Kertish DFS Data Node

Data node is responsible to store file blocks and serve then they requested. Default bind endpoint port is :9430

Should be started with parameters that are set as environment variables

Environment Variables

• BIND_ADDRESS (optional) : Service binding address. Ex: 127.0.0.1:9430 Default: :9430

• MANAGER_ADDRESS (mandatory) : Manager Node accessing endpoint. Ex: http://127.0.0.1:9400

Manager address will be used to create the data node mapping, reservation, discard and commit operations of file/folder placement.

• SIZE (mandatory) : The size limit of the node. All the data nodes should be the same size if they'll be used in the same cluster. Size value should be uint64. Ex: 1073741824

• ROOT_PATH (optional) : The path to store file blocks. Default: /opt

• CACHE_LIMIT (optional): Small sized files can be cached for fast access. Value should be uint64 in byte format Default: 0 (disabled)

• CACHE_LIFETIME (optional): Cache lifetime. When it reaches to the limit, garbage collector will free up the memory. Value should be uint64 in minutes. Default: 360 (6 hours)

Data Node

Data nodes are smart enough to sync each other. Every create and delete request will be distributed between nodes using the manager as a gateway. On the first run, if manager node is not accessible, it will start as stand-alone. When manager node becomes available, they will automatically join the related cluster.