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https://issues.apache.org/jira/browse/COUCHDB-1651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579479#comment-13579479
]
Christopher Bonhage commented on COUCHDB-1651:
----------------------------------------------
Alright, I've figured out what's going on!
I added some logging to couch_httpd_rewrite:handle_rewrite_req/3:
MaxRewritesList = couch_config:get("httpd", "rewrite_limit", "100"),
MaxRewrites = list_to_integer(MaxRewritesList),
RewriteCount =
case get(couch_rewrite_count) of
undefined -> 0;
Count -> Count
end,
?LOG_INFO("rewrite recursion depth ~B/~B", [RewriteCount, MaxRewrites]),
case RewriteCount of
NumRewrites when NumRewrites < MaxRewrites ->
put(couch_rewrite_count, NumRewrites + 1);
_ ->
throw({bad_request, <<"Exceeded rewrite recursion limit">>})
end,
I noticed the problem immediately: CouchDB is reusing request processes, but
not clearing the couch_rewrite_count in the process dictionary!
Apache CouchDB has started. Time to relax.
[info] [<0.36.0>] Apache CouchDB has started on http://0.0.0.0:5984/
[info] [<0.36.0>] Apache CouchDB has started on https://0.0.0.0:6984/
[info] [<0.134.0>] rewrite recursion depth 0/100
[info] [<0.134.0>] 127.0.0.1 - - GET /testdb/testapp/apps/testapp.html 200
[info] [<0.134.0>] rewrite recursion depth 1/100
[info] [<0.134.0>] 127.0.0.1 - - GET
/testdb/testapp/stylesheets/testapp/screen.css 200
[info] [<0.134.0>] rewrite recursion depth 2/100
[info] [<0.134.0>] 127.0.0.1 - - GET
/testapp/_design/testapp/_list/image_json/images?_=1360958246705 200
[info] [<0.134.0>] rewrite recursion depth 3/100
[info] [<0.134.0>] 127.0.0.1 - - GET
/testapp/396/images/1.jpg?key=396&file=1.jpg 200
[info] [<0.134.0>] rewrite recursion depth 4/100
[info] [<0.134.0>] 127.0.0.1 - - GET /testdb/testapp/apps/testapp.html 200
[info] [<0.134.0>] rewrite recursion depth 5/100
[info] [<0.134.0>] 127.0.0.1 - - GET
/testdb/testapp/stylesheets/testapp/screen.css 304
[info] [<0.134.0>] rewrite recursion depth 6/100
[info] [<0.134.0>] 127.0.0.1 - - GET
/testapp/_design/testapp/_list/image_json/images?_=1360958261344 200
[info] [<0.134.0>] rewrite recursion depth 7/100
[info] [<0.134.0>] 127.0.0.1 - - GET
/testapp/_design/testapp/_list/value_json/all?startkey=%5B%5D&endkey=%5B%7B%7D%5D
304
[info] [<0.134.0>] rewrite recursion depth 8/100
[info] [<0.134.0>] 127.0.0.1 - - GET
/testapp/245/images/1.jpg?key=245&file=1.jpg 200
[info] [<0.134.0>] rewrite recursion depth 9/100
[info] [<0.134.0>] 127.0.0.1 - - GET
/testapp/389/images/2.jpg?key=389&file=2.jpg 200
[info] [<0.134.0>] rewrite recursion depth 10/100
[info] [<0.134.0>] 127.0.0.1 - - GET
/testapp/389/images/1.jpg?key=389&file=1.jpg 200
A quick search through the codebase confirms this:
Searching 130 files for "couch_rewrite_count" (case sensitive)
couchdb/src/couchdb/couch_httpd_rewrite.erl:
123 MaxRewritesList = couch_config:get("httpd", "rewrite_limit", "100"),
124 MaxRewrites = list_to_integer(MaxRewritesList),
125: case get(couch_rewrite_count) of
126 undefined ->
127: put(couch_rewrite_count, 1);
128 NumRewrites when NumRewrites < MaxRewrites ->
129: put(couch_rewrite_count, NumRewrites + 1);
130 _ ->
131 throw({bad_request, <<"Exceeded rewrite recursion limit">>})
3 matches in 1 file
> Server responds 400 "Exceeded rewrite recursion limit" indefinitely
> -------------------------------------------------------------------
>
> Key: COUCHDB-1651
> URL: https://issues.apache.org/jira/browse/COUCHDB-1651
> Project: CouchDB
> Issue Type: Bug
> Components: HTTP Interface
> Reporter: Paul Frazee
>
> Running 1.2.1 on Windows 7 as a service.
> hosts file includes "127.0.0.1 grimwire.local"
> CouchDB conf includes vhosts entries:
> grimwire.local:5984 /grimwire/_design/grimwire/_rewrite
> grimwire.local:5984/local /grimwire/_design/local/_rewrite
> 'grimwire' design doc rewrites:
> [
> {
> "from": "",
> "to": "index.html",
> "method": "GET"
> },
> {
> "from": "*",
> "to": "*"
> }
> ]
> 'local' design doc rewrites:
> [
> {
> "from":"",
> "to":"index.html",
> "method":"GET"
> },
> {
> "from":"/posts",
> "to":"_list/wallpost/wallpost-by-created_at",
> "method":"GET"
> },
> {
> "from":"/posts",
> "to":"_update/wallpost",
> "method":"POST"
> },
> {
> "from":"/posts/:id",
> "to":"_show/wallpost/:id",
> "method":"GET"
> },
> {
> "from":"/posts/:id",
> "to":"_update/wallpost/:id",
> "method":"PUT"
> },
> {
> "from":"*",
> "to":"*"
> }
> ]
> Problem:
> The requests work as expected for some unknown period, then begin to respond
> with a 400 status and the "Exceeded rewrite recursion limit" error message.
> Changing the rewrites rules for both applications, including setting them to
> empty arrays, had no effect.
> The problem was solved by restarting the CouchDB service.
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