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Heuristics are set of commands executed locally on startup, cluster membership change, successful connect to corosync-qnetd and optionally also at regular times. When all commands finish successfully (their return error code is zero) on time, heuristics have passed, otherwise they have failed. The heuristics result is sent to corosync-qnetd and there it's used in calculations to determine which partition should be quorate. Right know, there are some problems (bugs): - Regular heuristics is supported only by ffsplit. This is not a problem for clusters with power fencing, but deployments where non-quorate partition continues to operate may see this as a problem. - Qdevice-tool status doesn't contain detailed information about heuristics. - Qdevice-tool doesn't have a possibility to trigger heuristics re-execute. Thanks Chrissie Caulfield for Englishify the man pages. Signed-off-by: Jan Friesse <jfriesse@redhat.com> Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
/*
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* Copyright (c) 2015-2016 Red Hat, Inc.
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*
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* All rights reserved.
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*
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* Author: Jan Friesse (jfriesse@redhat.com)
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*
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* This software licensed under BSD license, the text of which follows:
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of the Red Hat, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _UTILS_H_
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#define _UTILS_H_
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#include <sys/types.h>
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#include <inttypes.h>
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#define UTILS_PRI_NODE_ID "%" PRIu32
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#define UTILS_PRI_DATACENTER_ID "%" PRIu32
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/*
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#define UTILS_PRI_NODE_ID "0x%" PRIx32
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#define UTILS_PRI_DATACENTER_ID "0x%" PRIx32
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*/
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#define UTILS_PRI_MSG_SEQ "%" PRIu32
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#define UTILS_PRI_RING_ID "%" PRIx32 ".%" PRIx64
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#define UTILS_PRI_CONFIG_VERSION "%" PRIu64
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#define UTILS_PRI_EXPECTED_VOTES "%" PRIu32
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern int utils_parse_bool_str(const char *str);
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extern int utils_flock(const char *lockfile, pid_t pid,
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int *another_instance_running);
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extern void utils_tty_detach(void);
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extern int utils_fd_set_non_blocking(int fd);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _UTILS_H_ */
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