/**
* Remove the block from the block map; remove it from all data-node lists it belongs to; and
* remove all data-node locations associated with the block.
*/
void removeBlock(BlockInfo blockInfo) {
if (blockInfo == null) return;
blockInfo.inode = null;
for (int idx = blockInfo.numNodes() - 1; idx >= 0; idx--) {
DatanodeDescriptor dn = blockInfo.getDatanode(idx);
dn.removeBlock(blockInfo); // remove from the list and wipe the location
}
map.remove(blockInfo); // remove block from the map
System.out.println("BLOCKSMAP removes block : " + blockInfo);
}
/**
* Remove data-node reference from the block. Remove the block from the block map only if it does
* not belong to any file and data-nodes.
*/
boolean removeNode(Block b, DatanodeDescriptor node) {
BlockInfo info = map.get(b);
if (info == null) return false;
// remove block from the data-node list and the node from the block info
boolean removed = node.removeBlock(info);
if (info.getDatanode(0) == null // no datanodes left
&& info.inode == null) { // does not belong to a file
map.remove(b); // remove block from the map
System.out.println("BLOCKSMAP removes block : " + b);
}
return removed;
}
