The setMinHostAlivePercentageToEnableClusterRebalancing() GraphQL mutation is used to set the percentage of all hosts relevant to a particular cluster rebalance operation that need to be alive before allowing the system to execute automatically the operation to the supplied value. Cluster rebalance operations currently include reassigning digest work, and moving existing segments to balance disk usage.

To allow segments to be moved between nodes, use the setAllowRebalanceExistingSegments() mutation. To set the segment replication factor, use setSegmentReplicationFactor(). To get information about a segment, use the segment() query.

API Stability Short-Term

Syntax

graphql
setMinHostAlivePercentageToEnableClusterRebalancing(
      minHostAlivePercentageToEnableClusterRebalancing: integer!
   ): integer

For this mutation, you'll have to give the percentage of hosts relevant to a cluster rebalance operation that needs to be alive before the system executes. See the Given Datatype section for more details on this.

Example

Raw
graphql
mutation {
  setMinHostAlivePercentageToEnableClusterRebalancing( 
       minHostAlivePercentageToEnableClusterRebalancing: 50
  )
}
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" : "mutation {
  setMinHostAlivePercentageToEnableClusterRebalancing( 
       minHostAlivePercentageToEnableClusterRebalancing: 50
  )
}"
}
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" : "mutation {
  setMinHostAlivePercentageToEnableClusterRebalancing( 
       minHostAlivePercentageToEnableClusterRebalancing: 50
  )
}"
}
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" : "mutation { ^
  setMinHostAlivePercentageToEnableClusterRebalancing(  ^
       minHostAlivePercentageToEnableClusterRebalancing: 50 ^
  ) ^
}" ^
} '
Windows Powershell and curl
powershell
curl.exe -X POST 
    -H "Authorization: Bearer $TOKEN"
    -H "Content-Type: application/json"
    -d '{"query" : "mutation {
  setMinHostAlivePercentageToEnableClusterRebalancing( 
       minHostAlivePercentageToEnableClusterRebalancing: 50
  )
}"
}'
    "$YOUR_LOGSCALE_URL/graphql"
Perl
perl
#!/usr/bin/perl

use HTTP::Request;
use LWP;

my $TOKEN = "TOKEN";

my $uri = '$YOUR_LOGSCALE_URL/graphql';

my $query = "mutation {
  setMinHostAlivePercentageToEnableClusterRebalancing( 
       minHostAlivePercentageToEnableClusterRebalancing: 50
  )
}";
$query =~ s/\n/ /g;
my $json = sprintf('{"query" : "%s"}',$query);
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" : "mutation {
  setMinHostAlivePercentageToEnableClusterRebalancing( 
       minHostAlivePercentageToEnableClusterRebalancing: 50
  )
}"
}'''

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" : "mutation {
  setMinHostAlivePercentageToEnableClusterRebalancing( 
       minHostAlivePercentageToEnableClusterRebalancing: 50
  )
}"
}
);


const options = {
  hostname: '$YOUR_LOGSCALE_URL',
  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": {
    "setMinHostAlivePercentageToEnableClusterRebalancing": 50
  }
}

Given Datatype

For the input, you have to give the percentage of all hosts relevant to a particular cluster rebalance operation that need to be alive before we allow the system to execute automatically the operation. Cluster rebalance operations currently include reassigning digest work, and moving existing segments to balance disk usage. Must be between 0 and 100, both inclusive.

Table: Input Using Standard Datatypes

Parameter Type Required Default Description
minHostAlivePercentageToEnableClusterRebalancing integer yes   The percentage of hosts relevant to a cluster rebalance operation that needs to be alive before the system executes.