/// <exception cref="Javax.Servlet.ServletException"/>
/// <exception cref="System.IO.IOException"/>
protected override void DoGet(HttpServletRequest request, HttpServletResponse response
)
{
FileInputStream editFileIn = null;
try
{
ServletContext context = GetServletContext();
Configuration conf = (Configuration)GetServletContext().GetAttribute(JspHelper.CurrentConf
);
string journalId = request.GetParameter(JournalIdParam);
QuorumJournalManager.CheckJournalId(journalId);
JNStorage storage = JournalNodeHttpServer.GetJournalFromContext(context, journalId
).GetStorage();
// Check security
if (!CheckRequestorOrSendError(conf, request, response))
{
return;
}
// Check that the namespace info is correct
if (!CheckStorageInfoOrSendError(storage, request, response))
{
return;
}
long segmentTxId = ServletUtil.ParseLongParam(request, SegmentTxidParam);
FileJournalManager fjm = storage.GetJournalManager();
FilePath editFile;
lock (fjm)
{
// Synchronize on the FJM so that the file doesn't get finalized
// out from underneath us while we're in the process of opening
// it up.
FileJournalManager.EditLogFile elf = fjm.GetLogFile(segmentTxId);
if (elf == null)
{
response.SendError(HttpServletResponse.ScNotFound, "No edit log found starting at txid "
+ segmentTxId);
return;
}
editFile = elf.GetFile();
ImageServlet.SetVerificationHeadersForGet(response, editFile);
ImageServlet.SetFileNameHeaders(response, editFile);
editFileIn = new FileInputStream(editFile);
}
DataTransferThrottler throttler = ImageServlet.GetThrottler(conf);
// send edits
TransferFsImage.CopyFileToStream(response.GetOutputStream(), editFile, editFileIn
, throttler);
}
catch (Exception t)
{
string errMsg = "getedit failed. " + StringUtils.StringifyException(t);
response.SendError(HttpServletResponse.ScInternalServerError, errMsg);
throw new IOException(errMsg);
}
finally
{
IOUtils.CloseStream(editFileIn);
}
}
/// <summary>Start listening for edits via RPC.</summary>
/// <exception cref="System.IO.IOException"/>
public virtual void Start()
{
Preconditions.CheckState(!IsStarted(), "JN already running");
ValidateAndCreateJournalDir(localDir);
DefaultMetricsSystem.Initialize("JournalNode");
JvmMetrics.Create("JournalNode", conf.Get(DFSConfigKeys.DfsMetricsSessionIdKey),
DefaultMetricsSystem.Instance());
IPEndPoint socAddr = JournalNodeRpcServer.GetAddress(conf);
SecurityUtil.Login(conf, DFSConfigKeys.DfsJournalnodeKeytabFileKey, DFSConfigKeys
.DfsJournalnodeKerberosPrincipalKey, socAddr.GetHostName());
RegisterJNMXBean();
httpServer = new JournalNodeHttpServer(conf, this);
httpServer.Start();
httpServerURI = httpServer.GetServerURI().ToString();
rpcServer = new JournalNodeRpcServer(conf, this);
rpcServer.Start();
}