# Elastic Shards are Not Balanced Across Nodes
**URL:** https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504
**Category:** Elasticsearch
**Created:** [May 15, 2024, 5:30am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504 "2024-05-15T05:30:35Z")
**Posts on this page:** 11
**Page:** 1
### Author:  [@Debasis\_Mallick](https://discuss.elastic.co/u/Debasis_Mallick)
#### Post date: [May 15, 2024, 5:30am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504/1 "2024-05-15T05:30:35Z")
Hi Team,
Initially we had made a cluster of two nodes having six shards. Later we decided to add one more node to cluster, after adding node we can see that the cluster is in green state but the shards are not distributed uniformly across nodes [node1(3 shard),node2(2 shard),node3(1 shard)].
Could you please let us know if it fine or do we need to perform anything.
As per my knowledge shards should uniformly distributed. Please correct me if I am wrong.
Thanks,
Debasis
---
### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [May 15, 2024, 5:32am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504/2 "2024-05-15T05:32:58Z")
What version of Elasticsearch are you running?
What is the full output of the [cat shards API](https://www.elastic.co/guide/en/elasticsearch/reference/8.13/cat-shards.html)?
What is the full output of the [cluster stats API](https://www.elastic.co/guide/en/elasticsearch/reference/8.13/cluster-stats.html)?
---
### Author:  [@Debasis\_Mallick](https://discuss.elastic.co/u/Debasis_Mallick)
#### Post date: [May 15, 2024, 5:59am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504/3 "2024-05-15T05:59:54Z")
@Christian_Dahlqvist Thanks for response. We are using Elastic 8.9.2.
Please find cluster stats as below.
> GET /\_cluster/stats
```auto
{
"_nodes": {
"total": 3,
"successful": 3,
"failed": 0
},
"cluster_name": "elasticdemo",
"cluster_uuid": "Fjxj0fPmTpGywf8TNPQTsg",
"timestamp": 1715752440054,
"status": "green",
"indices": {
"count": 59,
"shards": {
"total": 137,
"primaries": 82,
"replication": 0.6707317073170732,
"index": {
"shards": {
"min": 2,
"max": 6,
"avg": 2.3220338983050848
},
"primaries": {
"min": 1,
"max": 6,
"avg": 1.3898305084745763
},
"replication": {
"min": 0,
"max": 2,
"avg": 0.9322033898305084
}
}
},
"docs": {
"count": 1467348256,
"deleted": 259081764
},
"store": {
"size_in_bytes": 1398000668508,
"total_data_set_size_in_bytes": 1398000668508,
"reserved_in_bytes": 0
},
"fielddata": {
"memory_size_in_bytes": 59560,
"evictions": 0,
"global_ordinals": {
"build_time_in_millis": 5563
}
},
"query_cache": {
"memory_size_in_bytes": 76334782,
"total_count": 3049674,
"hit_count": 2929874,
"miss_count": 119800,
"cache_size": 1006,
"cache_count": 1419,
"evictions": 413
},
"completion": {
"size_in_bytes": 0
},
"segments": {
"count": 784,
"memory_in_bytes": 0,
"terms_memory_in_bytes": 0,
"stored_fields_memory_in_bytes": 0,
"term_vectors_memory_in_bytes": 0,
"norms_memory_in_bytes": 0,
"points_memory_in_bytes": 0,
"doc_values_memory_in_bytes": 0,
"index_writer_memory_in_bytes": 4460328,
"version_map_memory_in_bytes": 68166,
"fixed_bit_set_memory_in_bytes": 4992,
"max_unsafe_auto_id_timestamp": 1715731207070,
"file_sizes": {}
},
"mappings": {
"total_field_count": 20210,
"total_deduplicated_field_count": 13678,
"total_deduplicated_mapping_size_in_bytes": 89668,
"field_types": [
{
"name": "alias",
"count": 89,
"index_count": 2,
"script_count": 0
},
{
"name": "binary",
"count": 2,
"index_count": 2,
"script_count": 0
},
{
"name": "boolean",
"count": 289,
"index_count": 30,
"script_count": 0
},
{
"name": "constant_keyword",
"count": 9,
"index_count": 3,
"script_count": 0
},
