java - How to properly initialize task state at Apache Flink? -


i working on financial anti-fraud system, based on apache flink. need calculate many different aggregates, based on financial transactions. use kafka stream data source. example, in average transaction amount calculation use mapstate storing total transactions count , total amount per card. aggregated data stored @ apache accumulo. know persistent states in flink, not need. there way load initial data flink before computation begins? can done using 2 connected streams data accumulo latest computed aggregates , transactions stream? transactions stream infinite, aggregates stream not. way should dig to? appreciated.

i've thought asyncio, states can't used async functions. idea was: check aggregates @ in-memory state. if there no data card here - code makes call storage service, fetch data it, performs computations , updates in-memory state, so, next transaction card don't need processed call external data service. think big bottleneck.

you try way:

task::setinitialstate     task::invoke         create basic utils (config, etc) , load chain of operators         setup-operators         task-specific-init         initialize-operator-states         open-operators         run         close-operators         dispose-operators         task-specific-cleanup         common-cleanup

Comments

Post a Comment

Popular posts from this blog

What is happening when Matlab is starting a "parallel pool"? -

running parallel cpu processes in matlab starts command parpool() according documentation , function: [creates] special job on pool of workers, , [connects] matlab client parallel pool. this function takes bit of time execute, on order of 30 seconds. in other multi-cpu paradigms openmp, parallel execution seems totally transparent -- i've never noticed behavior analogous matlab (granted i'm not experienced parallel programming). so, happening between time parpool() called , when finishes executing? takes long? parallel computing toolbox enables run matlab code in parallel using several different paradigms (e.g. jobs , tasks, parfor , spmd , parfeval , batch processing), , run either locally (parallelised across cores in local machine) or remotely (parallelised across machines in cluster - either 1 own, or 1 in cloud). in of these cases, code run on matlab workers , copies of matlab without interactive desktop. if you're intending run on remo...
Read more

angular - DownloadURL return null in below code -

when change file updated in firebase storage when try downloadurl show null. filechange(event: any) { const imagefolder: string = this.employee.id; const filelist: filelist = event.target.files; const file: file = filelist[0]; const storageref = firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file); console.log(storageref.snapshot.downloadurl); } the put() asynchronous. if want url after file uploaded have this: firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file).then((snapshot) => { storageref = snapshot.downloadurl: console.log(snapshot.downloadurl); });
Read more

php - Cannot override Laravel Spark authentication with own implementation -

during login process of laravel spark need request token of remote api. api stores exact same users , passwords laravel spark application. therefore need username , non hashed password of user during authentication process. i thought overriding authenticated method solution problem. in routes/web.php override post /login endpoint , pointing endpoint own logincontroller: <?php namespace app\http\controllers\auth; use illuminate\support\facades\log; use illuminate\http\request; use laravel\spark\http\controllers\auth\logincontroller sparklogincontroller; class logincontroller extends sparklogincontroller { /** * create new login controller instance. * * @return void */ public function __construct() { parent::__construct(); } /** * handle successful authentication attempt. * * @param request $request * @param \illuminate\contracts\auth\authenticatable $user * @return response */ public fu...
Read more