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  1. JDK
  2. JDK-8343855

HTTP/2 ConnectionWindowUpdateSender may miss some unprocessed DataFrames from closed streams

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        JDK-8342075 has introduced more flow controls checks, but also introduced a race condition where DataFrames for closed streams may fail to be discounted from the connection window.

        The consequence is that WINDOW_UPDATE frames for the connection window may not be sent when they should, preventing the server from making progress and stalling the connection.

        This can be shown by modifying the StreamFlowControlTest to send less but bigger frames (e.g. chunks of 1600 bytes instead of chunks of 12 bytes). With such a modification the test can be seen failing intermittently, when sameClient=true.

              dfuchs Daniel Fuchs
              dfuchs Daniel Fuchs
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