SHOW FULLTEXT SERVICE METRICS

This command shows the diagnostic metrics from the JLucene service (JLucene co-process on each node) used by SingleStore's VERSION 2 full-text search system. These metrics are tracked from the instantiation of the JLucene co-process, and thus the values reflect metrics for the lifetime of the JLucene co-process on each node.

Refer to Working with Full-Text Search for related information.

Syntax

SQL

SHOW FULLTEXT SERVICE METRICS [LOCAL | FOR NODE <node_id>]

Arguments

If the LOCAL and FOR NODE clauses are not specified, the SHOW FULLTEXT SERVICE METRICS command displays metrics for all the nodes in the SingleStore Helios deployment.

These clauses modify the output as follows:

LOCAL: Display metrics for the current node.
SQL
```
SHOW FULLTEXT SERVICE METRICS LOCAL;
```
FOR NODE <node_id>: Display metrics for the node with the specified ID.
SQL
```
SHOW FULLTEXT SERVICE METRICS FOR NODE <node_id>;
```

Output Metrics

The following table lists the metrics tracked for each JLucene co-process.

Metric	Description
`connections`	Total number of accepted connections.
`requests`	Total number of requests made for all the connections.
`completed`	Total number of completed requests.
`waiting`	Total number of requests waiting for execution (data has been read, but the request has not yet begun execution).
`errors`	Total number of requests that returned an error.
`maxThreads`	Highest number of active threads in the thread pool since the instantiation of the JLucene co-process.
`maxQueue`	Highest number of requests in the thread pool queue waiting for execution since the instantiation of the JLucene co-process.
`readCount`	Total number of reads performed from the main and control sockets.
`waitDuration`	Number of milliseconds a request waits, from the first read, before execution.
`functionDuration`	Total number of milliseconds spent in the function.
`executeDuration`	Total number of milliseconds spent executing the requests.
`activeThreads`	Number of active threads executing requests.
`activeControlThreads`	Number of active threads for the control socket executing requests.

Example

The following example displays metrics for a full-text search run on a SingleStore deployment with one aggregator and one leaf node.

Note: The output is JSON formatted for readability.

SQL

SHOW FULLTEXT SERVICE METRICS \G

*** 1. row ***
Node ID: 1
Metrics: {
  "requests": 2,
  "completed": 1,
  "errors": 0,
  "readCount": 2,
  "waitDuration": 36,
  "functionDuration": 174,
  "executeDuration": 179,
  "upTime": "0:00:14",
  "connections": 2,
  "waiting": 0,
  "maxThreads": 9,
  "maxQueue": 0,
  "requestsByFunction": {
    "jlucene_metrics": {
      "requests": 2,
      "completed": 1,
      "errors": 0,
      "readCount": 2,
      "waitDuration": 36,
      "functionDuration": 174,
      "executeDuration": 179
    }
  },
  "activeThreads": 1,
  "activeControlThreads": 0,
  "indexSearcherCacheStats": {
    "requestCount": 0,
    "hitCount": 0,
    "hitRate": 1,
    "loadCount": 0,
    "missCount": 0,
    "missRate": 0,
    "evictionCount": 0,
    "indexFilesInMemorySize": 0,
    "indexFilesTempFileSize": 0
  }
}
*** 2. row ***
Node ID: 2
Metrics: {
  "requests": 16,
  "completed": 15,
  "errors": 0,
  "readCount": 18,
  "waitDuration": 89,
  "functionDuration": 7288,
  "executeDuration": 7765,
  "upTime": "0:00:48",
  "connections": 17,
  "waiting": 0,
  "maxThreads": 32,
  "maxQueue": 1,
  "requestsByFunction": {
    "jlucene_metrics": {
      "requests": 2,
      "completed": 1,
      "errors": 0,
      "readCount": 2,
      "waitDuration": 2,
      "functionDuration": 10,
      "executeDuration": 11
    },
    "jlucene_index": {
      "requests": 7,
      "completed": 7,
      "errors": 0,
      "readCount": 7,
      "waitDuration": 65,
      "functionDuration": 6452,
      "executeDuration": 6796
    },
    "jlucene_search": {
      "requests": 7,
      "completed": 7,
      "errors": 0,
      "readCount": 9,
      "waitDuration": 22,
      "functionDuration": 826,
      "executeDuration": 958
    }
  },
  "activeThreads": 1,
  "activeControlThreads": 0,
  "indexSearcherCacheStats": {
    "requestCount": 0,
    "hitCount": 0,
    "hitRate": 1,
    "loadCount": 0,
    "missCount": 0,
    "missRate": 0,
    "evictionCount": 0,
    "indexFilesInMemorySize": 0,
    "indexFilesTempFileSize": 0
  }
}