/*
* GetPlacementConnection establishes a connection for a placement.
*
* See StartPlacementConnection for details.
*/
MultiConnection *
GetPlacementConnection(uint32 flags, ShardPlacement *placement, const char *userName)
{
MultiConnection *connection = StartPlacementConnection(flags, placement, userName);
FinishConnectionEstablishment(connection);
return connection;
}
/*
* OpenTransactionsToAllShardPlacements opens connections to all placements
* using the provided shard identifier list and returns it as a shard ID ->
* ShardConnections hash. connectionFlags can be used to specify whether
* the command is FOR_DML or FOR_DDL.
*/
HTAB *
OpenTransactionsToAllShardPlacements(List *shardIntervalList, int connectionFlags)
{
HTAB *shardConnectionHash = NULL;
ListCell *shardIntervalCell = NULL;
List *newConnectionList = NIL;
shardConnectionHash = CreateShardConnectionHash(CurrentMemoryContext);
/* open connections to shards which don't have connections yet */
foreach(shardIntervalCell, shardIntervalList)
{
ShardInterval *shardInterval = (ShardInterval *) lfirst(shardIntervalCell);
uint64 shardId = shardInterval->shardId;
ShardConnections *shardConnections = NULL;
bool shardConnectionsFound = false;
List *shardPlacementList = NIL;
ListCell *placementCell = NULL;
shardConnections = GetShardHashConnections(shardConnectionHash, shardId,
&shardConnectionsFound);
if (shardConnectionsFound)
{
continue;
}
shardPlacementList = FinalizedShardPlacementList(shardId);
if (shardPlacementList == NIL)
{
/* going to have to have some placements to do any work */
ereport(ERROR, (errmsg("could not find any shard placements for the shard "
UINT64_FORMAT, shardId)));
}
foreach(placementCell, shardPlacementList)
{
ShardPlacement *shardPlacement = (ShardPlacement *) lfirst(placementCell);
MultiConnection *connection = NULL;
WorkerNode *workerNode = FindWorkerNode(shardPlacement->nodeName,
shardPlacement->nodePort);
if (workerNode == NULL)
{
ereport(ERROR, (errmsg("could not find worker node %s:%d",
shardPlacement->nodeName,
shardPlacement->nodePort)));
}
connection = StartPlacementConnection(connectionFlags,
shardPlacement,
NULL);
ClaimConnectionExclusively(connection);
shardConnections->connectionList = lappend(shardConnections->connectionList,
connection);
newConnectionList = lappend(newConnectionList, connection);
/*
* Every individual failure should cause entire distributed
* transaction to fail.
*/
MarkRemoteTransactionCritical(connection);
}