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Cache: proper wakeup of subrequests. In case of a cache lock timeout and in the aio handler we now call r->write_event_handler() instead of a connection write handler, to make sure to run appropriate subrequest. Previous code failed to run inactive subrequests and hence resulted in suboptimal behaviour, see report by Yichun Zhang: http://mailman.nginx.org/pipermail/nginx-devel/2013-October/004435.html (Infinite hang claimed in the report seems impossible without 3rd party modules, as subrequests will be eventually woken up by the postpone filter.)
author Maxim Dounin <mdounin@mdounin.ru>
date Tue, 02 Dec 2014 05:54:56 +0300
parents 64af0f7c4dcd
children e0920ea61632
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/* 
 * Copyright (C) 2002-2014 Igor Sysoev
 * Copyright (C) 2011-2014 Nginx, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */