Not well-formed JSON in changes feed filtered by view.
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Key: COUCHDB-1395
URL: https://issues.apache.org/jira/browse/COUCHDB-1395
Project: CouchDB
Issue Type: Bug
Affects Versions: 1.2, 1.3
Environment: Apache CouchDB 1.3.0a-d59cdd7-git
Apache CouchDB 1.2.0a-0d8ddc8-git
Reporter: Alexander Shorin
Priority: Critical
CouchDB returns invalid JSON response for _changes feed if filter view have
failed somehow: by code mistake, bug, os timeout etc.
Steps to reproduce:
1. Create db and fill it with some documents.
2. Create buggy view that would make view server crush for some document. For
javascript one segfault and os timeout errors are actual due to any exceptions
raised from map function is silenced. You view could be fine however for
normal usage.
3. Request changes feed and apply this buggy view as filter.
Story:
View function had never proceed design documents and mostly they are created
with that knowledge. But in changes feed they have to process every document in
database and DDocs too, so they breaks their original logic and creates
unexpectable situation. Another side of problem is about custom query servers
that could prevent view processing on first occurred exception or due dynamic
code execution nature.
Certainly, it's all about invalid view function that generates exception for
some document in some case, but should _changes feed return malformed data in
this case or just notify about problem somehow and emit valid parseable JSON?
Expected result:
Valid JSON response and some message about document processing error.
Actual result:
* About to connect() to localhost port 5984 (#0)
* Trying 127.0.0.1... connected
* Connected to localhost (127.0.0.1) port 5984 (#0)
> GET /filtered_view_bug/_changes?filter=_view&view=bug/crush_on_ddoc HTTP/1.1
> User-Agent: curl/7.21.4 (x86_64-pc-linux-gnu) libcurl/7.21.4 GnuTLS/2.10.5
> zlib/1.2.5
> Host: localhost:5984
> Accept: application/json
>
< HTTP/1.1 200 OK
< Transfer-Encoding: chunked
< Server: CouchDB/1.3.0a-d59cdd7-git (Erlang OTP/R14B04)
< ETag: "3IV66Q7INUYEHYKVWADD0CA8A"
< Date: Thu, 26 Jan 2012 19:30:23 GMT
< Content-Type: application/json
< Cache-Control: must-revalidate
<
{"results":[
{"seq":1,"id":"foo","changes":[{"rev":"1-5277061607e266deb7cc87eb63354db7"}]},
{"seq":2,"id":"bar","changes":[{"rev":"1-ced1ed0168f00311e1ee301cda904840"}]},
{"seq":3,"id":"baz","changes":[{"rev":"1-ae16db0d925a8295009ff580e226a978"}]}
* Received problem 2 in the chunky parser
* Closing connection #0
curl: (56) Received problem 2 in the chunky parser
Last chunk arrives with "HTTP/1.1 500 Internal Server Error" instead of size
value.
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