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1d4c8d85f6
* Add timezone support to Cron objects * Add timezone support to CronnableSchedule * XContent change to support parsing and display of TimeZone fields on schedules * Case insensitive timezone parsing * Doc changes * YAML REST tests * Equals, toString and HashCode now include timezone * Additional random testing for DST transitions * Migrate Cron class to use wrapped LocalDateTime The algorithm depends on some quirks of calendar but LocalDateTime correctly ignores DST during calculations so this uses a LocalDateTime with a wrapper to emulate some of Calendar's behaviours that the Cron algorithm depends on * Additional documentation to explain discontinuity event behaviour * Remove redundant conversions from ZoneId to TimeZone following move to LocalDateTime * Add documentation warning that manual clock changes will cause unpredictable watch execution * Update docs/reference/watcher/trigger/schedule.asciidoc Co-authored-by: Lee Hinman <dakrone@users.noreply.github.com> --------- Co-authored-by: Lee Hinman <dakrone@users.noreply.github.com>
99 lines
2.7 KiB
Text
99 lines
2.7 KiB
Text
[[schedule-cron]]
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==== {watcher} cron schedule
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++++
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<titleabbrev>Cron schedule</titleabbrev>
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++++
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Defines a <<trigger-schedule, `schedule`>> using a <<api-cron-expressions, cron expression>>
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that specifiues when to execute a watch.
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TIP: While cron expressions are powerful, a regularly occurring schedule
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is easier to configure with the other schedule types.
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If you must use a cron schedule, make sure you verify it with
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<<elasticsearch-croneval, `elasticsearch-croneval`>> .
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===== Configure a cron schedule with one time
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To configure a `cron` schedule, you simply specify the cron expression as a
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string value. For example, the following snippet configures a `cron` schedule
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that triggers every day at noon:
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[source,js]
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--------------------------------------------------
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{
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...
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"trigger" : {
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"schedule" : {
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"cron" : "0 0 12 * * ?"
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}
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}
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...
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}
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--------------------------------------------------
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// NOTCONSOLE
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[[_configuring_a_multiple_times_cron_schedule]]
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===== Configure a cron schedule with multiple times
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To configure a `cron` schedule that triggers multiple times, you can
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specify an array of cron expressions. For example, the following `cron`
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schedule triggers every even minute during weekdays and every uneven
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minute during the weekend:
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[source,js]
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--------------------------------------------------
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{
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...
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"trigger" : {
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"schedule" : {
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"cron" : [
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"0 0/2 * ? * MON-FRI",
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"0 1-59/2 * ? * SAT-SUN"
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]
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}
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}
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...
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}
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--------------------------------------------------
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// NOTCONSOLE
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[[configue_cron_time-zone]]
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==== Use a different time zone for a cron schedule
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By default, cron expressions are evaluated in the UTC time zone. To use a different time zone,
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you can specify the `timezone` parameter in the schedule. For example, the following
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`cron` schedule triggers at 6:00 AM and 6:00 PM during weekends in the `America/Los_Angeles` time zone:
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[source,js]
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--------------------------------------------------
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{
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...
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"trigger" : {
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"schedule" : {
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"timezone" : "America/Los_Angeles",
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"cron" : [
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"0 6,18 * * * SAT-SUN",
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]
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}
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}
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...
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}
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--------------------------------------------------
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// NOTCONSOLE
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[[croneval]]
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===== Use croneval to validate cron expressions
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{es} provides a <<elasticsearch-croneval, `elasticsearch-croneval`>> command line tool
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in the `$ES_HOME/bin` directory that you can use to check that your cron expressions
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are valid and produce the expected results.
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To validate a cron expression, pass it in as a parameter to `elasticsearch-croneval`:
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[source,bash]
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--------------------------------------------------
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bin/elasticsearch-croneval "0 0/1 * * * ?"
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--------------------------------------------------
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