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Date: Mon, 27 Dec 2010 11:58:46 -0500 (EST)
From: "Brandon Williams (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Subject: [jira] Updated: (CASSANDRA-1896) Improve throughput by adding
 buffering to the inter-node TCP communication
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     [ https://issues.apache.org/jira/browse/CASSANDRA-1896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brandon Williams updated CASSANDRA-1896:
----------------------------------------

    Affects Version/s: 0.6
        Fix Version/s: 0.7.1
                       0.6.9

> Improve throughput by adding buffering to the inter-node TCP communication
> --------------------------------------------------------------------------
>
>                 Key: CASSANDRA-1896
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1896
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.6
>            Reporter: Tsiki
>            Assignee: Brandon Williams
>             Fix For: 0.6.9, 0.7.1
>
>         Attachments: 1896.txt
>
>
> The inbound and outbound TCP implementation under org.apache.cassandra.net  does not buffer the socket streams. A simple change in IncomingTcpConnection and OutboundTcpConnection may give a rather big throughput increase. In my tests, I got up t o 30% more out of my cluster. Below is the diff of these two files with buffering included. The diff is over release 0.6.5 but can be quite simply applied also to 0.7. I suggest perhaps to limit the buffered input stream I added in IncomingTcpConnection to 4K. The Outbound implementation can surely be implemented a bit better (remove some of the code I duplicated there).
> diff -r apache-cassandra-0.6.5-src/src/java/org/apache/cassandra/net/IncomingTcpConnection.java fix/apache-cassandra-0.6.5-src/src/java/org/apache/cassandra/net/IncomingTcpConnection.java
> 44c44
> <             input = new DataInputStream(new BufferedInputStream(socket.getInputStream()));
> ---
> >             input = new DataInputStream(socket.getInputStream());
> diff -r apache-cassandra-0.6.5-src/src/java/org/apache/cassandra/net/OutboundTcpConnection.java fix/apache-cassandra-0.6.5-src/src/java/org/apache/cassandra/net/OutboundTcpConnection.java
> 77d76
> <     	byte[] buf = new byte[4096];
> 80,112c79,89
> <         	int l = 0;
> <         	ByteBuffer bb;
> <         	while ((bb = queue.peek()) != null && l+bb.limit() < buf.length) { 
> <         		bb = take();
> <         		System.arraycopy(bb.array(), 0, buf, l, bb.limit());
> <         		l += bb.limit();
> <         	}
> <         	if (l == 0) {
> < 	        	bb = take();
> < 	            if (bb == CLOSE_SENTINEL)
> < 	            {
> < 	                disconnect();
> < 	                continue;
> < 	            }
> < 	            if (socket != null || connect())
> < 	                writeConnected(bb);
> < 	            else
> < 	                // clear out the queue, else gossip messages back up.
> < 	                queue.clear();
> <         	} else {
> <         		if (socket != null || connect()) {
> < 	        		try {
> < 		        		output.write(buf, 0, l);
> < 		                if (queue.peek() == null)
> < 		                    output.flush();
> < 	        		} catch (IOException e) {
> < 	                    logger.info("error writing to " + endpoint);
> < 	                    disconnect();
> < 	        		}
> <         		} else {
> <         			queue.clear();
> <         		}
> <         	}
> ---
> >             ByteBuffer bb = take();
> >             if (bb == CLOSE_SENTINEL)
> >             {
> >                 disconnect();
> >                 continue;
> >             }
> >             if (socket != null || connect())
> >                 writeConnected(bb);
> >             else
> >                 // clear out the queue, else gossip messages back up.
> >                 queue.clear();            

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