3054
> URL: https://issues.apache.org/jira/browse/COUCHDB-3054
> Project: CouchDB
> Issue Type: Bug
> Reporter: Robert Newson
>
> The chttpd_auth_cache module follows the changes feed of the clustered _users
> database in order to invalidate the cache whenever a document changes.
> This can take over a minute to occur. It turns out we kill the changes feed
> process when we receive a heartbeat and restart the feed, leading to a long
> delay.
> We do want to stop periodically in order to close databases that might have
> been compacted.
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