Details
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Improvement
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Status: Closed
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Major
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Resolution: Fixed
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1.0.1
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None
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Committers Level (Medium to Hard)
Description
Wanted to make sure this doesn't get forgotten in the planning for 1.1. Paul Davis and I independently refactored couch_query_servers. Paul's work is much more comprehensive and includes a switch to emonk:
http://github.com/davisp/couchdb/tree/emonk
The work I did is here
http://github.com/kocolosk/couchdb/tree/COUCHDB-901
One feature not included in that branch is the ability to limit the number of OS processes. Should be simple to add if my work ends up being merged. I did the refactor because I was having problems with couch_query_servers "forgetting" about OS processes in BigCouch. One of the ets tables held by couch_query_servers would list thousands of processes (and in fact there were thousands of spawned couchjs), but another table would claim that only two were running. After digging through the code a while I became frustrated with all of the tracking of multiple ets tables and rewrote a server that used only one table. Other changes include
- ability to reuse an OS process when the client that requested it dies.
- better behavior under config changes - doesn't kill all query servers when [query_servers] or [native_query_servers] block changes