public async Task <WriteShardDataResponse> WriteShardData(ShardData data, ShardOperationOptions operationType, string operationId, DateTime transactionDate)
{
ShardWriteOperation operation = new ShardWriteOperation()
{
Data = data,
Id = operationId,
Operation = operationType,
TransactionDate = transactionDate
};
ShardWriteOperation lastOperation = await GetOrPopulateOperationCache(operation.Data.ShardId.Value);
//Start at 1
operation.Pos = lastOperation == null ? 1 : lastOperation.Pos + 1;
var hash = lastOperation == null ? "" : lastOperation.ShardHash;
operation.ShardHash = ObjectUtility.HashStrings(hash, operation.Id);
_logger.LogDebug(_nodeStateService.GetNodeLogId() + "writing new operation " + operationId + " with data " + Environment.NewLine + JsonConvert.SerializeObject(data, Formatting.Indented));
//Write the data
var writeOperation = await _shardRepository.AddShardWriteOperationAsync(operation); //Add shard operation
if (writeOperation)
{
ApplyOperationToDatastore(operation);
var shardMetadata = _stateMachine.GetShard(operation.Data.ShardType, operation.Data.ShardId.Value);
//Mark operation as applied
await _shardRepository.MarkShardWriteOperationAppliedAsync(operation.Id);
//Update the cache
UpdateOperationCache(operation.Data.ShardId.Value, operation);
ConcurrentBag <Guid> InvalidNodes = new ConcurrentBag <Guid>();
//All allocations except for your own
var tasks = shardMetadata.InsyncAllocations.Where(id => id != _nodeStateService.Id).Select(async allocation =>
{
try
{
var result = await _clusterClient.Send(allocation, new ReplicateShardWriteOperation()
{
Operation = operation
});
if (result.IsSuccessful)
{
_logger.LogDebug(_nodeStateService.GetNodeLogId() + "Successfully replicated all " + shardMetadata.Id + "shards.");
}
else
{
throw new Exception("Failed to replicate data to shard " + shardMetadata.Id + " to node " + allocation + " for operation " + operation.ToString() + Environment.NewLine + JsonConvert.SerializeObject(operation, Formatting.Indented));
}
}
catch (TaskCanceledException e)
{
_logger.LogError(_nodeStateService.GetNodeLogId() + "Failed to replicate shard " + shardMetadata.Id + " on node " + allocation + " for operation " + operation.Pos + " as request timed out, marking shard as not insync...");
InvalidNodes.Add(allocation);
}
catch (Exception e)
{
_logger.LogError(_nodeStateService.GetNodeLogId() + "Failed to replicate shard " + shardMetadata.Id + " for operation " + operation.Pos + " with error " + e.Message + ", marking shard as not insync..." + Environment.NewLine + e.StackTrace);
InvalidNodes.Add(allocation);
}
});
await Task.WhenAll(tasks);
if (InvalidNodes.Count() > 0)
{
await _clusterClient.Send(new ExecuteCommands()
{
Commands = new List <BaseCommand>()
{
new UpdateShardMetadataAllocations()
{
ShardId = data.ShardId.Value,
Type = data.ShardType,
StaleAllocationsToAdd = InvalidNodes.ToHashSet(),
InsyncAllocationsToRemove = InvalidNodes.ToHashSet()
}
},
WaitForCommits = true
});
_logger.LogInformation(_nodeStateService.GetNodeLogId() + " had stale virtual machines.");
}
return(new WriteShardDataResponse()
{
Pos = operation.Pos,
ShardHash = operation.ShardHash,
IsSuccessful = true
});
}
else
{
return(new WriteShardDataResponse()
{
IsSuccessful = false
});
}
}
public async Task <List <ShardWriteOperation> > GetShardWriteOperationsAsync(Guid shardId, ShardOperationOptions option, int limit)
{
return(await _shardWriteOperations.Find(lsm => lsm.Operation == option && lsm.Data.ShardId == shardId).SortBy(l => l.TransactionDate).Limit(limit).ToListAsync());
}