Example usage for org.apache.hadoop.hdfs.server.protocol DatanodeProtocol versionID

Introduction

In this page you can find the example usage for org.apache.hadoop.hdfs.server.protocol DatanodeProtocol versionID.

Prototype

long versionID

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Document

This class is used by both the Namenode (client) and BackupNode (server) to insulate from the protocol serialization.

Usage

From source file:common.DataNode.java

License:Apache License

/**
 * Create the DataNode given a configuration and an array of dataDirs.
 * 'dataDirs' is where the blocks are stored.
 *//*w w w  . j  a v a2  s .  c  om*/
DataNode(final Configuration conf, final AbstractList<File> dataDirs) throws IOException {
    this(conf, dataDirs, (DatanodeProtocol) RPC.waitForProxy(DatanodeProtocol.class, DatanodeProtocol.versionID,
            NameNode.getAddress(conf), conf));
}

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From source file:common.NameNode.java

License:Apache License

public long getProtocolVersion(String protocol, long clientVersion) throws IOException {
    if (protocol.equals(ClientProtocol.class.getName())) {
        return ClientProtocol.versionID;
    } else if (protocol.equals(DatanodeProtocol.class.getName())) {
        return DatanodeProtocol.versionID;
    } else if (protocol.equals(NamenodeProtocol.class.getName())) {
        return NamenodeProtocol.versionID;
    } else if (protocol.equals(RefreshAuthorizationPolicyProtocol.class.getName())) {
        return RefreshAuthorizationPolicyProtocol.versionID;
    } else if (protocol.equals(RefreshUserToGroupMappingsProtocol.class.getName())) {
        return RefreshUserToGroupMappingsProtocol.versionID;
    } else {/*from   w w w.  j  a  v a2  s . c  o  m*/
        throw new IOException("Unknown protocol to name node: " + protocol);
    }
}

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