[GitHub] [cassandra] Deepak-Vohra commented on a change in pull request #406: Improved/streaming

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Deepak-Vohra commented on a change in pull request #406: Improved/streaming
URL: https://github.com/apache/cassandra/pull/406#discussion_r381600907
 
 

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 File path: doc/source/new/streaming.rst
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+..
+..     http://www.apache.org/licenses/LICENSE-2.0
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+
+Improved Streaming  
+---------------------  
+
+Apache Cassandra 4.0 has made several improvements to streaming.  Streaming is the process used by nodes of a cluster to exchange data in the form of SSTables.  Streaming of SSTables is performed for several operations, such as:
+
+-          SSTable Repair
+-          Host Replacement
+-          Range movements
+-          Bootstrapping
+-          Rebuild
+-          Cluster expansion
+
+Streaming based on Netty
+^^^^^^^^^^^^^^^^^^^^^^^^
+
+Streaming in Cassandra 4.0 is based on Non-blocking Input/Output (NIO) with Netty (`CASSANDRA-12229
+<https://issues.apache.org/jira/browse/CASSANDRA-12229>`_). It replaces the single-threaded (or sequential), synchronous, blocking model of streaming messages and transfer of files. Netty supports non-blocking, asynchronous, multi-threaded streaming with which multiple connections are opened simultaneously.  Non-blocking implies that threads are not blocked as they don’t wait for a response for a sent request. A response could be returned in a different thread. With asynchronous, connections and threads are decoupled and do not have a 1:1 relation. Several more connections than threads may be opened.   Netty version 4.1.28 is used.
 
 Review comment:
   Removed.

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