/// <summary>
/// A new map is required when a member leaves or joins the cluster.
/// This method returns a new map based on the input paramameters.
/// </summary>
/// <param name="member">Address of the member that has either left
/// or joined the cluster</param>
/// <param name="isNew">A flag. True if the member has joined otherwise false.</param>
/// <returns>A new hashmap instance</returns>
public virtual DistributionMaps GetMaps(DistributionInfoData distInfoData)
{
ArrayList tmpMap = null;
Hashtable bucketsOwnershipMap = null;
ArrayList partitionNodes = new ArrayList();
_sync.AcquireWriterLock(Timeout.Infinite);
try
{
if (_installedHashMap == null)
{
tmpMap = new ArrayList(TotalBuckets);
for (int i = 0; i < TotalBuckets; i++)
{
HashMapBucket bucket = new HashMapBucket(distInfoData.AffectedNode.NodeAddress, i, BucketStatus.Functional);
tmpMap.Add(bucket);
}
_existingMembers.Add(distInfoData.AffectedNode.NodeAddress);
_lastCreatedHashMap = tmpMap.Clone() as ArrayList;
bucketsOwnershipMap = GetBucketsOwnershipMap(_lastCreatedHashMap);
return(new DistributionMaps(_lastCreatedHashMap, bucketsOwnershipMap));
}
else if (_lastCreatedHashMap == null)
{
_lastCreatedHashMap = _installedHashMap.Clone() as ArrayList;
}
switch (distInfoData.ClustActivity)
{
case ClusterActivity.NodeJoin:
try
{
return(GetMapsOnNodeJoining(distInfoData));
}
catch (Exception e)
{
if (NCacheLog.IsErrorEnabled)
{
NCacheLog.Error("DistributionMgr.GetMaps()", e.ToString());
}
break;
}
case ClusterActivity.NodeLeave:
try
{
return(GetMapsOnNodeLeaving(distInfoData));
}
catch (Exception e)
{
if (NCacheLog.IsErrorEnabled)
{
NCacheLog.Error("DistributionMgr.GetMaps()", e.ToString());
}
break;
}
case ClusterActivity.None:
BalanceNodeMgr bnMgr = new BalanceNodeMgr(null);
DistributionMaps result = bnMgr.BalanceNodes(distInfoData, _lastCreatedHashMap, _bucketsStats, _existingMembers);
if (result.Hashmap != null)
{
_lastCreatedHashMap = result.Hashmap.Clone() as ArrayList;
result.BucketsOwnershipMap = GetBucketsOwnershipMap(_lastCreatedHashMap);
}
return(result);
default:
break;
}
}
finally
{
_sync.ReleaseWriterLock();
}
return(null);
}
/// <summary>
/// A new map is required when a member leaves or joins the cluster.
/// This method returns a new map based on the input paramameters.
/// </summary>
/// <param name="member">Address of the member that has either left
/// or joined the cluster</param>
/// <param name="isNew">A flag. True if the member has joined otherwise false.</param>
/// <returns>A new hashmap instance</returns>
public virtual DistributionMaps GetMaps(DistributionInfoData distInfoData)
{
ArrayList tmpMap = null;
Hashtable bucketsOwnershipMap = null;
ArrayList partitionNodes = new ArrayList();
_sync.AcquireWriterLock(Timeout.Infinite);
try
{
if (_installedHashMap == null)
{
tmpMap = new ArrayList(TotalBuckets);
for (int i = 0; i < TotalBuckets; i++)
{
HashMapBucket bucket = new HashMapBucket(distInfoData.AffectedNode.NodeAddress, i, BucketStatus.Functional);
tmpMap.Add(bucket);
}
_existingMembers.Add(distInfoData.AffectedNode.NodeAddress);
_lastCreatedHashMap = tmpMap.Clone() as ArrayList;
bucketsOwnershipMap = GetBucketsOwnershipMap(_lastCreatedHashMap);
return new DistributionMaps(_lastCreatedHashMap, bucketsOwnershipMap);
}
else if (_lastCreatedHashMap == null)
{
_lastCreatedHashMap = _installedHashMap.Clone() as ArrayList;
}
switch (distInfoData.ClustActivity)
{
case ClusterActivity.NodeJoin:
try
{
return GetMapsOnNodeJoining(distInfoData);
}
catch (Exception e)
{
if (NCacheLog.IsErrorEnabled) NCacheLog.Error("DistributionMgr.GetMaps()", e.ToString());
break;
}
case ClusterActivity.NodeLeave:
try
{
return GetMapsOnNodeLeaving(distInfoData);
}
catch (Exception e)
{
if (NCacheLog.IsErrorEnabled) NCacheLog.Error("DistributionMgr.GetMaps()", e.ToString());
break;
}
case ClusterActivity.None:
BalanceNodeMgr bnMgr = new BalanceNodeMgr(null);
DistributionMaps result = bnMgr.BalanceNodes(distInfoData, _lastCreatedHashMap, _bucketsStats, _existingMembers);
if (result.Hashmap != null)
{
_lastCreatedHashMap = result.Hashmap.Clone() as ArrayList;
result.BucketsOwnershipMap = GetBucketsOwnershipMap(_lastCreatedHashMap);
}
return result;
default:
break;
}
}
finally
{
_sync.ReleaseWriterLock();
}
return null;
}
public override DistributionMaps GetMaps(DistributionInfoData distInfoData)
{
ArrayList tmpMap = null;
Hashtable bucketsOwnershipMap = null;
ArrayList partitionNodes = new ArrayList();
if (_installedHashMap == null)
{
tmpMap = new ArrayList(TotalBuckets);
for (int i = 0; i < TotalBuckets; i++)
{
HashMapBucket bucket = new HashMapBucket(distInfoData.AffectedNode.NodeAddress, i, BucketStatus.Functional);
tmpMap.Add(bucket);
}
_existingMembers.Add(distInfoData.AffectedNode.NodeAddress);
_subGroupMap[distInfoData.AffectedNode.NodeAddress] = distInfoData.AffectedNode.SubGroup;
//for each new group we are keeping list of members. For only Partition it will be one ..for POR can be greater then one.
