Example usage for org.apache.hadoop.hdfs.server.protocol NamespaceInfo getLayoutVersion

Introduction

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

Prototype

public int getLayoutVersion() 

Source Link

Document

Layout version of the storage data.

Usage

From source file:common.DataNode.java

License:Apache License

private NamespaceInfo handshake() throws IOException {
    NamespaceInfo nsInfo = new NamespaceInfo();
    while (shouldRun) {
        try {//from   www .  jav a 2s  .  co  m
            nsInfo = namenode.versionRequest();
            break;
        } catch (SocketTimeoutException e) { // namenode is busy
            LOG.info("Problem connecting to server: " + getNameNodeAddr());
            try {
                Thread.sleep(1000);
            } catch (InterruptedException ie) {
            }
        }
    }
    String errorMsg = null;
    // verify build version
    if (!nsInfo.getBuildVersion().equals(Storage.getBuildVersion())) {
        errorMsg = "Incompatible build versions: namenode BV = " + nsInfo.getBuildVersion() + "; datanode BV = "
                + Storage.getBuildVersion();
        LOG.fatal(errorMsg);
        try {
            namenode.errorReport(dnRegistration, DatanodeProtocol.NOTIFY, errorMsg);
        } catch (SocketTimeoutException e) { // namenode is busy
            LOG.info("Problem connecting to server: " + getNameNodeAddr());
        }
        throw new IOException(errorMsg);
    }
    assert FSConstants.LAYOUT_VERSION == nsInfo
            .getLayoutVersion() : "Data-node and name-node layout versions must be the same." + "Expected: "
                    + FSConstants.LAYOUT_VERSION + " actual " + nsInfo.getLayoutVersion();
    return nsInfo;
}

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