load balancing - Should I use Oort or write my own forwarding using CometD, when nodes don't need to know about each other? -


my app work follows:

i'll have bunch of replica servers , load balancer. data updates managed outside cometd. edit: still intend notify each cometd server of updates, if necessary, can respond clients.

the clients subscribing updates (i.e. read only), cometd server nodes don't need know each other's behavior.

am right in thinking have server side "client" instances on load balancer, per client connection, each instance listens on same channel respective client , forwards messages it? if so, there disadvantages approach, instead of using oort?

reading docs oort, seems nodes "know" each other, don't need. better me avoid using oort altogether, in case? concern if ended adding many many nodes, fact communicate "each other" mean unnecessary processing?

the description of issue specifies data updates managed outside cometd, not detail how cometd servers notified of these data updates.

the 2 common solutions a) notify each cometd server or b) use oort.

in solution a) have event triggers data update, , external application performs data update on, say, database. @ point external application must notify cometd servers there data update. if external application runs on jvm, can use cometd java client send message each cometd server, notifying them of data update; in turn, cometd servers notify remote clients.

in solution b) external application must notify 1 cometd server there data update; oort cluster rest, broadcasting message across cluster, , remote clients.

solution a) not require oort cluster, requires external application know nodes, , send message each node.

solution b) uses oort, external application needs know 1 oort node.

oort requires bit of additional processing because nodes interconnected, depending on case processing may negligible, or complications of notifying each cometd server "manually" (as in solution a) may greater running oort.

i don't understand mean having "server side client instances on load balancer". typically load balancers don't run jvm not possible run cometd clients on them, sentence not sound right.

besides cometd documentation, can @ these slides.


Comments

Post a Comment

Popular posts from this blog

c# - Validate object ID from GET to POST -

i have method allows user access comment have made on site. have post method lets them update comment. my normal solution send entire comment model through, let them update it, update on database when post back. involve sending commentid through in hiddenfor , can manipulated. how can verify commentid sent in get method same i'm getting in post , not able alter comment wish? how can verify commentid sent in method same i'm getting in post? basically have validate following things in post - user logged-in user. authenticated users post comments. commentid in post , should valid commentid , should present in database. userid associated logged-in user should same userid associated comment . comment should contain userid column, can check @ time of update. to make sure update happens comment has been sent in get - hold commentid in session , in post action compare commentid value in session .
Read more

node.js - Custom Model Validator SailsJS -

when using custom model validator checks record within model. return within spread doesn't seem end control flow. //post.js model /** * custom validator **/ types: { isuservalid: function(user_id) { var promise = require('bluebird'); promise.all([ user.findone({id: user_id}) ]) .spread(function(user) { console.log(user); if (user === null || user === undefined) { console.log('failed'); return false; }else{ console.log('passed'); return true; } }); } }, my response standard validation failed response. { "error": "e_validation", "status": 400, "summary": "1 attribute invalid", "model": "post", "invalidattributes": { "owner": [ { "rule": "isuservalid", ...
Read more

php - Find a regex to take part of Email -

i have following emails need extract part from: bestellnummer xxx: 1 von xxx, 1er pack ------------- anfang der nachricht ------------- foo bar baz foo bar baz // <<<<< need text here ------------- ende der nachricht ------------- ------------- anfang der nachricht ------------- foo bar baz foo bar baz ------------- ende der nachricht ------------- there 0 unlimited occurences of ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- and i'm able extract first part regex: $re = "/------------- .*? -------------.?(.*?).?------------- .*? -------------/s"; but, i'm quite new on learning regex, i'm pretty sure there must better regex extract part (foo bar baz foo bar baz) of text between ------------- anfang der nachricht ------------- ------------- ende der nachricht ------------- as can in different languages, i'm using .? to match between hyphens. i...
Read more