//This is new member, the first one. So create the list here.
distInfoData.AffectedNode.IsCoordinator = true;
partitionNodes.Add(distInfoData.AffectedNode);
_partitionNodesInfo.Add(distInfoData.AffectedNode.SubGroup, partitionNodes); //A hash table keeping list of addresses against each GROUP/Partition.
_lastCreatedHashMap = tmpMap.Clone() as ArrayList;
bucketsOwnershipMap = GetBucketsOwnershipMap(_lastCreatedHashMap);
return(new DistributionMaps(_lastCreatedHashMap, bucketsOwnershipMap));
}
//for non-coordinator node that recently becomes coordinator...
else if (_lastCreatedHashMap == null)
{
_lastCreatedHashMap = _installedHashMap.Clone() as ArrayList;
}
switch (distInfoData.ClustActivity)
{
case ClusterActivity.NodeJoin:
try
{
//assuming existing members doesnot contain the newly added member.
if (!_partitionNodesInfo.ContainsKey(distInfoData.AffectedNode.SubGroup))
{
partitionNodes = new ArrayList();
distInfoData.AffectedNode.IsCoordinator = true;
partitionNodes.Add(distInfoData.AffectedNode);
_subGroupMap[distInfoData.AffectedNode.NodeAddress] = distInfoData.AffectedNode.SubGroup;
_partitionNodesInfo.Add(distInfoData.AffectedNode.SubGroup, partitionNodes); //A hash table keeping list of addresses against each GROUP/Partition.
if (NCacheLog.IsInfoEnabled)
{
NCacheLog.Info("DistributionMgr.GetMaps()", "Sending new map as a new node joined the cluster");
}
return(GetMapsOnNodeJoining(distInfoData));
}
else
{
partitionNodes = (ArrayList)_partitionNodesInfo[distInfoData.AffectedNode.SubGroup];
partitionNodes.Add(distInfoData.AffectedNode);
_subGroupMap[distInfoData.AffectedNode.NodeAddress] = distInfoData.AffectedNode.SubGroup;
return(new DistributionMaps(_lastCreatedHashMap, GetBucketsOwnershipMap(_lastCreatedHashMap)));
}
}
catch (Exception e)
{
if (NCacheLog.IsErrorEnabled)
{
NCacheLog.Error("DistributionMgr.GetMaps()", e.ToString());
}
break;
}
case ClusterActivity.NodeLeave:
//assuming existing members do not containt the node to be removed/left.
_existingMembers.Remove(distInfoData.AffectedNode.NodeAddress);
_subGroupMap.Remove(distInfoData.AffectedNode.NodeAddress);
//Check if this node is the only one in partition or not.So better do distribution
if (IsLastNodeInPartition(distInfoData.AffectedNode))
{
_partitionNodesInfo.Remove(distInfoData.AffectedNode.SubGroup);
return(GetMapsOnNodeLeaving(distInfoData));
}
else //this mean we still have nodes available for this partition.
{
ArrayList groupNodes = (ArrayList)_partitionNodesInfo[distInfoData.AffectedNode.SubGroup];
if (IsCoordinatorNodeInPartition(distInfoData.AffectedNode))
{
groupNodes.Remove((object)distInfoData.AffectedNode);
((PartNodeInfo)groupNodes[0]).IsCoordinator = true;
_partitionNodesInfo[distInfoData.AffectedNode.SubGroup] = groupNodes;
_existingMembers.Add(((PartNodeInfo)groupNodes[0]).NodeAddress);
tmpMap = UpgradeToCoordinatorOfReplica(distInfoData.AffectedNode.NodeAddress, ((PartNodeInfo)groupNodes[0]).NodeAddress);
_lastCreatedHashMap = tmpMap.Clone() as ArrayList;
bucketsOwnershipMap = GetBucketsOwnershipMap(_lastCreatedHashMap);
return(new DistributionMaps(_lastCreatedHashMap, bucketsOwnershipMap));
}
else
{
//simply remove the node and get a new bucket ownership map.
groupNodes.Remove(distInfoData.AffectedNode);
return(new DistributionMaps(_lastCreatedHashMap, GetBucketsOwnershipMap(_lastCreatedHashMap)));
}
}
case ClusterActivity.None:
BalanceNodeMgr bnMgr = new BalanceNodeMgr(null);
DistributionMaps result = bnMgr.BalanceNodes(distInfoData, _lastCreatedHashMap, _bucketsStats, _existingMembers);
if (result.Hashmap != null)
{
_lastCreatedHashMap = result.Hashmap.Clone() as ArrayList;
result.BucketsOwnershipMap = GetBucketsOwnershipMap(_lastCreatedHashMap);
}
return(result);
default:
break;
}
return(null);
}
