/// <summary>
///
/// </summary>
/// <returns>true if deleted successfully</returns>
public bool Clear()
{
try
{
lock (m_requestLock)
{
string deploymentInfo = AzureRESTMgmtHelper.GetDeploymentInfo();
string svcconfig = AzureRESTMgmtHelper.GetServiceConfig(deploymentInfo);
string UpdatedSvcConfig;
UpdatedSvcConfig = AzureRESTMgmtHelper.ChangeInstanceCount(svcconfig, DocConstants.MERGER_NAME, DocConstants.InititalInstancesCount);
UpdatedSvcConfig = AzureRESTMgmtHelper.ChangeInstanceCount(UpdatedSvcConfig, DocConstants.WORKER_NAME, DocConstants.InititalInstancesCount);
AzureRESTMgmtHelper.ChangeConfigFile(UpdatedSvcConfig); //deallocating instances
m_scalePerforming = true;
m_instancesTimer.Enabled = true;
}
}
catch (Exception e)
{
m_log.Error("Error when deleting instances: " + e.Message);
return(false);
}
m_mergerCount = 1;
m_workerCount = 1;
m_mergerFreeCount = 1;
m_workerFreeCount = 1;
return(true);
}
InstanceManager(RenderLog log)
{
m_log = log;
m_log.Info("INSTANCE_MANAGER: Initializing instance manager");
m_requestLock = new Object();
//timer initialization
m_instancesTimer = new System.Timers.Timer(DocConstants.WAIT_AFTER_SCALE_REQUEST);
m_instancesTimer.Elapsed += new ElapsedEventHandler(scaleFinished);
m_instancesTimer.Enabled = false;
m_timer = new System.Timers.Timer(RenderUtils.DocConstants.INSTANCES_REMOVING_INTERVAL);
m_timer.Elapsed += new ElapsedEventHandler(timerElapsed);
m_timer.Enabled = true;
if (DocConstants.Get().ConnectionString != DocConstants.DEBUG_CONNECTION_STRING)
{
string deploymentInfo = AzureRESTMgmtHelper.GetDeploymentInfo();
string svcconfig = AzureRESTMgmtHelper.GetServiceConfig(deploymentInfo); //get azure config XML
Int32.TryParse(AzureRESTMgmtHelper.GetInstanceCount(svcconfig, DocConstants.WORKER_NAME), out m_workerCount); //get number of
if (m_workerCount <= 0)
{
m_log.Warning("INSTANCE_MANAGER: Azure returned worker instance number as: " + m_workerCount);
m_workerCount = 1;
}
else
{
m_log.Info("INSTANCE_MANAGER: initial worker count is: " + m_workerCount);
}
Int32.TryParse(AzureRESTMgmtHelper.GetInstanceCount(svcconfig, DocConstants.MERGER_NAME), out m_mergerCount);
if (m_mergerCount <= 0)
{
m_log.Warning("INSTANCE_MANAGER: Azure returned merger instance number as: " + m_workerCount);
m_mergerCount = 1;
}
else
{
m_log.Info("INSTANCE_MANAGER: initial merger count is: " + m_mergerCount);
}
m_workerFreeCount = m_workerCount;
m_mergerFreeCount = m_mergerCount;
}
m_scalePerforming = false;
}
/// <summary>
/// Send request to azure to allocate new worker and merger instances if needed
/// </summary>
/// <param name="workerRequestCount">Nunber of required worker instances</param>
/// <returns>true if operation was a success</returns>
public bool Require(int workerRequestCount)
{
if (DocConstants.Get().ConnectionString == DocConstants.DEBUG_CONNECTION_STRING)
{
return(true);
}
int workerBackupCount = m_workerCount;
int workerFreeBackupCount = m_workerFreeCount;
int mergerBackupCount = m_mergerCount;
try
{
lock (m_requestLock)
{
bool changeConf = false;
m_log.Info("INSTANCE_MANAGER: getting deployment info");
string deploymentInfo = AzureRESTMgmtHelper.GetDeploymentInfo();
string svcconfig = AzureRESTMgmtHelper.GetServiceConfig(deploymentInfo);
string UpdatedSvcConfig = svcconfig;
if (m_mergerFreeCount < 1)
{
//adding merger instance to config
++m_mergerCount;
m_log.Info("INSTANCE_MANAGER: requesting new merger. Now mergers count: " + m_mergerCount.ToString());
changeConf = true;
UpdatedSvcConfig = AzureRESTMgmtHelper.ChangeInstanceCount(svcconfig, DocConstants.MERGER_NAME, m_mergerCount.ToString());
}
else //there is at least one free merger
{
--m_mergerFreeCount;
}
if (m_workerFreeCount < workerRequestCount)
{
//adding new workers to config
int toAllocWorkerCount = workerRequestCount - m_workerFreeCount;
m_workerCount += toAllocWorkerCount;
m_workerFreeCount = 0;
m_log.Info("INSTANCE_MANAGER: requesting new workers. Now workers count: " + m_workerCount.ToString());
changeConf = true;
UpdatedSvcConfig = AzureRESTMgmtHelper.ChangeInstanceCount(UpdatedSvcConfig, DocConstants.WORKER_NAME, m_workerCount.ToString());
}
else
{
m_workerFreeCount -= workerRequestCount;
}
while (m_scalePerforming) //wait while last request is being performed
{
System.Threading.Thread.Sleep(10000);
continue;
}
if (changeConf)
{
m_scalePerforming = true;
AzureRESTMgmtHelper.ChangeConfigFile(UpdatedSvcConfig); //allocating instances
m_instancesTimer.Enabled = true;
m_log.Info("INSTANCE_MANAGER: Timer turned on. Waiting for allocation");
}
}
return(true);
}
catch (Exception e)
{
m_log.Error("INSTANCE_MANAGER: Error when allocating instances: " + e.Message + " Request was reversed.");
m_workerCount = workerBackupCount;
m_workerFreeCount = workerFreeBackupCount;
if (m_mergerCount != mergerBackupCount)
{
--m_mergerCount;
}
else
{
++m_mergerFreeCount;
}
return(false);
}
}
