How To Solve Issues Related to Log – Re-syncing mappings with cluster state because of types

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Related Issues – selected resources on related issues  
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Troubleshooting background

To troubleshoot Elasticsearch log “Re-syncing mappings with cluster state because of types” it’s important to know common problems related to Elasticsearch concepts: cluster, mapping, metadata. See below-detailed explanations complete with common problems, examples and useful tips.

Cluster in Elasticsearch

What is it

In Elasticsearch a cluster is a collection of one or more nodes (servers / VMs). A cluster can consist of an unlimited number of nodes. The cluster provides interface for indexing and storing data and search capability across all of the data which is stored in the data nodes

Each cluster has a single master node that is elected by the master eligible nodes. In cases where the master is not available the other connected master eligible nodes elect a new master. Clusters are identified by a unique name, which defaults to “Elasticsearch”.

Metadata in Elasticsearch

What it is

Metadata is information about the data. In Elasticsearch, each document has associated metadata such as _id and _index meta fields.

Examples
  • Routing meta field:
    • _routing, a routing value that places a document in a particular shard.
  • Other meta field
    • _meta, not used by Elasticsearch but can be used to store application-specific metadata.
PUT index_01
{
  "mappings": {
    "_meta": { 
      "class": "App01::User01",
      "version": "01"
    }
  }
}

  • Identity meta fields: 
    _id , the id of the document, for example querying based on _id field
PUT index01/_doc/1
{
  "text": "Document with ID 1"
}
 
PUT index01/_doc/2
{
  "text": "Document with ID 2"
}
 
GET index01/_search
{
  "query": {
    "terms": {
      "_id": [ "1", "2" ] 
    }
  }
}


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

What Does Re Syncing Mappings With
discuss.elastic.co/t/what-does-re-syncing-mappings-with-cluster-state-for-types-on-startup-mean/5928

 

Stuck With Re Syncing Mappings With
discuss.elastic.co/t/stuck-with-re-syncing-mappings-with-cluster-state-for-types-after-upgrade-0-90-9-to-1-4-2/21713

 


Log Context

Log ”Re-syncing mappings with cluster state because of types” classname is MetaDataMappingService.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

                 }
            }

            // if a single type is not up-to-date; re-send everything
            if (updatedTypes.isEmpty() == false) {
                logger.warn("[{}] re-syncing mappings with cluster state because of types [{}]"; index; updatedTypes);
                dirty = true;
                for (DocumentMapper mapper : indexService.mapperService().docMappers(true)) {
                    builder.putMapping(new MappingMetaData(mapper));
                }
            }






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