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61 lines
2.4 KiB
61 lines
2.4 KiB
Adjust the reaction to a polling interval timestamp that references
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to a past time.
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Past timestamps can happen when ntpd adjusts router's time after network
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connectivity is obtained after boot. Collectd shows warnings for each plugin
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as it tries to enter new values with the same timestamp as the previous one.
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This patch adjusts the next polling time to be now+2 seconds for the main
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loop and for the plugin-specific read loops. That avoids the warnings, but
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does not overreact in case there are shorter polling intervals or the time
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gets adjusted for other reasons.
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Additionally some debug statements are added, but they are visible only
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when --enable-debug configure option is used in Makefile.
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--- a/src/daemon/collectd.c
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+++ b/src/daemon/collectd.c
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@@ -274,20 +274,23 @@ static int do_loop(void) {
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update_kstat();
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#endif
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+ DEBUG("do_loop before plugin_read_all: now = %.3f", CDTIME_T_TO_DOUBLE(cdtime()));
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/* Issue all plugins */
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plugin_read_all();
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cdtime_t now = cdtime();
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+ DEBUG("do_loop after plugin_read_all: now = %.3f, wait_until= %.3f", CDTIME_T_TO_DOUBLE(now), CDTIME_T_TO_DOUBLE(wait_until));
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if (now >= wait_until) {
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- WARNING("Not sleeping because the next interval is "
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+ WARNING("Sleeping only 2s because the next interval is "
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"%.3f seconds in the past!",
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CDTIME_T_TO_DOUBLE(now - wait_until));
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- wait_until = now + interval;
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- continue;
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+ wait_until = now + DOUBLE_TO_CDTIME_T(2);
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+ DEBUG("do_loop: wait_until adjusted to now+2 = %.3f", CDTIME_T_TO_DOUBLE(wait_until));
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}
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struct timespec ts_wait = CDTIME_T_TO_TIMESPEC(wait_until - now);
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wait_until = wait_until + interval;
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+ DEBUG("do_loop ends: wait_until set to %.3f", CDTIME_T_TO_DOUBLE(wait_until));
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while ((loop == 0) && (nanosleep(&ts_wait, &ts_wait) != 0)) {
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if (errno != EINTR) {
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--- a/src/daemon/plugin.c
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+++ a/src/daemon/plugin.c
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@@ -578,10 +578,11 @@
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/* Check, if `rf_next_read' is in the past. */
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if (rf->rf_next_read < now) {
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- /* `rf_next_read' is in the past. Insert `now'
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+ /* `rf_next_read' is in the past. Insert `now'+2s
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* so this value doesn't trail off into the
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* past too much. */
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- rf->rf_next_read = now;
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+ rf->rf_next_read = now + DOUBLE_TO_CDTIME_T(2);
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+ DEBUG("plugin_read_thread: Next read is in the past. Adjusted to now+2s");
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}
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DEBUG("plugin_read_thread: Next read of the `%s' plugin at %.3f.",
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