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https://issues.apache.org/jira/browse/COUCHDB-487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Joseph Davis updated COUCHDB-487:
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Skill Level: Committers Level (Medium to Hard)
> Pause write requests to allow compaction to complete
> ----------------------------------------------------
>
> Key: COUCHDB-487
> URL: https://issues.apache.org/jira/browse/COUCHDB-487
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Reporter: Robert Newson
> Attachments: block_writes_after_end_of_compaction.patch
>
>
> Continuous writes will currently indefinitely prevent the compaction process
> from flipping over to the .compact file.
> Here's a small patch that adds a new db flag called 'write_available' which
> becomes false the first time compaction completes but fails to flip over
> because of concurrent writes. Subsequent calls to update_docs then sleep for
> 1/2 a second and throw retry.
> I ran 'ab -p json -n 1000000 http://localhost:5984/db1' in one window.
> Without this patch, I get a long sequence of;
> [info] [<0.64.0>] Compaction file still behind main file (update seq=1848.
> compact update seq=1845). Retrying.
> and compaction never completes.
> With the patch, I get this;
> [info] [<0.369.0>] 127.0.0.1 - - 'POST' /db1 201
> [info] [<0.65.0>] Compaction file still behind main file (update seq=2140.
> compact update seq=2092). Retrying.
> [info] [<0.65.0>] Blocking writes to complete compaction.
> [info] [<0.65.0>] Compaction for db "db1" completed.
> [info] [<0.370.0>] 127.0.0.1 - - 'POST' /db1 201
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