{
"name": "date",
"count": 592,
"index_count": 45,
"script_count": 0
},
{
"name": "date_range",
"count": 6,
"index_count": 6,
"script_count": 0
},
{
"name": "double",
"count": 85,
"index_count": 8,
"script_count": 0
},
{
"name": "flattened",
"count": 87,
"index_count": 7,
"script_count": 0
},
{
"name": "float",
"count": 165,
"index_count": 17,
"script_count": 0
},
{
"name": "geo_point",
"count": 33,
"index_count": 4,
"script_count": 0
},
{
"name": "half_float",
"count": 56,
"index_count": 14,
"script_count": 0
},
{
"name": "integer",
"count": 233,
"index_count": 13,
"script_count": 0
},
{
"name": "ip",
"count": 222,
"index_count": 6,
"script_count": 0
},
{
"name": "keyword",
"count": 9362,
"index_count": 45,
"script_count": 0
},
{
"name": "long",
"count": 4590,
"index_count": 40,
"script_count": 0
},
{
"name": "match_only_text",
"count": 333,
"index_count": 4,
"script_count": 0
},
{
"name": "nested",
"count": 80,
"index_count": 14,
"script_count": 0
},
{
"name": "object",
"count": 3468,
"index_count": 43,
"script_count": 0
},
{
"name": "scaled_float",
"count": 27,
"index_count": 7,
"script_count": 0
},
{
"name": "short",
"count": 203,
"index_count": 1,
"script_count": 0
},
{
"name": "text",
"count": 187,
"index_count": 24,
"script_count": 0
},
{
"name": "version",
"count": 9,
"index_count": 9,
"script_count": 0
},
{
"name": "wildcard",
"count": 83,
"index_count": 4,
"script_count": 0
}
],
"runtime_field_types": []
},
"analysis": {
"char_filter_types": [],
"tokenizer_types": [],
"filter_types": [],
"analyzer_types": [],
"built_in_char_filters": [],
"built_in_tokenizers": [],
"built_in_filters": [],
"built_in_analyzers": []
},
"versions": [
{
"version": "8.9.2",
"index_count": 59,
"primary_shard_count": 82,
"total_primary_bytes": 1396829132432
}
],
"search": {
"total": 2787771,
"queries": {
"match_phrase": 133,
"bool": 2774664,
"terms": 1137449,
"prefix": 790,
"match": 51138,
"match_phrase_prefix": 14,
"match_all": 5,
"exists": 1416622,
"range": 1200339,
"term": 1677863,
"nested": 94,
"simple_query_string": 219183,
"wildcard": 77
},
"sections": {
"highlight": 93,
"stored_fields": 180,
"runtime_mappings": 9398,
"query": 2775037,
"script_fields": 180,
"terminate_after": 323,
"_source": 24773,
"pit": 2721,
"fields": 9295,
"collapse": 10936,
"aggs": 168693
}
}
},
"nodes": {
"count": {
"total": 3,
"coordinating_only": 0,
"data": 3,
"data_cold": 3,
"data_content": 3,
"data_frozen": 3,
"data_hot": 3,
"data_warm": 3,
"index": 0,
"ingest": 3,
"master": 3,
"ml": 3,
"remote_cluster_client": 3,
"search": 0,
"transform": 3,
"voting_only": 0
},
"versions": [
"8.9.2"
],
"os": {
"available_processors": 30,
"allocated_processors": 30,
"names": [
{
"name": "Linux",
"count": 3
}
],
"pretty_names": [
{
"pretty_name": "Red Hat Enterprise Linux Server 7.6 (Maipo)",
"count": 2
},
{
"pretty_name": "Red Hat Enterprise Linux",
"count": 1
}
],
"architectures": [
{
"arch": "amd64",
"count": 3
}
],
"mem": {
"total_in_bytes": 100696489984,
"adjusted_total_in_bytes": 100696489984,
"free_in_bytes": 18603053056,
"used_in_bytes": 82093436928,
"free_percent": 18,
"used_percent": 82
}
},
"process": {
"cpu": {
"percent": 2
},
"open_file_descriptors": {
"min": 734,
"max": 846,
"avg": 794
}
},
"jvm": {
"max_uptime_in_millis": 6819164854,
"versions": [
{
"version": "20.0.2",
"vm_name": "OpenJDK 64-Bit Server VM",
"vm_version": "20.0.2+9-78",
"vm_vendor": "Oracle Corporation",
"bundled_jdk": true,
"using_bundled_jdk": true,
"count": 3
}
],
"mem": {
"heap_used_in_bytes": 10799082224,
"heap_max_in_bytes": 21147680768
},
"threads": 337
},
"fs": {
"total_in_bytes": 2049917026304,
"free_in_bytes": 651357851648,
"available_in_bytes": 560368238592
