The cluster() GraphQL query is used to retrieve information about a cluster.

For information on clusters, see the Cluster Management documentation page. You may also want to look at the LogScale Logical Architecture page in the Training section.

Syntax

Below is the syntax for the cluster() query field:

graphql
cluster: Cluster!

In addition to entering cluster you'll have to specify which values you want returned for the datatype Cluster. Below is an example with several values requested:

Raw
graphql
query {
	cluster {
	  nodes {
       id, name, isAvailable, lastHeartbeat,
       targetSize, primarySize
    },
    clusterInfoAgeSeconds,
    clusterManagementSettings {allowRebalanceExistingSegments}
    stats{compressedByteSize, uncompressedByteSize}
	}
}
Mac OS or Linux (curl)
shell
curl -v -X POST $YOUR_LOGSCALE_URL/graphql \
    -H "Authorization: Bearer $TOKEN" \
    -H "Content-Type: application/json" \
    -d @- << EOF
{"query" : "query {
	cluster {
	  nodes {
       id, name, isAvailable, lastHeartbeat,
       targetSize, primarySize
    },
    clusterInfoAgeSeconds,
    clusterManagementSettings {allowRebalanceExistingSegments}
    stats{compressedByteSize, uncompressedByteSize}
	}
}"
}
EOF
Mac OS or Linux (curl) One-line
shell
curl -v -X POST $YOUR_LOGSCALE_URL/graphql \
    -H "Authorization: Bearer $TOKEN" \
    -H "Content-Type: application/json" \
    -d @- << EOF
{"query" : "query {
	cluster {
	  nodes {
       id, name, isAvailable, lastHeartbeat,
       targetSize, primarySize
    },
    clusterInfoAgeSeconds,
    clusterManagementSettings {allowRebalanceExistingSegments}
    stats{compressedByteSize, uncompressedByteSize}
	}
}"
}
EOF
Windows Cmd and curl
shell
curl -v -X POST $YOUR_LOGSCALE_URL/graphql ^
    -H "Authorization: Bearer $TOKEN" ^
    -H "Content-Type: application/json" ^
    -d @'{"query" : "query { ^
	cluster { ^
	  nodes { ^
       id, name, isAvailable, lastHeartbeat, ^
       targetSize, primarySize ^
    }, ^
    clusterInfoAgeSeconds, ^
    clusterManagementSettings {allowRebalanceExistingSegments} ^
    stats{compressedByteSize, uncompressedByteSize} ^
	} ^
}" ^
} '
Windows Powershell and curl
powershell
curl.exe -X POST 
    -H "Authorization: Bearer $TOKEN"
    -H "Content-Type: application/json"
    -d '{"query" : "query {
	cluster {
	  nodes {
       id, name, isAvailable, lastHeartbeat,
       targetSize, primarySize
    },
    clusterInfoAgeSeconds,
    clusterManagementSettings {allowRebalanceExistingSegments}
    stats{compressedByteSize, uncompressedByteSize}
	}
}"
}'
    "$YOUR_LOGSCALE_URL/graphql"
Perl
perl
#!/usr/bin/perl

use HTTP::Request;
use LWP;

my $INGEST_TOKEN = "TOKEN";

my $uri = '$YOUR_LOGSCALE_URL/graphql';

my $json = '{"query" : "query {
	cluster {
	  nodes {
       id, name, isAvailable, lastHeartbeat,
       targetSize, primarySize
    },
    clusterInfoAgeSeconds,
    clusterManagementSettings {allowRebalanceExistingSegments}
    stats{compressedByteSize, uncompressedByteSize}
	}
}"
}';
my $req = HTTP::Request->new("POST", $uri );

$req->header("Authorization" => "Bearer $TOKEN");
$req->header("Content-Type" => "application/json");

