# Inconsistency in data stream rollover
**URL:** https://discuss.elastic.co/t/inconsistency-in-data-stream-rollover/323883
**Category:** Elasticsearch
**Tags:** docker, ilm-index-lifecycle-management, datastreams
**Created:** [January 25, 2023, 6:20am UTC](https://discuss.elastic.co/t/inconsistency-in-data-stream-rollover/323883 "2023-01-25T06:20:36Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@sagarkhatri0605](https://discuss.elastic.co/u/sagarkhatri0605)
#### Post date: [January 25, 2023, 6:20am UTC](https://discuss.elastic.co/t/inconsistency-in-data-stream-rollover/323883/1 "2023-01-25T06:20:36Z")
We want hourly rollover of the index and then index should get deleted after 12 hour.
To achieve this we have created data stream with a ILM policy which rollover index every 1hr and then the index goes into the warm phase and after 12 hour index goes into deleted phase.
Setup:
- Elasticsearch 8.6 docker on ubuntu 22.4
- We have setup a test cron job which push data to the index in every 5th min.
- Below are the scripts for the ILM policy and index template
```
PUT _ilm/policy/ilm_test_activities2
{
"policy": {
"phases": {
"hot": {
"min_age": "0s",
"actions": {
"set_priority": {
"priority": 100
},
"rollover": {
"max_age": "1h"
},
}
},
"warm": {
"min_age": "0s",
"actions": {
"set_priority": {
"priority": 50
}
}
},
"delete": {
"min_age": "12h",
"actions": {
"delete": {}
}
}
}
}
}
PUT /_index_template/it_test_activities2
{
"index_patterns" : ["test-activity2-*"],
"priority" : 1,
"data_stream": { },
"template": {
"settings" : {
"index" : {
"lifecycle" : {
"name" : "ilm_test_activities2"
},
"default_pipeline": "ip_timestamp",
"number_of_replicas": 0
}
}
}
}
```
Expected behaviour for index rollover:
-Every hour new index should get created.
Current behaviour:
Index is not getting rollover every hour.
Test result:
- First index created at: 07:45
- Second index rollover : 08:51 // after 1 hr 06 mins
- Third index rolleover : 10:01 // after 1 hr 10 mins
- Fourth index rolleover: 11:11 // after 1 hr 10 mins
- Fifth index rolleover : 13:01 // after 1 hr 50 mins
- sixth index rolleover : 14:31 // after 1 hr 30 mins
We have observed more time gap(upto 3-5 hr) in the index rollover.
Is there any misconfiguration from our end?
Data stream information:
```auto
{
".ds-test_ilm_index-2023.01.20-000001": {
"aliases": {},
"mappings": {
"_data_stream_timestamp": {
"enabled": true
},
"properties": {
"@timestamp": {
"type": "date"
},
"test": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
},
"settings": {
"index": {
"lifecycle": {
"name": "ilm_test_activities",
"indexing_complete": "true"
},
"routing": {
"allocation": {
"include": {
"_tier_preference": "data_warm,data_hot"
}
}
},
"hidden": "true",
"number_of_shards": "1",
"provided_name": ".ds-test_ilm_index-2023.01.20-000001",
"default_pipeline": "ip_timestamp",
"creation_date": "1674200701723",
"priority": "50",
"number_of_replicas": "0",
"uuid": "Glg3Wb_cThWRVexefxq1QA",
"version": {
"created": "8050399"
}
}
},
"data_stream": "test_ilm_index"
},
".ds-test_ilm_index-2023.01.20-000002": {
"aliases": {},
"mappings": {
"_data_stream_timestamp": {
"enabled": true
},
"properties": {
"@timestamp": {
"type": "date"
},
"test": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
},
"settings": {
"index": {
"lifecycle": {
"name": "ilm_test_activities",
"indexing_complete": "true"
},
"routing": {
"allocation": {
"include": {
"_tier_preference": "data_warm,data_hot"
}
}
},
"hidden": "true",
"number_of_shards": "1",
"provided_name": ".ds-test_ilm_index-2023.01.20-000002",
"default_pipeline": "ip_timestamp",
"creation_date": "1674204674509",
"priority": "50",
"number_of_replicas": "0",
"uuid": "WdCkeUBMQFW1jJNaZBiutg",
"version": {
"created": "8050399"
}
}
},
"data_stream": "test_ilm_index"
