Using R, Unable to Read Image files on Azure DataLakeStore -


using r, trying read image files using webhdfs api on azure datalakestore. not working.

however, can read text files using webhdfs api sitting next image file, using same code, no issues. also, can read image files openly available on internet.

1. code read jpg on datalakestore (doesnt work) using webhdfs api

a <- get("https://.azuredatalakestore.net/webhdfs/v1//pic.jpg?op=open&read=true", add_headers(authorization = "bearer "))

a$status_code == 403

or

a <- get("https://.azuredatalakestore.net/webhdfs/v1//pic.jpg", add_headers(authorization = "bearer "))

a$status_code == 400

2. code read jpg on open web (works fine)

a <- get("http://cran.r-project.org/rlogo.jpg")

a$status_code == 200 x <- content(a)

plot(0:1, 0:1, type = "n")

rasterimage(x, 0, 0, 1, 1)

3. code read text (sitting next image file on datalakestore (works fine) using webhdfs api

a <- get("https://.azuredatalakestore.net/webhdfs/v1//testfile3.txt?op=open&read=true", add_headers(authorization = "bearer ")) a$status_code == 200


Comments

Post a Comment

Popular posts from this blog

javascript - Create a stacked percentage column -

i have collection of data : var data = [ {"p301a":"10","p301b":"7","p301c":"7","p301d":"3","p301e":"8","p301f":"8","p301g":"8","p301h":"8","p301i":"8","p301j":"8","p301k":"8","p301l":"8","p301m":"8","p301n":"8","p301o":"8","age":"31-40 years","profesion":"2","position":"2"}, {"p301a":"5","p301b":"4","p301c":"4","p301d":"4","p301e":"4","p301f":"4","p301g":"4","p301h":"4","p301i":"4","p301j":"4","p301k":"4...
Read more

Optimising Firebase database by automatically overwriting data -

in firebase app have following structure: posts latest all users can write posts > latest . want limit entries 20 posts save space in database. , posts beyond 20 unnecessary never shown on homepage. how can limit posts 20, when user writes posts > latest posts @ end drop off (be deleted) automatically? this sample should you. you need : const max_log_count = 20; exports.removeold = functions.database.ref('/posts/latest/{postid}').oncreate(event => { const parentref = event.data.ref.parent; return parentref.once('value').then(snapshot => { if (snapshot.numchildren() >= max_log_count) { let childcount = 0; const updates = {}; snapshot.foreach(function(child) { if (++childcount <= snapshot.numchildren() - max_log_count) { updates[child.key] = null; } }); // update parent. removes children. ...
Read more

javascript - Angular UI-Grid customTemplate directive causing rows to load slowly/? -

Image
each grid cell can have more 1 customtemplate loaded. have directive holds watcher on model_col_field listen cell updates on scroll when dom rows updated , recompile celltemplate . without watcher , $compile rows repeat on scroll, showing same set of rows. is there more angular way of approaching or way improve performance? relevant controller code: create gridoptions.data & gridoptions.columndefs : var customtemp = '<div ng-repeat="opt in grid.appscope.colvalueoptionsmodel" ng-init="tempstring=model_col_field.clazz+opt.key;"><comparison-directive dbo="model_col_field" attobj="opt" fff="grid.appscope.getattributetemplate(tempstring)" /></div>'; $scope.gridoptions.columndefs = [ { name:'yindex',pinnedleft:true,celltemplate: customtemp, displayname:'index'}, { name:'col1',celltemplate: customtemp}, { name:'col2',celltemplate: c...
Read more