try { final Iterator<BlockInfo> it = blockManager.getCorruptReplicaBlockIterator();
final Iterator<Block> blkIterator = blockManager.getCorruptReplicaBlockIterator();
final Iterator<Block> blkIterator = blockManager.getCorruptReplicaBlockIterator();
writeLock(); try { final Iterator<Block> it = blockManager.getCorruptReplicaBlockIterator();
writeLock(); try { final Iterator<Block> it = blockManager.getCorruptReplicaBlockIterator();