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Ján Holp 2020-10-23 07:41:12 +00:00
parent fe02c66cc0
commit e4bf004c74
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pages/students/2016/jan_holp/dp2021/zdrojove_subory/cassandra.js Normal file
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//Jan Holp, DP 2021
//client1 = cassandra
//client2 = elasticsearch
//-----------------------------------------------------------------
//require the Elasticsearch librray
const elasticsearch = require('elasticsearch');
const client2 = new elasticsearch.Client({
hosts: [ 'localhost:9200']
});
client2.ping({
requestTimeout: 30000,
}, function(error) {
// at this point, eastic search is down, please check your Elasticsearch service
if (error) {
console.error('Elasticsearch cluster is down!');
} else {
console.log('Everything is ok');
}
});
//create new index skweb2
client2.indices.create({
index: 'skweb2'
}, function(error, response, status) {
if (error) {
console.log(error);
} else {
console.log("created a new index", response);
}
});
const cassandra = require('cassandra-driver');
const client1 = new cassandra.Client({ contactPoints: ['localhost:9042'], localDataCenter: 'datacenter1', keyspace: 'websucker' });
const query = 'SELECT title FROM websucker.content WHERE body_size > 0 ALLOW FILTERING';
client1.execute(query)
.then(result => console.log(result)),function(error) {
if(error){
console.error('Something is wrong!');
console.log(error);
} else{
console.log('Everything is ok');
}
};
/*
async function indexData() {
var i = 0;
const query = 'SELECT title FROM websucker.content WHERE body_size > 0 ALLOW FILTERING';
client1.execute(query)
.then((result) => {
try {
//for ( i=0; i<15;i++){
console.log('%s', result.row[0].title)
//}
} catch (query) {
if (query instanceof SyntaxError) {
console.log( "Neplatne query" );
}
}
});
}
/*
//indexing method
const bulkIndex = function bulkIndex(index, type, data) {
let bulkBody = [];
id = 1;
const errorCount = 0;
data.forEach(item => {
bulkBody.push({
index: {
_index: index,
_type: type,
_id : id++,
}
});
bulkBody.push(item);
});
console.log(bulkBody);
client.bulk({body: bulkBody})
.then(response => {
response.items.forEach(item => {
if (item.index && item.index.error) {
console.log(++errorCount, item.index.error);
}
});
console.log(
`Successfully indexed ${data.length - errorCount}
out of ${data.length} items`
);
})
.catch(console.err);
};
*/