refactor os process management
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Key: COUCHDB-901
URL: https://issues.apache.org/jira/browse/COUCHDB-901
Project: CouchDB
Issue Type: Improvement
Components: Database Core
Affects Versions: 1.0.1
Reporter: Adam Kocoloski
Fix For: 1.1
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
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