$req->content( $json );

my $lwp = LWP::UserAgent->new;

my $result = $lwp->request( $req );

print $result->{"_content"},"\n";
Python
python
#! /usr/local/bin/python3

import requests

url = '$YOUR_LOGSCALE_URL/graphql'
mydata = r'''{"query" : "query {
	cluster {
	  nodes {
       id, name, isAvailable, lastHeartbeat,
       targetSize, primarySize
    },
    clusterInfoAgeSeconds,
    clusterManagementSettings {allowRebalanceExistingSegments}
    stats{compressedByteSize, uncompressedByteSize}
	}
}"
}'''

resp = requests.post(url,
                     data = mydata,
                     headers = {
   "Authorization" : "Bearer $TOKEN",
   "Content-Type" : "application/json"
}
)

print(resp.text)
Node.js
javascript
const https = require('https');

const data = JSON.stringify(
    {"query" : "query {
	cluster {
	  nodes {
       id, name, isAvailable, lastHeartbeat,
       targetSize, primarySize
    },
    clusterInfoAgeSeconds,
    clusterManagementSettings {allowRebalanceExistingSegments}
    stats{compressedByteSize, uncompressedByteSize}
	}
}"
}
);


const options = {
  hostname: '$YOUR_LOGSCALE_URL/graphql',
  path: '/graphql',
  port: 443,
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Content-Length': data.length,
    Authorization: 'BEARER ' + process.env.TOKEN,
    'User-Agent': 'Node',
  },
};

const req = https.request(options, (res) => {
  let data = '';
  console.log(`statusCode: ${res.statusCode}`);

  res.on('data', (d) => {
    data += d;
  });
  res.on('end', () => {
    console.log(JSON.parse(data).data);
  });
});

req.on('error', (error) => {
  console.error(error);
});

req.write(data);
req.end();
Example Responses
Success (HTTP Response Code 200 OK)
json
{
  "data": {
    "cluster": {
      "nodes": [
        {
          "name": "localhost:8080",
          "primarySize": 0.1325218,
          "lastHeartbeat": "2024-09-02T09:37:25.387Z",
          "targetSize": 0.105984672,
          "id": 1,
          "isAvailable": true
        }
      ],
      "clusterInfoAgeSeconds": 0.935,
      "clusterManagementSettings": {
        "allowRebalanceExistingSegments": true
      },
      "stats": {
        "compressedByteSize": 133674640,
        "uncompressedByteSize": 1797456088
      }
    }
  }
}

Notice in the example above that some value requests required sub-requests. For instance, nodes has a few values of its own that were requested, like isAvailable. These are all separated by commas, but that's not necessary after the curly-brackets (e.g., there's no comma before stats).

Given Datatypes

For the given datatype, cluster, there are several parameters that may be given. Below is a list of them along with their datatypes and a description of each:

Table: Cluster

ParameterTypeRequiredDefaultDescription
Some arguments may be required, as indicated in the Required column. For some fields, this column indicates that a result will always be returned for this column.
Table last updated: Sep 24, 2024
clusterInfoAgeSecondsfloatyes The cluster information age in seconds.
clusterManagementSettingsClusterManagementSettingsyes The settings for the LogScale cluster (see See ClusterManagementSettings.
defaultCachePolicyCachePolicyyes The default cache policy. See CachePolicy. Cache policies are a limited preview feature and subject to change.
digestReplicationFactorinteger  The digest replication factor.
inBucketStorageSegmentSizefloatyes The in bucket storage segment size.
ingestPartitions[IngestPartition]yes The ingest partitions. See IngestPartition.
missingSegmentSizefloatyes The missing segment size.
nodes[ClusterNode]yes The nodes of the cluster. See ClusterNode.
overReplicatedSegmentSizefloatyes The over replicated segment size.
pendingBucketStorageRiskySegmentSizefloatyes The pending bucket storage risky segment size.
pendingBucketStorageSegmentSizefloatyes The pending bucket storage segment size.
properlyReplicatedSegmentSizefloatyes The properly replicated segment size.
statsClusterStatsyes The cluster stats. See ClusterStats.
storageReplicationFactorinteger  The storage replication factor.
targetMissingSegmentSizefloatyes The target missing segment size.
targetOverReplicatedSegmentSizefloatyes The target over replicated segment size.
targetProperlyReplicatedSegmentSizefloatyes The target properly replicated segment size.
targetUnderReplicatedSegmentSizefloatyes The target under replicated segment size.
underReplicatedSegmentSizefloatyes The under replicated segment size.