# Shard allocation - strange behaviour of index tier preference **URL:** https://discuss.elastic.co/t/shard-allocation-strange-behaviour-of-index-tier-preference/326746 **Category:** Elasticsearch **Created:** [March 1, 2023, 9:56am UTC](https://discuss.elastic.co/t/shard-allocation-strange-behaviour-of-index-tier-preference/326746 "2023-03-01T09:56:39Z") **Posts on this page:** 1 **Showing post:** 9
### Author: ![Michael\_Hyatt](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/michael_hyatt/32/72891_2.png) [@Michael\_Hyatt](https://discuss.elastic.co/u/Michael_Hyatt) #### Post date: [March 7, 2023, 11:00pm UTC](https://discuss.elastic.co/t/shard-allocation-strange-behaviour-of-index-tier-preference/326746/9 "2023-03-07T23:00:26Z")
Can't get it to work. I created a brand new 2h/2w cluster. ```auto # Creating the index PUT test1 { "settings": { "index.routing.allocation.include._tier_preference": null, "number_of_replicas": 2 } } # GET _cat/shards/test1?v 200 OK index shard prirep state docs store ip node test1 0 p STARTED 0 225b 10.47.192.173 instance-0000000000 test1 0 r STARTED 0 225b 10.47.192.99 instance-0000000001 test1 0 r UNASSIGNED # GET _cluster/allocation/explain 200 OK { "index": "test1", "shard": 0, "primary": false, "current_state": "unassigned", "unassigned_info": { "reason": "INDEX_CREATED", "at": "2023-03-07T22:56:28.660Z", "last_allocation_status": "no_attempt" }, "can_allocate": "no", "allocate_explanation": "Elasticsearch isn't allowed to allocate this shard to any of the nodes in the cluster. Choose a node to which you expect this shard to be allocated, find this node in the node-by-node explanation, and address the reasons which prevent Elasticsearch from allocating this shard there.", "node_allocation_decisions": [ { "node_id": "79fDvTXCTr24DjmsUMsYOA", "node_name": "instance-0000000003", "transport_address": "10.47.192.117:19037", "node_attributes": { "region": "unknown-region", "instance_configuration": "gcp.data.highstorage.1", "server_name": "instance-0000000003.4f379901a9b14417a3e141d745799f8f", "data": "warm", "xpack.installed": "true", "logical_availability_zone": "zone-1", "availability_zone": "us-west2-b" }, "node_decision": "no", "weight_ranking": 1, "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" } ] }, { "node_id": "NZ2kKMF3R-WkhNF56SCJgA", "node_name": "instance-0000000002", "transport_address": "10.47.192.127:19677", "node_attributes": { "region": "unknown-region", "instance_configuration": "gcp.data.highstorage.1", "server_name": "instance-0000000002.4f379901a9b14417a3e141d745799f8f", "data": "warm", "xpack.installed": "true", "logical_availability_zone": "zone-0", "availability_zone": "us-west2-c" }, "node_decision": "no", "weight_ranking": 2, "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" } ] }, { "node_id": "ZktlgqMhQF6opcfiq9mP6g", "node_name": "instance-0000000001", "transport_address": "10.47.192.99:19787", "node_attributes": { "region": "unknown-region", "instance_configuration": "gcp.data.highio.1", "server_name": "instance-0000000001.4f379901a9b14417a3e141d745799f8f", "data": "hot", "xpack.installed": "true", "logical_availability_zone": "zone-1", "availability_zone": "us-west2-b" }, "node_decision": "no", "weight_ranking": 3, "deciders": [ { "decider": "same_shard", "decision": "NO", "explanation": "a copy of this shard is already allocated to this node [[test1][0], node[ZktlgqMhQF6opcfiq9mP6g], [R], s[STARTED], a[id=neRr7bqfTRqodGpKFEjcGw], failed_attempts[0]]" } ] }, { "node_id": "q_tYt6RFSHO5efwV-IAjsQ", "node_name": "instance-0000000000", "transport_address": "10.47.192.173:19307", "node_attributes": { "region": "unknown-region", "instance_configuration": "gcp.data.highio.1", "server_name": "instance-0000000000.4f379901a9b14417a3e141d745799f8f", "data": "hot", "xpack.installed": "true", "logical_availability_zone": "zone-0", "availability_zone": "us-west2-c" }, "node_decision": "no", "weight_ranking": 