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From "Liang Xie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7523) Setting a socket receive buffer size in DFSClient
Date Tue, 30 Dec 2014 08:07:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7523?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14260901#comment-14260901

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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