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From "Pasi Eronen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (COUCHDB-1100) Server doesn't release HTTP connection when client queries a currently updating view and times out
Date Fri, 25 Mar 2011 08:58:05 GMT
Server doesn't release HTTP connection when client queries a currently updating view and times
out
--------------------------------------------------------------------------------------------------

                 Key: COUCHDB-1100
                 URL: https://issues.apache.org/jira/browse/COUCHDB-1100
             Project: CouchDB
          Issue Type: Bug
    Affects Versions: 1.0.2
            Reporter: Pasi Eronen


If a client queries a view that is currently updating (without stale=ok), and then closes
the connection after a timeout, the resources on the server side are not released (until the
view update completes).

If the view update takes a long time, the server will eventually run out of file descriptors
(or if the file descriptor limit is very large, runs out of something else; not quite sure
what).

Steps to reproduce the problem:

1) set "ulimit -n" for couchdb to 1024 (often the default). Using a much larger limit seems
to result in different behavior (possibly CouchDB runs out of some other resource before file
descriptors; not sure what).

2) create a database with a view and sufficient number of docs so that generating the view
from scratch takes a lot of time

3) query the view repeatedly with a short timeout: for example in bash:
while true; do curl -m1 'http://127.0.0.1:5984/grande/_design/testviews/_view/byDate1?limit=1';
done

4) monitor the number of sockets used with e.g. "netstat -an | grep 5984 | grep CLOSE_WAIT".
This should increase all the time.

5) roughly when the number hits 1K, couchdb stops responding completely, and there's large
number of error messages written to the log file.





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