Little bit confused on min_age parameter in ilm

Elastic Stack Elasticsearch
1

Greetings...!
Im currently using below ilm policy for my project. I just want to know the life span of an index. PUT _ilm/policy/hot_warm_delete
{
"policy": {
"phases": {
"hot": {
"min_age": "0ms",
"actions": {
"rollover": {
"max_size": "50gb",
"max_age": "7d"
},
"set_priority": {
"priority": 50
}
}
},
"warm": {
"min_age": "7d",
"actions": {
"set_priority": {
"priority": 25
}
}
},
"delete": {
"min_age": "7d",
"actions": {
"delete": {
"delete_searchable_snapshot": true
}
}
}
}
}
}

From my ILM policy, will my index get deleted after 7 days(as mentioned in delete phase) or 21 days(7 days in hot& 7 days in warm & 7 days in Delete).
Kindly help me here.
Thanks in advance.

2

min_ Age usually refers to the time since the index was created，
so your index will be deleted after 7 days

3

Thanks a ton casterQ. That clarifies my doubt.

4

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5

In this case, the hot phase has rollover action. So, it will be deleted 7 days after rollover. Check this reference: Tutorial: Automate rollover with ILM | Elasticsearch Guide [8.10] | Elastic

The min_age value is relative to the rollover time, not the index creation time.

1 Like
6

@gokulnath112 @casterQ

Correction.

Actually since the policy above hot phase indicates rollover all subsequent min_ages calculations are from the rollover date not creation date.

See here

All subsequent min_ages are calculated from the rollover date

For example, you might define a timeseries_policy that has two phases:

A hot phase that defines a rollover action to specify that an index rolls over when it reaches either a max_primary_shard_size of 50 gigabytes or a max_age of 30 days.
A delete phase that sets min_age to remove the index 90 days after rollover.
The min_age value is relative to the rollover time, not the index creation time.

So in your case say it takes 3 days to rollover in hot then min_age warm is 7days after that so a total of 10 days before warm.

Of course if you have enough volume to rollover in 1 day or less then the rest of the min_age will be the number of days plus the fraction of a day it took to rollover