[GitHub] redgeoff commented on issue #470: Scheduling Replicator

[gi...@git.apache.org]

redgeoff commented on issue #470: Scheduling Replicator
URL: https://github.com/apache/couchdb/pull/470#issuecomment-297231810
 
 
   Background: https://issues.apache.org/jira/browse/COUCHDB-3391
   
   Summary: I tested the max_jobs config and it doesn't appear to be working as I would expect. Sorry, if I missed a detail.
   
   Steps to reproduce:
   1. Pull and build https://github.com/apache/couchdb/pull/470
   2. Clone https://github.com/redgeoff/couchdb2-replicator-not-scalable-vagrant. I used vagrant to set up my test, but you should be able to run the tests outside a VM as well.
   3. Modify [couchdb2-replicator-not-scalable-vagrant/index.js](https://github.com/redgeoff/couchdb2-replicator-not-scalable-vagrant/blob/master/index.js) and replace localhost with the correct dev DB host
   4. Set the config replicator.max_jobs=10
   5. Run `npm run demo` (this just runs index.js)
   
   => this results in `Unhandled rejection Error: internal_server_error` errors. If you were to modify https://github.com/redgeoff/couchdb2-replicator-not-scalable-vagrant/blob/master/index.js#L10 and use a smaller number, e.g. 10 then there would be no issue as you would not exhaust the file descriptors and db connections. My assumption is that the `max_jobs` config should throttle the replications and prevent the DB from throwing errors.
 
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