Example usage for org.apache.hadoop.hdfs DFSConfigKeys DFS_BLOCK_LOCAL_PATH_ACCESS_USER_KEY

Introduction

In this page you can find the example usage for org.apache.hadoop.hdfs DFSConfigKeys DFS_BLOCK_LOCAL_PATH_ACCESS_USER_KEY.

Prototype

String DFS_BLOCK_LOCAL_PATH_ACCESS_USER_KEY

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Usage

From source file:com.cloudera.impala.service.JniFrontend.java

License:Apache License

/**
 *  Checks the data node's server side configuration by reading the CONF from the data
 *  node.//  w  w  w  . j a v a  2 s .  c o m
 *  This appends error messages to errorCause prefixed by prefix if data node
 *  configuration is not properly set.
 */
private void cdh41ShortCircuitReadDatanodeCheck(StringBuilder errorCause, String prefix) {
    String dnWebUiAddr = CONF.get(DFSConfigKeys.DFS_DATANODE_HTTP_ADDRESS_KEY,
            DFSConfigKeys.DFS_DATANODE_HTTP_ADDRESS_DEFAULT);
    URL dnWebUiUrl = null;
    try {
        dnWebUiUrl = new URL("http://" + dnWebUiAddr + "/conf");
    } catch (Exception e) {
        LOG.info(e.toString());
    }
    Configuration dnConf = new Configuration(false);
    dnConf.addResource(dnWebUiUrl);

    // dfs.datanode.data.dir.perm should be at least 750
    int permissionInt = 0;
    try {
        String permission = dnConf.get(DFSConfigKeys.DFS_DATANODE_DATA_DIR_PERMISSION_KEY,
                DFSConfigKeys.DFS_DATANODE_DATA_DIR_PERMISSION_DEFAULT);
        permissionInt = Integer.parseInt(permission);
    } catch (Exception e) {
    }
    if (permissionInt < 750) {
        errorCause.append(prefix);
        errorCause.append("Data node configuration ");
        errorCause.append(DFSConfigKeys.DFS_DATANODE_DATA_DIR_PERMISSION_KEY);
        errorCause.append(" is not properly set. It should be set to 750.\n");
    }

    // dfs.block.local-path-access.user should contain the user account impala is running
    // under
    String accessUser = dnConf.get(DFSConfigKeys.DFS_BLOCK_LOCAL_PATH_ACCESS_USER_KEY);
    if (accessUser == null || !accessUser.contains(System.getProperty("user.name"))) {
        errorCause.append(prefix);
        errorCause.append("Data node configuration ");
        errorCause.append(DFSConfigKeys.DFS_BLOCK_LOCAL_PATH_ACCESS_USER_KEY);
        errorCause.append(" is not properly set. It should contain ");
        errorCause.append(System.getProperty("user.name"));
        errorCause.append("\n");
    }
}

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