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| learn:bigdata:name_node [2014/08/07 16:31] – yehuda | learn:bigdata:name_node [2022/01/03 16:03] (current) – external edit 127.0.0.1 | ||
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| ====== Name node ====== | ====== Name node ====== | ||
| - | | + | see also [[Secondary name node]] |
| - | * Controlls DataNodes | + | * :!: MOST IMPORATANT FOR CLUSTER! |
| - | * FS Ops | + | |
| - | * Block Mapping | + | * Controlls DataNodes |
| + | * FS Ops | ||
| + | * Block Mapping | ||
| + | * Send cordinates to clients where to get the [[Data blocks]] and witch [[Data node]] | ||
| + | * [[Name node]] retrives every __3 secounds__ heart-bit from [[Data node]] | ||
| + | * If [[Name node]] not retrives from the [[Data node]] heart-bit more then __10 minutes__ [[Name node]] will consedure the [[Data node]] as a [[Dead node]] and the [[Name node]] start to replicate all [[Data blocks]] that has on a [[Dead node]] to other nodes | ||
| + | ===== Requriements ===== | ||
| + | * Should have LOT OF RAM, LOT OF MEM, LOT OF POWER | ||
| + | |||
| + | ===== Structure ===== | ||
| + | * RAM | ||
| + | * [[Edit log]] | ||
| + | * [[fsImage]] | ||
| + | * FILE | ||
| + | * [[fsImage]] | ||
| + | |||
| + | When proccess of Reboot or [[Checkpoint]] the [[fsImage|RAM\fsImage]] marges with [[Edit log]] to [[fsImage|FILE\fsImage]] file that makes it to keep presistnece. | ||
