Native query server show function does not respect os_process_timeout setting
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Key: COUCHDB-991
URL: https://issues.apache.org/jira/browse/COUCHDB-991
Project: CouchDB
Issue Type: Bug
Components: Database Core
Affects Versions: 1.0.1
Environment: Mac OSX 10.6; CouchDB/1.0.1 (Erlang OTP/R13B)
Reporter: Paul Mietz Egli
I have a design document containing show functions written in Erlang for
performance reasons, and I found that some calls to these shows were timing out
after about eight seconds (according to curl). I increased os_process_timeout
to 300000 but still saw the show timing out after seven or eight seconds. Log
shows:
{code:none}
{exit, {timeout, {gen_server,call, [<0.135.0>,{prompt,[my data]}]}}}
{code}
I asked about this problem in IRC, and kocolosk said that the problem is that
couch_native_process only checks the timeout for a couple of commands, like
list_row. The gen_server:call/2 function is timing out because
ddoc(...<<"show">>) is taking more than five seconds to process. Changing line
63 to the following prevents the timeout:
{code:none}
gen_server:call(Pid, {prompt, Data}, infinity)
{code}
Ideally, though, each run/2 call in couch_native_process would respect the
configured timeout value. Workaround for now is to wrap the
ddoc(..<<"shows">>..) call in a timer using State#evstate.timeout as a
duration (thanks for the solution, kocolosk!).
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