},
"plugins": [],
"network_types": {
"transport_types": {
"security4": 3
},
"http_types": {
"security4": 3
}
},
"discovery_types": {
"multi-node": 3
},
"packaging_types": [
{
"flavor": "default",
"type": "rpm",
"count": 3
}
],
"ingest": {
"number_of_pipelines": 35,
"processor_stats": {
"append": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"convert": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"csv": {
"count": 30,
"failed": 0,
"current": 0,
"time_in_millis": 68
},
"date": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"dot_expander": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"drop": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"fingerprint": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"foreach": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"geoip": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"grok": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"join": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"json": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"pipeline": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"remove": {
"count": 9,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"rename": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"script": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"set": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"set_security_user": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"split": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"uri_parts": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
},
"user_agent": {
"count": 0,
"failed": 0,
"current": 0,
"time_in_millis": 0
}
}
},
"indexing_pressure": {
"memory": {
"current": {
"combined_coordinating_and_primary_in_bytes": 0,
"coordinating_in_bytes": 0,
"primary_in_bytes": 0,
"replica_in_bytes": 0,
"all_in_bytes": 0
},
"total": {
"combined_coordinating_and_primary_in_bytes": 0,
"coordinating_in_bytes": 0,
"primary_in_bytes": 0,
"replica_in_bytes": 0,
"all_in_bytes": 0,
"coordinating_rejections": 0,
"primary_rejections": 0,
"replica_rejections": 0
},
"limit_in_bytes": 0
}
}
},
"snapshots": {
"current_counts": {
"snapshots": 0,
"shard_snapshots": 0,
"snapshot_deletions": 0,
"concurrent_operations": 0,
"cleanups": 0
},
"repositories": {}
}
}
```
Please shards details.
> GET /\_cat/shards
```auto
.security-profile-8 0 p STARTED 1 8.5kb 10.10.18.174 cb-2
.security-profile-8 0 r STARTED 1 8.5kb 10.10.18.59 cb-1
.ds-.logs-deprecation.elasticsearch-default-2024.04.26-000009 0 p STARTED 1 9.5kb 10.10.18.174 cb-2
.ds-.logs-deprecation.elasticsearch-default-2024.04.26-000009 0 r STARTED 1 9.4kb 10.10.18.59 cb-1
.apm-custom-link 0 p STARTED 0 248b 10.10.18.174 cb-2
.apm-custom-link 0 r STARTED 0 248b 10.10.18.59 cb-1
.async-search 0 p STARTED 0 256b 10.10.18.174 cb-2
.async-search 0 r STARTED 0 256b 10.10.18.59 cb-1
.monitoring-beats-7-2024.05.12 0 p STARTED 10080 6.3mb 10.10.18.174 cb-2
.monitoring-beats-7-2024.05.12 0 r STARTED 10080 6.3mb 10.10.18.59 cb-1
.monitoring-es-7-2024.05.12 0 p STARTED 323340 160.2mb 10.10.18.215 cb-3
.monitoring-es-7-2024.05.12 0 r STARTED 323340 160.2mb 10.10.18.59 cb-1
.ds-ilm-history-5-2024.04.26-000008 0 p STARTED 18 22.5kb 10.10.18.174 cb-2
.ds-ilm-history-5-2024.04.26-000008 0 r STARTED 18 22.5kb 10.10.18.59 cb-1
.internal.alerts-security.alerts-default-000001 0 r STARTED 0 248b 10.10.18.174 cb-2
.internal.alerts-security.alerts-default-000001 0 p STARTED 0 248b 10.10.18.215 cb-3
.kibana_security_solution_8.9.2_001 0 p STARTED 3 37.1kb 10.10.18.174 cb-2
.kibana_security_solution_8.9.2_001 0 r STARTED 3 37.1kb 10.10.18.59 cb-1
