public BlockInfoUnderConstruction[] getLeaseRecoveryCommand(int maxTransfers) {
List<BlockInfoUnderConstruction> blocks = recoverBlocks.poll(maxTransfers);
if (blocks == null) return null;
return blocks.toArray(new BlockInfoUnderConstruction[blocks.size()]);
}
public List<BlockTargetPair> getReplicationCommand(int maxTransfers) {
return replicateBlocks.poll(maxTransfers);
}