[jira] [Created] (COUCHDB-3421) mem3 sync shards WARNING at very low message rate, data doesn't sync

["Scott Kaul (JIRA)" <ji...@apache.org>]

Scott Kaul created COUCHDB-3421:
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             Summary: mem3 sync shards WARNING at very low message rate, data doesn't sync
                 Key: COUCHDB-3421
                 URL: https://issues.apache.org/jira/browse/COUCHDB-3421
             Project: CouchDB
          Issue Type: Bug
          Components: Replication
            Reporter: Scott Kaul


Sending couch messages, as low as 100 messages a second, results in couch falling behind on its replication with other nodes.  In cluster configuration n, w, and r are all set to 2.  While sending these messages, the following warning is observed:

May 17 15:56:54 coreosnode2 docker[26520]: [warning] 2017-05-17T15:56:54.753466Z couchdb-3@couchdb-3.couchdb <0.309.0> -------- mem3_sync shards/20000000-3fffffff/test.1495035040 couchdb-2@couchdb-2.couchdb {pending_changes,151}

Likewise after the message loader is stopped (jmeter) it takes couch a period of time (minutes) to complete replication before the WARNINGs are no longer received and couchDB CPU goes down.

I'm happy to provide a jmx file for jmeter as well as a couple curl commands to delete/create the DB used.



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