.internal.alerts-observability.slo.alerts-default-000001 0 p STARTED 0 248b 10.10.18.174 cb-2
.internal.alerts-observability.slo.alerts-default-000001 0 r STARTED 0 248b 10.10.18.59 cb-1
.monitoring-kibana-7-2024.05.13 0 p STARTED 17280 7mb 10.10.18.174 cb-2
.monitoring-kibana-7-2024.05.13 0 r STARTED 17280 7mb 10.10.18.59 cb-1
.fleet-file-data-agent-000001 0 p STARTED 0 248b 10.10.18.215 cb-3
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.monitoring-kibana-7-2024.05.09 0 p STARTED 17278 7.1mb 10.10.18.174 cb-2
.monitoring-kibana-7-2024.05.09 0 r STARTED 17278 7.1mb 10.10.18.59 cb-1
.kibana_ingest_8.9.2_001 0 p STARTED 345 536.2kb 10.10.18.215 cb-3
.kibana_ingest_8.9.2_001 0 r STARTED 345 536.2kb 10.10.18.59 cb-1
elastictemp7 0 p STARTED 0 247b 10.10.18.215 cb-3
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elastictemp7 4 p STARTED 0 247b 10.10.18.174 cb-2
elastictemp7 5 p STARTED 0 247b 10.10.18.174 cb-2
.ds-.logs-deprecation.elasticsearch-default-2024.03.27-000008 0 p STARTED 4 34.1kb 10.10.18.174 cb-2
.ds-.logs-deprecation.elasticsearch-default-2024.03.27-000008 0 r STARTED 4 34.1kb 10.10.18.59 cb-1
.monitoring-beats-7-2024.05.10 0 r STARTED 10080 6.2mb 10.10.18.174 cb-2
.monitoring-beats-7-2024.05.10 0 p STARTED 10080 6.2mb 10.10.18.215 cb-3
.monitoring-kibana-7-2024.05.12 0 p STARTED 17278 7.1mb 10.10.18.174 cb-2
.monitoring-kibana-7-2024.05.12 0 r STARTED 17278 7.1mb 10.10.18.59 cb-1
.kibana_8.9.2_001 0 p STARTED 281 159kb 10.10.18.174 cb-2
.kibana_8.9.2_001 0 r STARTED 281 170.8kb 10.10.18.59 cb-1
.ds-.kibana-event-log-8.9.2-2024.04.11-000006 0 p STARTED 0 247b 10.10.18.174 cb-2
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.monitoring-es-7-2024.05.13 0 p STARTED 323305 158.2mb 10.10.18.215 cb-3
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emp-000008 0 p STARTED 0 247b 10.10.18.215 cb-3
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sfw230725 3 p STARTED 3 17.8kb 10.10.18.59 cb-1
.ds-filebeat-8.9.2-2023.11.28-000001 0 r STARTED 0 247b 10.10.18.174 cb-2
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.ds-.kibana-event-log-8.9.2-2024.02.26-000004 0 p STARTED 1 6.2kb 10.10.18.174 cb-2
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.internal.alerts-observability.uptime.alerts-default-000001 0 p STARTED 0 248b 10.10.18.215 cb-3
.internal.alerts-observability.uptime.alerts-default-000001 0 r STARTED 0 248b 10.10.18.59 cb-1
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.security-7 0 p STARTED 143 414.6kb 10.10.18.215 cb-3
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.monitoring-beats-7-2024.05.13 0 p STARTED 10080 6.2mb 10.10.18.215 cb-3
.monitoring-beats-7-2024.05.13 0 r STARTED 10080 6.2mb 10.10.18.59 cb-1
.ds-ilm-history-5-2024.03.27-000006 0 p STARTED 32 44kb 10.10.18.174 cb-2
.ds-ilm-history-5-2024.03.27-000006 0 r STARTED 32 44kb 10.10.18.59 cb-1
.ds-.kibana-event-log-8.9.2-2024.01.27-000003 0 p STARTED 14 84.6kb 10.10.18.215 cb-3
.ds-.kibana-event-log-8.9.2-2024.01.27-000003 0 r STARTED 14 84.6kb 10.10.18.59 cb-1
.monitoring-es-7-2024.05.10 0 p STARTED 323343 159.4mb 10.10.18.174 cb-2
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```
---
### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [May 15, 2024, 6:04am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504/4 "2024-05-15T06:04:59Z")
The total shard count is indeed a bit uneven across the nodes (56, 46 and 35). In older versions Elasticsearch used to balance only on shard count, but in more recent versions I believe this has change to also account for disk space used. Is the amount of disk space used on the nodes proportional to the number of shards they hold or more even?