4, "deciders": [ { "decider": "same_shard", "decision": "NO", "explanation": "a copy of this shard is already allocated to this node [[test1][0], node[q_tYt6RFSHO5efwV-IAjsQ], [P], s[STARTED], a[id=HQbhwF4zTyalKa3rCQW9cA], failed_attempts[0]]" } ] } ] } # GET _cluster/allocation/explain 200 OK { "index": "test1", "shard": 0, "primary": true, "current_state": "started", "current_node": { "id": "q_tYt6RFSHO5efwV-IAjsQ", "name": "instance-0000000000", "transport_address": "10.47.192.173:19307", "attributes": { "server_name": "instance-0000000000.4f379901a9b14417a3e141d745799f8f", "instance_configuration": "gcp.data.highio.1", "region": "unknown-region", "availability_zone": "us-west2-c", "logical_availability_zone": "zone-0", "xpack.installed": "true", "data": "hot" }, "weight_ranking": 3 }, "can_remain_on_current_node": "yes", "can_rebalance_cluster": "no", "can_rebalance_cluster_decisions": [ { "decider": "rebalance_only_when_active", "decision": "NO", "explanation": "rebalancing is not allowed until all replicas in the cluster are active" }, { "decider": "cluster_rebalance", "decision": "NO", "explanation": "the cluster has unassigned shards and cluster setting [cluster.routing.allocation.allow_rebalance] is set to [indices_all_active]" } ], "can_rebalance_to_other_node": "no", "rebalance_explanation": "Elasticsearch is not allowed to allocate or rebalance this shard to another node. If you expect this shard to be rebalanced to another node, find this node in the node-by-node explanation and address the reasons which prevent Elasticsearch from rebalancing this shard there.", "node_allocation_decisions": [ { "node_id": "79fDvTXCTr24DjmsUMsYOA", "node_name": "instance-0000000003", "transport_address": "10.47.192.117:19037", "node_attributes": { "server_name": "instance-0000000003.4f379901a9b14417a3e141d745799f8f", "instance_configuration": "gcp.data.highstorage.1", "region": "unknown-region", "availability_zone": "us-west2-b", "logical_availability_zone": "zone-1", "xpack.installed": "true", "data": "warm" }, "node_decision": "no", "weight_ranking": 1, "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" } ] }, { "node_id": "NZ2kKMF3R-WkhNF56SCJgA", "node_name": "instance-0000000002", "transport_address": "10.47.192.127:19677", "node_attributes": { "server_name": "instance-0000000002.4f379901a9b14417a3e141d745799f8f", "instance_configuration": "gcp.data.highstorage.1", "region": "unknown-region", "availability_zone": "us-west2-c", "logical_availability_zone": "zone-0", "xpack.installed": "true", "data": "warm" }, "node_decision": "no", "weight_ranking": 2, "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" } ] }, { "node_id": "ZktlgqMhQF6opcfiq9mP6g", "node_name": "instance-0000000001", "transport_address": "10.47.192.99:19787", "node_attributes": { "server_name": "instance-0000000001.4f379901a9b14417a3e141d745799f8f", "instance_configuration": "gcp.data.highio.1", "region": "unknown-region", "availability_zone": "us-west2-b", "logical_availability_zone": "zone-1", "xpack.installed": "true", "data": "hot" }, "node_decision": "no", "weight_ranking": 3, "deciders": [ { "decider": "same_shard", "decision": "NO", "explanation": "a copy of this shard is already allocated to this node [[test1][0], node[ZktlgqMhQF6opcfiq9mP6g], [R], s[STARTED], a[id=neRr7bqfTRqodGpKFEjcGw], failed_attempts[0]]" } ] } ] } ``` --- _[View the full topic](https://discuss.elastic.co/t/shard-allocation-strange-behaviour-of-index-tier-preference/326746)._