AppendTestUtil.sleep(5000);
//check block sizes
final long len = fs.getFileStatus(pnew).getLen();
final LocatedBlocksWithMetaInfo locatedblocks = fs.dfs.namenode.openAndFetchMetaInfo(pnew.toString(), 0L, len);
final int numblock = locatedblocks.locatedBlockCount();
for(int i = 0; i < numblock; i++) {
final LocatedBlock lb = locatedblocks.get(i);
final Block blk = lb.getBlock();
final long size = lb.getBlockSize();
if (i < numblock - 1) {