---
### Author:  [@Debasis\_Mallick](https://discuss.elastic.co/u/Debasis_Mallick)
#### Post date: [May 15, 2024, 6:11am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504/5 "2024-05-15T06:11:54Z")
The third node does not have same amount of space as of other two nodes. The disk space and utilization of two nodes which are initially part of the cluster.
```auto
[root@cb-3 disk2]# df -kh /disk2/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg-lv01 817G 652G 131G 84% /disk2
```
```auto
[root@cb-2 disk2]# df -kh /disk2/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg-lv01 748G 434G 283G 61% /disk2
[root@cb-2 disk2]#
```
The below is the space allocated and utilization of new node.
```auto
[root@cb-1 disk2]# df -kh /disk2/
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg-lv01 345G 218G 110G 67% /disk2
[root@cb-1 disk2]#
```
Thanks,
Debasis
---
### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [May 15, 2024, 6:18am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504/6 "2024-05-15T06:18:19Z")
That may then explain it. Elasticsearch generally assumes that all nodes within a specific tier have the same specification with respect to RAM, CPU and storage, so it is recommended to avoid mixing nodes with different specifications as it may lead to enexpected side effects and imbalance.
---
### Author:  [@Debasis\_Mallick](https://discuss.elastic.co/u/Debasis_Mallick)
#### Post date: [May 15, 2024, 6:25am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504/7 "2024-05-15T06:25:40Z")
Thanks @Christian_Dahlqvist . Now I had two questions.
1. In node cb-3 still space is avliable and it does not reach any kind of threshold value. So why it stops moving shards.
2. Now the overall cluster status is green but shards are not uniformly distributed. So will it impact the performance while querying the Index.
Thanks,
Debasis
---
### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [May 15, 2024, 6:32am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504/8 "2024-05-15T06:32:55Z")
Node `cb-3` is at 84% and the standard first watermark is at 85% so it does make sense to not allocate more shards there.
> [@Debasis\_Mallick](#):
>
> Now the overall cluster status is green but shards are not uniformly distributed. So will it impact the performance while querying the Index.
Not necessarily, but that depends on how shards are distributed and the load on the cluster. It is quite possible that it will not be noticeable, but you are more likely to experience imbalances as the storage space is not uniform.
---
### Author:  [@Debasis\_Mallick](https://discuss.elastic.co/u/Debasis_Mallick)
#### Post date: [May 15, 2024, 6:40am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504/9 "2024-05-15T06:40:08Z")
> [@Christian\_Dahlqvist](#):
>
> Node `cb-3` is at 84%
cb-3 is already part of the cluster and after data ingested it utilized to `84%`. cb-1 is the new node which added yesterday and current utilization is `67%`. So my concern is why the shards does not moved to cb-1 node.
Thanks,
Debasis
---
### Author:  [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)
#### Post date: [May 15, 2024, 7:26am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504/10 "2024-05-15T07:26:55Z")
It does have less disk space available compared to the other nodes, so that could be affecting the new shard allocation algorithm. I do not know the internals of the new algorithm, so will need to leave that for someone else.
---
### Author:  [@pces](https://discuss.elastic.co/u/pces)
#### Post date: [May 16, 2024, 5:51am UTC](https://discuss.elastic.co/t/elastic-shards-are-not-balanced-across-nodes/359504/11 "2024-05-16T05:51:48Z")
Thanks @Christian_Dahlqvist
we know that there is enough disk space available on each node to allow even distribution of the shards. Given that, is there a way to trigger ES to rebalance? And could that have been done during the node add itself (so as to avoid 2 rounds of rebalance)?