Benjamin Anderson created COUCHDB-2984:
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Summary: 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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