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https://issues.apache.org/jira/browse/COUCHDB-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15277086#comment-15277086
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ASF GitHub Bot commented on COUCHDB-2984:
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Github user asfgit closed the pull request at:
https://github.com/apache/couchdb-mem3/pull/19
> mem3_sync event listener performance degrades with high q values
> ----------------------------------------------------------------
>
> Key: COUCHDB-2984
> URL: https://issues.apache.org/jira/browse/COUCHDB-2984
> Project: CouchDB
> Issue Type: Improvement
> Reporter: Benjamin Anderson
>
> High throughput applications on databases with high (300+) q values have a
> tendency to cause very poor performance. While I don't fully understand the
> issue at hand, one clear manifestation is in mem3_sync's event listener. With
> high q values, the shard "selection" routine (the <<"shards/",ยท_/binary>>
> head of handle_event/3) will bottleneck on calls to mem3_shards:for_db/1 due
> to the large (tens of KB) shard maps in ETS.
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