Ports Used by FTS

The following table lists the FTS port details:

Table 1. FTS Ports
Port name	Default port number (un / encrypted)	Description	Node-to-node	Client-to-node	XDCR (cluster-to-cluster)
`fts_http_port` / `fts_ssl_port`	8094 / 18094	Search Service REST/HTTP traffic	No	Yes	No
`fts_grpc_port` / `fts_grpc_ssl_port`	9130 / 19130	Search Service gRPC port used for scatter-gather operations between FTS nodes	Yes	No	No

Partial and Full Results

The search service reserves the capability of delivering partial results when some of the nodes in the Couchbase system are unreachable. The search request provides an option for a user who wishes to obtain either the complete result set or none at all.

Every search returns the number of partition indexes that succeeded, along with the search hits from those indexes. This information is merged and sorted into a single result-set, either partial or full, providing a fault tolerance mechanism.

Full Results

If the query successfully executes for the given attributes, the developer can use the full result option to display the complete result of the query, including all response objects.

Example

{
  "status":{"total":1,"failed":0,"successful":1},
  "request":{
    "query":{"query":"+name:air* +country:france"},"size":10,"from":0,"highlight":null,"fields":null,"facets":null,"explain":false,"sort":["-_score"],"includeLocations":false,"search_after":null,"search_before":null
  },
  "hits":[
    {"index":"DemoIndex_580e3ee6ba3ac900_4c1c5584","id":"hotel_19199","score":3.166810600229102,"sort":["_score"],"fields":{"_$c":"hotel"}}
  ],
  "total_hits":1,"max_score":3.166810600229102,"took":593704,"facets":null
}

Partial Results

Suppose some of the partition indexes fail to respond before the timeout, or respond with an error. In that case, the developers can use the partial result option to display the result for partial execution of the query.

Example

"error":"rest_index: Query, indexName: DemoIndex, err: context deadline exceeded","request":{"ctl":{"timeout":2},"from":10,"query":{"field":"country","wildcard":"f*ce"},"size":10},"status":"fail"}