Hadoop Distributed File System HDFS |
Google File System GFS |
Cross Platform |
Linux |
Developed in Java environment | Developed in c,c++ environment |
At first its developed by Yahoo and now its an open source Framework | Its developed by Google |
It has Name node and Data Node | It has Master-node and Chunk server |
128 MB will be the default block size | 64 MB will be the default block size |
Name node receive heartbeat from Data node | Master node receive heartbeat from Chunk server |
Commodities hardware were used | Commodities hardware werused |
WORM – Write Once and Read Many times | Multiple writer , multiple reader model |
Deleted files are renamed into particular folder and then it will removed via garbage | Deleted files are not reclaimed immediately and are renamed in hidden name space and it will deleted after three days if it’s not in use |
No Network stack issue | Network stack Issue |
Journal ,editlog | Oprational log |
only append is possible | random file write possible |