private IOperationResult ExecuteWithRedirect(IMemcachedNode startNode, ISingleItemOperation op)
{
IOperationResult result = startNode.Execute(op);
if (!result.Success)
{
IOperationWithState state = op as IOperationWithState;
if (state == null)
{
return(result);
}
if (state.State != OperationState.InvalidVBucket)
{
return(result);
}
foreach (IMemcachedNode node in base.Pool.GetWorkingNodes())
{
result = node.Execute(op);
if (result.Success)
{
return(result);
}
if (state.State != OperationState.InvalidVBucket)
{
return(result);
}
}
}
return(result);
}
/// <summary>
/// Finds the version of Memcached the Elasticache setup is running on
/// </summary>
/// <returns>Version of memcahced running on nodes</returns>
internal Version GetNodeVersion()
{
if (NodeVersion != null)
{
return(NodeVersion);
}
#if DEBUG // For LocalSimulationTester
if (!string.IsNullOrEmpty(_node.ToString()) && _node.ToString().Equals("TestingAWSInternal"))
{
NodeVersion = new Version("1.4.14");
return(NodeVersion);
}
#endif
IStatsOperation statCommand = new StatsOperation(null);
/* var statResult = */ _node.Execute(statCommand);
if (statCommand.Result != null && statCommand.Result.TryGetValue("version", out var version))
{
NodeVersion = new Version(version);
return(NodeVersion);
}
_log.LogError("Could not call stats on Node endpoint");
throw new CommandNotSupportedException("The node does not have a version in stats.");
}
private bool ExecuteWithRedirect(IMemcachedNode startNode, ISingleItemOperation op)
{
if (startNode.Execute(op))
{
return(true);
}
var iows = op as IOperationWithState;
// different op factory, we do not know how to retry
if (iows == null)
{
return(false);
}
#if HAS_FORWARD_MAP
// node responded with invalid vbucket
// this should happen only when a node is in a transitioning state
if (iows.State == OpState.InvalidVBucket)
{
// check if we have a forward-locator
// (whihc supposedly reflects the state of the cluster when all vbuckets have been migrated succesfully)
IMemcachedNodeLocator fl = this.nsPool.ForwardLocator;
if (fl != null)
{
var nextNode = fl.Locate(op.Key);
if (nextNode != null)
{
// the node accepted the requesta
if (nextNode.Execute(op))
{
return(true);
}
}
}
}
#endif
// still invalid vbucket, try all nodes in sequence
if (iows.State == OperationState.InvalidVBucket)
{
var nodes = this.Pool.GetWorkingNodes();
foreach (var node in nodes)
{
if (node.Execute(op))
{
return(true);
}
// the node accepted our request so quit
if (iows.State != OperationState.InvalidVBucket)
{
break;
}
}
}
return(false);
}
private bool ExecuteWithRedirect(IMemcachedNode startNode, ISingleItemOperation op)
{
if (startNode.Execute(op)) return true;
var iows = op as IOperationWithState;
// different op factory, we do not know how to retry
if (iows == null)
return false;
#if HAS_FORWARD_MAP
// node responded with invalid vbucket
// this should happen only when a node is in a transitioning state
if (iows.State == OpState.InvalidVBucket)
{
// check if we have a forward-locator
// (whihc supposedly reflects the state of the cluster when all vbuckets have been migrated succesfully)
IMemcachedNodeLocator fl = this.nsPool.ForwardLocator;
if (fl != null)
{
var nextNode = fl.Locate(op.Key);
if (nextNode != null)
{
// the node accepted the requesta
if (nextNode.Execute(op)) return true;
}
}
}
#endif
// still invalid vbucket, try all nodes in sequence
if (iows.State == OperationState.InvalidVBucket)
{
var nodes = this.Pool.GetWorkingNodes();
foreach (var node in nodes)
{
if (node.Execute(op))
return true;
// the node accepted our request so quit
if (iows.State != OperationState.InvalidVBucket)
break;
}
}
return false;
}
