# Content\_tier

**URL:** <https://discuss.elastic.co/t/content-tier/256513>\
**Category:** Elasticsearch\
**Tags:** ilm-index-lifecycle-management\
**Created:** [November 24, 2020, 1:13pm UTC](https://discuss.elastic.co/t/content-tier/256513 "2020-11-24T13:13:36Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![mutt13y](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mutt13y/32/74962_2.png) [@mutt13y](https://discuss.elastic.co/u/mutt13y)\
**Post date:** [November 24, 2020, 1:13pm UTC](https://discuss.elastic.co/t/content-tier/256513/1 "2020-11-24T13:13:36Z")

</div>

Hello, with reference to 7.10 and [Data tiers | Elasticsearch Guide [master] | Elastic](https://www.elastic.co/guide/en/elasticsearch/reference/master/data-tiers.html)

> Content tier nodes are usually optimized for query performance—​they prioritize processing power over IO throughput so they can process complex searches and aggregations and return results quickly. While they are also responsible for indexing, content data is generally not ingested at as high a rate as time series data such as logs and metrics. From a resiliency perspective the indices in this tier should be configured to use one or more replicas.

and

> When you create an index, by default Elasticsearch sets [`index.routing.allocation.include._tier_preference`](https://www.elastic.co/guide/en/elasticsearch/reference/master/data-tier-shard-filtering.html#tier-preference-allocation-filter) to `data_content` to automatically allocate the index shards to the content tier.

So I do not have "content\_tier" applied to my cold nodes  
however ILM is failing to allocate shards to the cold nodes because all indecies have the tier\_preference to content.

Not sure what is the right way to fix this. I want all new data to go to hot these have  
`node.roles: ["ingest", "data_hot", "data_content"]`

cold nodes have  
`node.roles["data_cold"]`

The instructions seem to imply that cold nodes both should not have data\_content and must have data\_content.

Regards  
Stuart

---

<div class="post-metadata">

**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [November 25, 2020, 2:03am UTC](https://discuss.elastic.co/t/content-tier/256513/2 "2020-11-25T02:03:25Z")

</div>

Can you share your policy and Elasticsearch settings?

---

<div class="post-metadata">

**Author:** ![mutt13y](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mutt13y/32/74962_2.png) [@mutt13y](https://discuss.elastic.co/u/mutt13y)\
**Post date:** [November 25, 2020, 7:49am UTC](https://discuss.elastic.co/t/content-tier/256513/3 "2020-11-25T07:49:47Z")

</div>

Not sure what you mean by policy but  
one of the index in question is currently like this

```
{
  "chef-dev_cert-2020.11.19" : {
    "settings" : {
      "index" : {
        "lifecycle" : {
          "name" : "7_Days"
        },
        "routing" : {
          "allocation" : {
            "include" : {
              "_tier_preference" : "data_content"
            },
            "require" : {
              "class" : "cold"
            }
          }
        },
        "number_of_shards" : "1",
        "provided_name" : "chef-dev_cert-2020.11.19",
        "creation_date" : "1605758083756",
        "unassigned" : {
          "node_left" : {
            "delayed_timeout" : "35m"
          }
        },
        "number_of_replicas" : "1",
        "uuid" : "fhB_yQ8NRxiViiKBANeEgg",
        "version" : {
          "created" : "7100099"
        }
      }
    }
  }
}

```

The initial template is this

```
{
  "index_templates" : [
    {
      "name" : "chef",
      "index_template" : {
        "index_patterns" : [
          "chef-*"
        ],
        "template" : {
          "settings" : {
            "index" : {
              "lifecycle" : {
                "name" : "7_Days"
              },
              "routing" : {
                "allocation" : {
                  "require" : {
                    "class" : "hot"
                  }
                }
              }
            }
          }
        },
        "composed_of" : [],
        "priority" : 100
      }
    }
  ]
}

```

7\_days ILM is like this

```
{
  "7_Days" : {
    "version" : 14,
    "modified_date" : "2020-11-13T21:24:18.048Z",
    "policy" : {
      "phases" : {
        "warm" : {
          "min_age" : "2d",
          "actions" : {
            "allocate" : {
              "number_of_replicas" : 1,
              "include" : { },
              "exclude" : { },
              "require" : {
                "class" : "hot"
              }
            },
            "set_priority" : {
              "priority" : null
            }
          }
        },
        "cold" : {
          "min_age" : "5d",
          "actions" : {
            "allocate" : {
              "include" : { },
              "exclude" : { },
              "require" : {
                "class" : "cold"
              }
            },
            "set_priority" : {
              "priority" : null
            }
          }
        },
        "hot" : {
          "min_age" : "0ms",
          "actions" : {
            "set_priority" : {
              "priority" : 50
            }
          }
        },
        "delete" : {
          "min_age" : "6d",
          "actions" : {
            "delete" : {
              "delete_searchable_snapshot" : true
            }
          }
        }
      }
    }
  }
}

```

The error is

```
  "can_allocate" : "no",
  "allocate_explanation" : "cannot allocate because allocation is not permitted to any of the nodes",
  "node_allocation_decisions" : [
    {
      "node_id" : "XXXXX",
      "node_name" : "XXXX",
      "transport_address" : "XXXXX",
      "node_attributes" : {
        "datacenter" : "XXXX",
        "xpack.installed" : "true",
        "class" : "cold",
        "transform.node" : "false"
      },
      "node_decision" : "no",
      "deciders" : [
        {
          "decider" : "data_tier",
          "decision" : "NO",
          "explanation" : "index has a preference for tiers [data_content] and node does not meet the required [data_content] tier"
        }
      ]
    },

```

Stuart

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 23, 2020, 7:49am UTC](https://discuss.elastic.co/t/content-tier/256513/4 "2020-12-23T07:49:57Z")

</div>

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