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From "Mark Hammond (JIRA)" <j...@apache.org>
Subject [jira] Created: (COUCHDB-326) Occasional {"error":"error","reason":"eacces"} errors deleting a database on Windows
Date Sat, 18 Apr 2009 05:59:14 GMT
Occasional {"error":"error","reason":"eacces"} errors deleting a database on Windows
------------------------------------------------------------------------------------

                 Key: COUCHDB-326
                 URL: https://issues.apache.org/jira/browse/COUCHDB-326
             Project: CouchDB
          Issue Type: Bug
    Affects Versions: 0.9
         Environment: Windows, couch 0.9, erlang R12B 5.6.5
            Reporter: Mark Hammond


On Windows, occasionally you will see errors attempting to delete a database.   This manifests
itself by 10-30% of the test suite failing on Windows.  If you retry the tests that failed,
they will usually pass on subsequent attempts.  Running the tests individually causes them
to fail roughly 10% of the time.

 The log output shown is:

  [debug] [<0.18650.6>] httpd 500 error response:
   {"error":"error","reason":"eacces"}

  [info] [<0.18650.6>] 127.0.0.1 - - 'DELETE' /test_suite_db/ 500

A slightly snipped transcript from IRC:

(2:58:32 PM) markh: I see a number of INFO logs "Shutting down view group server, monitored
db is closing." directly before the error.  I was guessing the file may be unlink'd before
one of those workers actually closes its handle?
(2:58:54 PM) alisdair: yeah, it's probably a race condition
(2:59:13 PM) alisdair: where the delete is tried before the fd is let go
(2:59:26 PM) alisdair: the reader fd that is
(2:59:32 PM) markh: yeah
...
(3:11:47 PM) alisdair: i can't find an obvious deadlock
(3:12:18 PM) alisdair: couch_server:delete explicitly waits for the db process to exit
(3:12:23 PM) alisdair: before deleting it
(3:15:15 PM) alisdair: i think i found the problem
(3:15:23 PM) alisdair: but i need a windows machine to confirm
(3:15:30 PM) alisdair: i'll look into it tomorrow


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