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https://issues.apache.org/jira/browse/COUCHDB-1171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Newson resolved COUCHDB-1171.
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Resolution: Fixed
> Multiple requests to _changes feed causes {error, system_limit} "Too many
> processes"
> ------------------------------------------------------------------------------------
>
> Key: COUCHDB-1171
> URL: https://issues.apache.org/jira/browse/COUCHDB-1171
> Project: CouchDB
> Issue Type: Bug
> Affects Versions: 1.0.2, 1.1, 1.0.3
> Reporter: Alexander Shorin
> Assignee: Robert Newson
> Fix For: 1.0.3, 1.2, 1.1
>
> Attachments: couchdb-changes-stats-process-leak-test.js,
> couchdb-changes-stats-process-leak.patch
>
>
> Originally I have investigated of issue 182 of couchdb-python package where
> calling db.changes() function over 32768 times generates next messages in
> CouchDB log:
> [Thu, 19 May 2011 14:03:26 GMT] [info] [<0.2909.0>] 127.0.0.1 - - 'GET'
> /test/_changes 200
> [Thu, 19 May 2011 14:03:26 GMT] [error] [emulator] Too many processes
> [Thu, 19 May 2011 14:03:26 GMT] [error] [<0.2909.0>] Uncaught error in HTTP
> request: {error,system_limit}
> [Thu, 19 May 2011 14:03:26 GMT] [info] [<0.2909.0>] Stacktrace:
> [{erlang,spawn,
> [erlang,apply,
> [#Fun<couch_stats_collector.1.123391259>,[]]]},
> {erlang,spawn,1},
> {couch_httpd_db,handle_changes_req,2},
> {couch_httpd_db,do_db_req,2},
> {couch_httpd,handle_request_int,5},
> {mochiweb_http,headers,5},
> {proc_lib,init_p_do_apply,3}]
> [Thu, 19 May 2011 14:03:26 GMT] [info] [<0.2909.0>] 127.0.0.1 - - 'GET'
> /test/_changes 500
> More info about this issue could be found there:
> http://code.google.com/p/couchdb-python/issues/detail?id=182
> However, I still couldn't reproduce this error using only httplib module, but
> I've got that same behavior using feed=longpool option:
> from httplib import HTTPConnection
> def test2():
> conn = HTTPConnection('localhost:5984')
> conn.connect()
> i = 0
> while(True):
> conn.putrequest('GET', '/test/_changes?feed=longpool')
> conn.endheaders()
> conn.getresponse().read()
> i = i + 1
> if i % 100 == 0:
> print i
> When i get's around 32667 exception raises
> Traceback (most recent call last):
> File "/home/kxepal/projects/couchdb-python/issue-182/test.py", line 259, in
> <module>
> test2()
> File "/home/kxepal/projects/couchdb-python/issue-182/test.py", line 239, in
> test2
> resp.read()
> File "/usr/lib/python2.6/httplib.py", line 522, in read
> return self._read_chunked(amt)
> File "/usr/lib/python2.6/httplib.py", line 565, in _read_chunked
> raise IncompleteRead(''.join(value))
> httplib.IncompleteRead: IncompleteRead(0 bytes read)
> [Thu, 19 May 2011 14:10:20 GMT] [info] [<0.3240.4>] 127.0.0.1 - - 'GET'
> /test/_changes?feed=longpool 200
> [Thu, 19 May 2011 14:10:20 GMT] [error] [emulator] Too many processes
> [Thu, 19 May 2011 14:10:20 GMT] [error] [<0.3240.4>] Uncaught error in HTTP
> request: {error,system_limit}
> [Thu, 19 May 2011 14:10:20 GMT] [info] [<0.3240.4>] Stacktrace:
> [{erlang,spawn,
> [erlang,apply,
> [#Fun<couch_stats_collector.1.123391259>,[]]]},
> {erlang,spawn,1},
> {couch_httpd_db,handle_changes_req,2},
> {couch_httpd_db,do_db_req,2},
> {couch_httpd,handle_request_int,5},
> {mochiweb_http,headers,5},
> {proc_lib,init_p_do_apply,3}]
> [Thu, 19 May 2011 14:10:20 GMT] [info] [<0.3240.4>] 127.0.0.1 - - 'GET'
> /test/_changes?feed=longpool 500
> Same error. I know, that test function is quite outside from real use case,
> but is this correct behavior and couldn't it be used in malicious aims?
> This exception occurres only for multiple requests within single connection
> for changes feed, chunked lists or attachments are not affected, if I've done
> all right.
> Test environment:
> Gentoo Linux 2.6.38
> CouchDB 1.0.2 release
> couchdb-python@63feefd9e3b6
> Python 2.6.6
> If there is needed some additional information I could try to provide it.
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