Node.js multiple process to writestream on same file

Question

Is it okay to multiple process to write data to same file using writestream? what about the performance impact and data loss??

var fs = require('fs');
var cluster = require('cluster');
if(cluster.isMaster){
for(var i=0;i<10; i++)
{
    var child = cluster.fork();
}
}
else{
var stream = fs.createWriteStream('data.txt', {flags:'a'});
stream.on('error', function(error){
    console.log(process.pid+' error occured', error);
})
stream.write(process.pid+' msg\n');
//lots of writes
}