public virtual DatanodeStorageInfo.AddBlockResult AddBlock(BlockInfoContiguous b)
{
// First check whether the block belongs to a different storage
// on the same DN.
DatanodeStorageInfo.AddBlockResult result = DatanodeStorageInfo.AddBlockResult.Added;
DatanodeStorageInfo otherStorage = b.FindStorageInfo(GetDatanodeDescriptor());
if (otherStorage != null)
{
if (otherStorage != this)
{
// The block belongs to a different storage. Remove it first.
otherStorage.RemoveBlock(b);
result = DatanodeStorageInfo.AddBlockResult.Replaced;
}
else
{
// The block is already associated with this storage.
return(DatanodeStorageInfo.AddBlockResult.AlreadyExist);
}
}
// add to the head of the data-node list
b.AddStorage(this);
blockList = b.ListInsert(blockList, this);
numBlocks++;
return(result);
}
/// <summary>Remove block from the list of blocks belonging to the data-node.</summary>
/// <remarks>
/// Remove block from the list of blocks belonging to the data-node. Remove
/// data-node from the block.
/// </remarks>
internal virtual bool RemoveBlock(string storageID, BlockInfoContiguous b)
{
DatanodeStorageInfo s = GetStorageInfo(storageID);
if (s != null)
{
return(s.RemoveBlock(b));
}
return(false);
}
/// <summary>Remove block from the list of blocks belonging to the data-node.</summary>
/// <remarks>
/// Remove block from the list of blocks belonging to the data-node. Remove
/// data-node from the block.
/// </remarks>
internal virtual bool RemoveBlock(BlockInfoContiguous b)
{
DatanodeStorageInfo s = b.FindStorageInfo(this);
// if block exists on this datanode
if (s != null)
{
return(s.RemoveBlock(b));
}
return(false);
}
