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https://issues.apache.org/jira/browse/COUCHDB-1425?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13217919#comment-13217919
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Jim Klo commented on COUCHDB-1425:
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I actually went back and set my timeout pretty high (90 sec). And yes it just 
times out. 

The python script doesn't fail. That's what's odd. I don't know enough about 
surrogate pairs, but it would seem even if they are being used wrong, they are 
wrong on insert too. Hence I'd expect an error or problem on insert AND 
index/retrieval. 

No actual error is logged other than timeout. The real problem is that if the 
data is poorly formatted, and emitting the data as a key in JS causes the view 
server to stall and prevent docs of higher local sequence to not get indexed. 

It's certainly a great way to DOS an App since CouchDB doesn't balk at 
inserting it. 
                
> Emitting UTF-8 chars >= 0xD800 in JS map stops design doc from indexing
> -----------------------------------------------------------------------
>
>                 Key: COUCHDB-1425
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1425
>             Project: CouchDB
>          Issue Type: Bug
>          Components: JavaScript View Server
>    Affects Versions: 1.1.1
>         Environment: Mac OS 10.6.8, but not sure that matters.
>            Reporter: Jim Klo
>
> Was trying determine UTF-8 Char collation, using the following Gist: 
> https://gist.github.com/1904807
> It turns out that once the view gets to the document that would emit 
> "\uD800", the view server times out and stops indexing that design document.
> This seems like a bug, since I can 'store' a document with UTF-8 chars >= 
> 0xD800, but one cannot emit a key with that char in the string.

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