druid/Rule-Configuration.md at ea95566cd94a66769b0df6ffcbb9f6521ee9fe9e

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Note: It is recommended that the coordinator console is used to configure rules. However, the coordinator node does have HTTP endpoints to programmatically configure rules.

Load Rules

Load rules indicate how many replicants of a segment should exist in a server tier.

Interval Load Rule

Interval load rules are of the form:

{
  "type" : "loadByInterval",
  "interval" : "2012-01-01/2013-01-01",
  "tier" : "hot"
}

type - this should always be "loadByInterval"
interval - A JSON Object representing ISO-8601 Intervals
tier - the configured historical node tier

Period Load Rule

Period load rules are of the form:

{
  "type" : "loadByPeriod",
  "period" : "P1M",
  "tier" : "hot"
}

type - this should always be "loadByPeriod"
period - A JSON Object representing ISO-8601 Periods
tier - the configured historical node tier

The interval of a segment will be compared against the specified period. The rule matches if the period overlaps the interval.

Drop Rules

Drop rules indicate when segments should be dropped from the cluster.

Interval Drop Rule

Interval drop rules are of the form:

{
  "type" : "dropByInterval",
  "interval" : "2012-01-01/2013-01-01"
}

type - this should always be "dropByInterval"
interval - A JSON Object representing ISO-8601 Periods

A segment is dropped if the interval contains the interval of the segment.

Period Drop Rule

Period drop rules are of the form:

{
  "type" : "dropByPeriod",
  "period" : "P1M"
}

type - this should always be "dropByPeriod"
period - A JSON Object representing ISO-8601 Periods

The interval of a segment will be compared against the specified period. The period is from some time in the past to the current time. The rule matches if the period contains the interval.

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