internal virtual void AddReplicaIfNotPresent(DatanodeStorageInfo storage, Block block
, HdfsServerConstants.ReplicaState rState)
{
IEnumerator <BlockInfoContiguousUnderConstruction.ReplicaUnderConstruction> it = replicas
.GetEnumerator();
while (it.HasNext())
{
BlockInfoContiguousUnderConstruction.ReplicaUnderConstruction r = it.Next();
DatanodeStorageInfo expectedLocation = r.GetExpectedStorageLocation();
if (expectedLocation == storage)
{
// Record the gen stamp from the report
r.SetGenerationStamp(block.GetGenerationStamp());
return;
}
else
{
if (expectedLocation != null && expectedLocation.GetDatanodeDescriptor() == storage
.GetDatanodeDescriptor())
{
// The Datanode reported that the block is on a different storage
// than the one chosen by BlockPlacementPolicy. This can occur as
// we allow Datanodes to choose the target storage. Update our
// state by removing the stale entry and adding a new one.
it.Remove();
break;
}
}
}
replicas.AddItem(new BlockInfoContiguousUnderConstruction.ReplicaUnderConstruction
(block, storage, rState));
}
