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https://issues.apache.org/jira/browse/HDFS-7523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260901#comment-14260901
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Liang Xie commented on HDFS-7523:
---------------------------------
let me report number once get change, and i think we also need to make the
buffer size configurable. e.g. we had hit the tcp incast issue in one of our
hadoop cluster, and the rack switch buffer is overflowed, in this case, i
think it would be great to have a small enough buffer size to relieve that
network issue:)
> Setting a socket receive buffer size in DFSClient
> -------------------------------------------------
>
> Key: HDFS-7523
> URL: https://issues.apache.org/jira/browse/HDFS-7523
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: dfsclient
> Affects Versions: 2.6.0
> Reporter: Liang Xie
> Assignee: Liang Xie
> Attachments: HDFS-7523-001 (1).txt, HDFS-7523-001 (1).txt,
> HDFS-7523-001.txt, HDFS-7523-001.txt, HDFS-7523-001.txt
>
>
> It would be nice if we have a socket receive buffer size while creating
> socket from client(HBase) view, in old version it should be in
> DFSInputStream, in trunk it seems should be at:
> {code}
> @Override // RemotePeerFactory
> public Peer newConnectedPeer(InetSocketAddress addr,
> Token<BlockTokenIdentifier> blockToken, DatanodeID datanodeId)
> throws IOException {
> Peer peer = null;
> boolean success = false;
> Socket sock = null;
> try {
> sock = socketFactory.createSocket();
> NetUtils.connect(sock, addr,
> getRandomLocalInterfaceAddr(),
> dfsClientConf.socketTimeout);
> peer = TcpPeerServer.peerFromSocketAndKey(saslClient, sock, this,
> blockToken, datanodeId);
> peer.setReadTimeout(dfsClientConf.socketTimeout);
> {code}
> e.g: sock.setReceiveBufferSize(HdfsConstants.DEFAULT_DATA_SOCKET_SIZE);
> the default socket buffer size in Linux+JDK7 seems is 8k if i am not wrong,
> this value sometimes is small for HBase 64k block reading in a 10G network(at
> least, more system call)
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