Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>One reason why this could be happening is the fact that there is one <code>HttpClient</code> instantiated on the outside of the loop. Since the loop then uses <code>HttpClientExtensions.PostAsJsonAsync</code> which takes in the <code>hc</code> variable, then it's possible that the repeated values for the keys in the <code>ConcurrentDictionary</code> is the result of <code>response</code> being overwritten as the first call to return from the <code>HttpClient</code> within all of the loop iterations. This would depend on the implementation of <code>PostAsJsonAsync</code>, but one easy way to test would be to instantiate a new <code>HttpClient</code> in the loop and see if that fixes it.</p> <p>Edit: Beware of using <code>.Result</code>, though it may not be the cause of your issue.</p> <blockquote> <p>“Async all the way” means that you shouldn’t mix synchronous and asynchronous code without carefully considering the consequences. In particular, it’s usually a bad idea to block on async code by calling Task.Wait or Task.Result. This is an especially common problem for programmers who are “dipping their toes” into asynchronous programming, converting just a small part of their application and wrapping it in a synchronous API so the rest of the application is isolated from the changes.</p> </blockquote> <p><a href="http://msdn.microsoft.com/en-us/magazine/jj991977.aspx" rel="nofollow">source</a></p> <p>Lastly, if you end up achieving only a 2x speedup when this is all working, consider tweaking this web.config tag:</p> <p><a href="http://msdn.microsoft.com/en-us/library/1tkaca2y.aspx" rel="nofollow">Sytem.NET MaxConnection property</a></p>
    singulars
    1. This table or related slice is empty.
    1. POConcurrently fill a dictionary with HttpClient PostAsJsonAsync extension
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USwelegan
    1. USwelegan
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COUsing `await` inside `Parallel.ForEach()` is a bad idea and won't work as expected. Using `SomethingAsync().Result` is often a bad choice, but I think it's reasonable here, since there is no synchronous version of the method (I think). In any case, I don't see how could this fix the issue.
      singulars
      1. PO
      1. USsvick
    2. COGood point about await in Parallel.ForEach(), I guess I didn't read the question carefully enough. The use of `.Result` was just a very common cause of error so I thought it was likely that.
      singulars
      1. PO
      1. USwelegan
    3. COYou're probably right about the cause now. `HttpClient` is not thread-safe, so using it from multiple threads like this is certainly wrong.
      singulars
      1. PO
      1. USsvick
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload