Service Restarts
Tackling
Which Restarts?
Detecting Restarts
Health Checks
-
Consul
-
Readiness probe
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Liveness probe - trigger restarts
-
Unhandled Errors
-
Blocking Code
-
Long GCs (rare)
Reasons for no response
in node.js services
Unhandled Errors
app.post('/register', (req: Request, res: Response) => {
// perform some action...
httpClient.post('api/audit');
res.send('ok');
});
app.post('/register', (req: Request, res: Response) => {
try {
// perform some action...
httpClient.post('api/audit');
res.send('ok');
} catch (err) {
res.status(500);
res.send('error');
}
});
app.post('/register', async (req: Request, res: Response) => {
try {
// perform some action...
await httpClient.post('api/audit');
res.send('ok');
} catch (err) {
res.status(500);
res.send('error');
}
});app.post('/register', async (req: Request, res: Response) => {
// perform some action...
httpClient.post('api/audit')
.catch(err => console.log(err));
res.send('ok');
});Tackling
Unhandled Errors
Blocking Code
Dealing with
Blocking Code
-
Not easy to detect \ find the cause
-
Improve visibility
-
Code reviews!