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https://issues.apache.org/jira/browse/COUCHDB-2431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14194852#comment-14194852
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Alexander Shorin commented on COUCHDB-2431:
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Oh, how I feel you!

> Improve debugging and error messages of query server communication
> ------------------------------------------------------------------
>
>                 Key: COUCHDB-2431
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-2431
>             Project: CouchDB
>          Issue Type: Improvement
>      Security Level: public(Regular issues) 
>            Reporter: Martin Monperrus
>
> I end an intense debugging session of Couchdb. The problem lied in the query 
> server.
> The difficulty of debugging the query server communication comes from the 
> fact that the Couchdb log always contains the same error: "os_process_error, 
> OS process timed out." regardless of the actual error. 
> The same error message is used for very different errors:
> - query server executable not found
> - query server executable not executable (wrong permissions)
> - query server crashes at startup
> - query server hangs
> - query server replies garbage
> - query invalid
> - query execution too long



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