},
".ds-test_ilm_index-2023.01.20-000003": {
"aliases": {},
"mappings": {
"_data_stream_timestamp": {
"enabled": true
},
"properties": {
"@timestamp": {
"type": "date"
},
"test": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
},
"settings": {
"index": {
"lifecycle": {
"name": "ilm_test_activities",
"indexing_complete": "true"
},
"routing": {
"allocation": {
"include": {
"_tier_preference": "data_warm,data_hot"
}
}
},
"hidden": "true",
"number_of_shards": "1",
"provided_name": ".ds-test_ilm_index-2023.01.20-000003",
"default_pipeline": "ip_timestamp",
"creation_date": "1674208874425",
"priority": "50",
"number_of_replicas": "0",
"uuid": "REzMYu_oQLyGNk805Wwnyg",
"version": {
"created": "8050399"
}
}
},
"data_stream": "test_ilm_index"
},
".ds-test_ilm_index-2023.01.20-000004": {
"aliases": {},
"mappings": {
"_data_stream_timestamp": {
"enabled": true
},
"properties": {
"@timestamp": {
"type": "date"
},
"test": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
},
"settings": {
"index": {
"lifecycle": {
"name": "ilm_test_activities",
"indexing_complete": "true"
},
"routing": {
"allocation": {
"include": {
"_tier_preference": "data_warm,data_hot"
}
}
},
"hidden": "true",
"number_of_shards": "1",
"provided_name": ".ds-test_ilm_index-2023.01.20-000004",
"default_pipeline": "ip_timestamp",
"creation_date": "1674213077692",
"priority": "50",
"number_of_replicas": "0",
"uuid": "GQY2-a2kS3aPkrdWV3vsdw",
"version": {
"created": "8050399"
}
}
},
"data_stream": "test_ilm_index"
},
".ds-test_ilm_index-2023.01.20-000005": {
"aliases": {},
"mappings": {
"_data_stream_timestamp": {
"enabled": true
},
"properties": {
"@timestamp": {
"type": "date"
},
"test": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
},
"settings": {
"index": {
"lifecycle": {
"name": "ilm_test_activities",
"indexing_complete": "true"
},
"routing": {
"allocation": {
"include": {
"_tier_preference": "data_warm,data_hot"
}
}
},
"hidden": "true",
"number_of_shards": "1",
"provided_name": ".ds-test_ilm_index-2023.01.20-000005",
"default_pipeline": "ip_timestamp",
"creation_date": "1674219681199",
"priority": "50",
"number_of_replicas": "0",
"uuid": "DH_O-JDASNyz94nRtj-e7A",
"version": {
"created": "8050399"
}
}
},
"data_stream": "test_ilm_index"
},
".ds-test_ilm_index-2023.01.20-000006": {
"aliases": {},
"mappings": {
"_data_stream_timestamp": {
"enabled": true
},
"properties": {
"@timestamp": {
"type": "date"
},
"test": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
},
"settings": {
"index": {
"lifecycle": {
"name": "ilm_test_activities"
},
"routing": {
"allocation": {
"include": {
"_tier_preference": "data_hot"
}
}
},
"hidden": "true",
"number_of_shards": "1",
"provided_name": ".ds-test_ilm_index-2023.01.20-000006",
"default_pipeline": "ip_timestamp",
"creation_date": "1674225077571",
"priority": "100",
"number_of_replicas": "0",
"uuid": "ndl6TE29TKO3H6lEfM6Rrw",
"version": {
"created": "8050399"
}
}
},
"data_stream": "test_ilm_index"
}
}
```
---
### Author:  [@sagarkhatri0605](https://discuss.elastic.co/u/sagarkhatri0605)
#### Post date: [January 27, 2023, 6:32am UTC](https://discuss.elastic.co/t/inconsistency-in-data-stream-rollover/323883/2 "2023-01-27T06:32:33Z")
We have updated the test environment:
We have added a cluster level ilm setting to allow index rollover with 0 documents.
indices.lifecycle.rollover.only\_if\_has\_documents= false
And stopped the cron job pushing data every 5 minutes
The Datastream is now rolling index with expected behaviour.
What could be the reason behind this? what could be the issue?
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 24, 2023, 6:32am UTC](https://discuss.elastic.co/t/inconsistency-in-data-stream-rollover/323883/3 "2023-02-24T06:32:38Z")
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