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There could be two reasons why we do not receive new transactions:. The second reason is definitely faster to check.

The last log entry is hashed block element. Since saving hash is the last stage, we know there is constant demand for elements generated by this stage. Technically the last stage is Sink. Therefore, we know that the last stage is responsible for not emitting elements at the beginning of the stream.

As it turns out the problem is with database becoming randomly unavailable:. Always have the backpressure in mind and treat the stream as a whole. Start debugging issues similar to the example above, by focusing on first and last stages and then shrink the suspicions circle.

If you encounter some issue on production you can always temporarily switch to debug via JMX. This way you can locate exactly which part of the stream is the root cause of the problem. When you are defining a linear stream, it looks like a description of processing.

  1. Requesting number of elements.
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Stages are executed one after another. The exception is alsoTo stage. The purpose of alsoTo is to send an element to the additional sink in the middle of processing and pass this element downstream. The above example looks like a linear flow since there is no Graph DSL involved. By looking at the stream for the first time there is a high chance you may think map will be executed after alsoTo. The actual output is:.

The truth is that the message is passed to alsoTo sink and then processing continues immediately. Why is it important? Imagine that you are processing temperature readings from multiple rooms. There is a requirement to store rooms and readings in a relational database. However this approach needs to be taken carefully.

Stream Quotes (33 quotes)

This is only possible if the library guarantees that unsubscribing from new incoming messages is handled synchronously. Otherwise, during the time of notifying the library of canceling the subscription and the actual stop of the message flow, there might still be undefined number of incoming messages which the connector might not be able to handle. Akka Streams gives its user the privilege of not thinking of ensuring flow control at all when working inside the world of Akka Streams. But a wanderer like you, that travels on the edge between the world of Akka Streams and another library is going to have to take one or the other approach when implementing a connector to a library.

The general approach is to firstly see if it is possible to request only a set number of elements from the library. If that is not possible, see if blocking the library thread is going to be a good signal to stop any other messages from coming in. And finally, last resort is going to be toggling the interest of new messages.

Cookies are required for this functionality. Latest news Dec 11 Requesting number of elements A straightforward approach is to signal explicitly how many elements an Akka Streams connector is able to receive. This post is part of the "Integration" series. Explore other posts in this series: Audio is supported over HDMI at If the network has a captive portal that requires you to authenticate to gain access to the Internet, such as those commonly used by hotels, libraries, and courtesy networks , Webcaster X2 can not be used to stream live using that network.

Use a mobile hot spot, LTE network device, or another network that does not require authentication. You get a "No Signal" message on the front screen or attached display. My camera still isn't working with Webcaster X2. Click the Preferences icon at the lower right corner of the screen.

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The preferences screen opens. There's no device pairing code showing on the display or when I click the pair icon using a connected HDMI display and mouse? Your live stream has no audio. Your live stream has distorted or pitch-shifted audio. Streamed video is pixelated or contains audio distortions such as clicks and pops. Streamed video has dropped frames. If you find this happening to your stream try the following tips: Also, if you pause and resume your live stream, the two numbers may not match exactly.

There is no device code or pairing button on the display. Also, check if your monitor supports p mode. If it does not, use another monitor. If you experience this issue, change the display resolution setting in Webcaster X2 or attach a different monitor that isn't 4K: You do not see the information overlay with buttons for pair, preferences, info, etc on your attached HDMI display.

Click the left mouse button to show or hide the overlay as needed.

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Your live stream only contains a black screen. The video on your attached HDMI display appears stretched by a small amount. Your live stream quality looks poor on Facebook. Your live stream does not appear on your Facebook Timeline, but Webcaster X2 says it is streaming. You've set Webcaster X2 to stream with the post privacy Public , but your live broadcast has the wrong privacy level e.


Only Me or Friends. An SSL handshake error appears when doing a pre-configured live stream to Facebook. You get the error: For example, only one of these two channels is verified, I need to choose it explicitly: YouTube says your stream health is good, but the Live Dashboard says Live stream offline. Your YouTube event doesn't appear in the list of available publishing destinations. Your live event stream didn't go live automatically. The pairing code doesn't work and is invalid.