In my node.js application, I'm using JDBC to connect to a Oracle database. I need to increase my java heap space to prevent following error:
java.lang.OutOfMemoryError: Java heap space
I know that there is a terminal option for setting maximum Java heap size (-Xmx<size>) but the problem is, I don't explicitly run java, it happens inside my JDBC module (which depends on java module), so I can't use that terminal option.
So how java heap size can be configured in my case?
In my node.js application, I'm using JDBC to connect to a Oracle database. I need to increase my java heap space to prevent following error:
java.lang.OutOfMemoryError: Java heap space
I know that there is a terminal option for setting maximum Java heap size (-Xmx<size>) but the problem is, I don't explicitly run java, it happens inside my JDBC module (which depends on java module), so I can't use that terminal option.
So how java heap size can be configured in my case?
I'm using node.js cluster module to create worker processes. And I set a custom variable in each worker's environment as I fork it.
I need to read that custom variable when a worker dies, but when a worker dies, I can't access its environment object anymore.
This is what I tried so far:
var cluster = require('cluster'),
os = require('os');
if (cluster.isMaster) {
cluster.on('exit', function (worker, code, signal) {
console.log('worker ' + worker.process.pid + ' died');
var x = {
workerId: worker.process.env.workerId // This is undefined.
};
cluster.fork(x);
});
for (var i = 0; i < os.cpus().length; i++) {
var x = {
workerId: i
};
cluster.fork(x);
}
}
else {
console.log("workerId: ", process.env.workerId);
// simulate an exeption:
throw "fakeError";
}
I know that's not gonna work, my question is: how to access to latest state of a worker's envoronment right before its death?
I'm using node.js cluster module to create worker processes. And I set a custom variable in each worker's environment as I fork it.
I need to read that custom variable when a worker dies, but when a worker dies, I can't access its environment object anymore.
This is what I tried so far:
var cluster = require('cluster'),
os = require('os');
if (cluster.isMaster) {
cluster.on('exit', function (worker, code, signal) {
console.log('worker ' + worker.process.pid + ' died');
var x = {
workerId: worker.process.env.workerId // This is undefined.
};
cluster.fork(x);
});
for (var i = 0; i < os.cpus().length; i++) {
var x = {
workerId: i
};
cluster.fork(x);
}
}
else {
console.log("workerId: ", process.env.workerId);
// simulate an exeption:
throw "fakeError";
}
I know that's not gonna work, my question is: how to access to latest state of a worker's envoronment right before its death?
I need to create a user for my database in mongodb, but it seems that I can't get it to work.
I have installed mongoDb v3.0.5 on my windows 7 machine. according to this article, I connected to my mongo instance using:
mongo -u siteUserAdmin -p password
and then I created first user via:
use admin
db.createUser(
{
user: "siteUserAdmin",
pwd: "password",
roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
}
)
then I created a user for my nodejs application on exampleDb:
use admin
db.createUser(
{
user: "myUser",
pwd: "123456",
roles: [ { role: "readWrite", db: "exampleDb" } ]
}
)
and finally in my nodejs application, when I try to connect to my mongo instance using this connection string:
var connString = "mongodb://myUser:123456@127.0.0.1:27017/exampleDb";
an Authentication failed error happens:
{ name: 'MongoError',
message: 'Authentication failed.',
ok: 0,
code: 18,
errmsg: 'Authentication failed.'
}
I need to create a user for my database in mongodb, but it seems that I can't get it to work.
I have installed mongoDb v3.0.5 on my windows 7 machine. according to this article, I connected to my mongo instance using:
mongo -u siteUserAdmin -p password
and then I created first user via:
use admin
db.createUser(
{
user: "siteUserAdmin",
pwd: "password",
roles: [ { role: "userAdminAnyDatabase", db: "admin" } ]
}
)
then I created a user for my nodejs application on exampleDb:
use admin
db.createUser(
{
user: "myUser",
pwd: "123456",
roles: [ { role: "readWrite", db: "exampleDb" } ]
}
)
and finally in my nodejs application, when I try to connect to my mongo instance using this connection string:
var connString = "mongodb://myUser:123456@127.0.0.1:27017/exampleDb";
an Authentication failed error happens:
{ name: 'MongoError',
message: 'Authentication failed.',
ok: 0,
code: 18,
errmsg: 'Authentication failed.'
}
I need to extent q.promise with my own functions, I tried:
defer = q.defer();
defer.promise.prototype.funcName = function () {
// my function
}
witch returns following error:
TypeError: Cannot set property 'funcName' of undefined
How should I properly extend q.promise?
This is my actual problem: I need an alias for .then() witch gets name of an operation as argument (instead of a function), and executes that operation according to a internal library of functions.
I need to extent q.promise with my own functions, I tried:
defer = q.defer();
defer.promise.prototype.funcName = function () {
// my function
}
witch returns following error:
TypeError: Cannot set property 'funcName' of undefined
How should I properly extend q.promise?
Lets suppose I have my app running on machine A, at some point I need to shut down that machine, and transfer my app to machine B to continue its process. so I need to be able to save and restore context of my app.
How can implement that?
To be more specific, my question is: How can I save/restore application context in node.js?
Lets suppose I have my app running on machine A, at some point I need to shut down that machine, and transfer my app to machine B to continue its process. so I need to be able to save and restore context of my app.
How can implement that?
To be more specific, my question is: How can I save/restore application context in node.js?
Lets suppose I have my app running on machine A, at some point I need to shut down that machine, and transfer my app to machine B to continue its process. so I need to be able to save and restore context of my app.
How can implement that?
To be more specific, my question is: How can I save/restore application context in node.js?
In my node.js app, I need to use setImmediate() to recessively call a function and keep its context intact for next execution.
Consider following example:
var i=3;
function myFunc(){
console.log(i, this);
--i && setImmediate(arguments.callee);
}
myFunc();
Output:
3 // a regular `this` object
2 { _idleNext: null, _idlePrev: null, _onImmediate: [Function: myFunc] }
1 { _idleNext: null, _idlePrev: null, _onImmediate: [Function: myFunc] }
As you can see, after first execution this is overwritten. How should I work around this?
Salam (means Hello:))
In my node.js app, I need to use setImmediate() to recessively call a function and keep its context intact for next execution.
Consider following example:
var i=3;
function myFunc(){
console.log(i, this);
--i && setImmediate(arguments.callee);
}
myFunc();
Output:
3 // a regular `this` object
2 { _idleNext: null, _idlePrev: null, _onImmediate: [Function: myFunc] }
1 { _idleNext: null, _idlePrev: null, _onImmediate: [Function: myFunc] }
As you can see, after first execution this is overwritten. How should I work around this?