I have an ELK (Elasticsearch-Kibana) stack wherein the elasticsearch node has the default shard value of 5. Logs are pushed to it in logstash format (logstash-YYYY.MM.DD
), which - correct me if I am wrong - are indexed date-wise.
Since I cannot change the shard count of an existing index without reindexing, I want to increase the number of shards to 8 when the next index is created. I figured that the ES-API allows on-the-fly persistent changes.
How do I go about doing this?
Resolution. The primary shard count of an index can only be configured at the time of index creation and cannot be changed afterward. In order to change the sharding, you would have to create a new index with updated sharding and use _reindex API to copy all indices from existing indices to the new index.
Once you set the number of shards for an index in ElasticSearch, you cannot change them. You will need to create a new index with the desired number of shards, and depending on your use case, you may want then to transfer the data to the new index.
There is a limit to the amount of data you can store on a single node so you can increase the capacity of your cluster by adding nodes and increasing the number of indices and shards to match.
If you're using time-based index names, for example daily indices for logging, and you don't have enough data, a good way to reduce the number of shards would be to switch to a weekly or a monthly pattern. You can also group old read-only indices., by month, quarter or year.
You can use the "Template Management" features in Elasticsearch: http://www.elasticsearch.org/guide/en/elasticsearch/reference/1.x/indices-templates.html
Create a new logstash template by using:
curl -XPUT localhost:9200/_template/logstash -d '
{
"template": "logstash-*",
"settings": {
"number_of_replicas": 1,
"number_of_shards": 8,
"index.refresh_interval": "5s"
},
"mappings": {
"_default_": {
"_all": {
"enabled": true
},
"dynamic_templates": [
{
"string_fields": {
"match": "*",
"match_mapping_type": "string",
"mapping": {
"type": "string",
"index": "analyzed",
"omit_norms": true,
"fields": {
"raw": {
"type": "string",
"index": "not_analyzed",
"ignore_above": 256
}
}
}
}
}
],
"properties": {
"@version": {
"type": "string",
"index": "not_analyzed"
},
"geoip": {
"type": "object",
"dynamic": true,
"path": "full",
"properties": {
"location": {
"type": "geo_point"
}
}
}
}
}
}
}'
The next time the index that matches your pattern is created, it will be created with your new settings.
The setting is on your elasticsearch. You need to change to config file config/elasticsearch.yml
Change the index.number_of_shards: 8
. and restart elasticsearch. The new configuration will set and the new index will use the new configuration, which create 8 shard as you want.
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