public static HttpResult ReadFilePart(string file, long offset, long size)
{
try
{
if (string.IsNullOrWhiteSpace(file))
{
throw new ArgumentNullException("file");
}
if (null == GetStatus(file))
{
return new HttpResult()
{
Code = -1,
ErrorLog = "File Not Exist."
}
}
;
string args = string.Format("&offset={0}&length={1}", offset, size);
string url = BuildUrl(file, WebHdfsAPI.OPEN, "user.name=hadoop&noredirect=false" + args);
string redirUrl = HttpClientHelperV45.GetRedirectedURL(url, HttpMethod.GET);
if (!string.IsNullOrWhiteSpace(redirUrl))
{
url = TranslateHostname(redirUrl);
}
return(HttpClientHelperV45.Request(url, new TimeSpan(0, 0, 6)));
}
catch (Exception ex)
{
DebugHelper.OutLog("获取HDFS文件失败：" + ex.Message);
DebugHelper.Error(ex, ex.Message);
return(null);
}
}
/// <summary>
/// 下载HDFS文件
/// </summary>
/// <param name="file">文件名</param>
/// <returns></returns>
public static byte[] GetFile(string file)
{
try
{
if (string.IsNullOrWhiteSpace(file))
{
throw new ArgumentNullException("file");
}
if (null == GetStatus(file))
{
return(Encoding.UTF8.GetBytes("File Not Exist."));
}
string url = BuildUrl(file, WebHdfsAPI.OPEN, "user.name=atlas&noredirect=false");
string redirUrl = HttpClientHelperV45.GetRedirectedURL(url, HttpMethod.GET);
if (!string.IsNullOrWhiteSpace(redirUrl))
{
url = TranslateHostname(redirUrl);
}
HttpResult res = HttpClientHelperV45.Request(url, new TimeSpan(1, 0, 0));
if (200 == res.Code)
{
return(res.Content);
}
else
{
throw new Exception(res.ErrorLog);
}
}
catch (Exception ex)
{
string err = ex.Message;
if (ex is WebException)
{
err = HttpClientHelperV45.ParseHdfsWebException(ex as WebException);
}
DebugHelper.OutLog("获取HDFS文件失败：" + err);
DebugHelper.Error(ex, err);
return(null);
}
}