Pfs_nn_dnadmin
/* $Id: pfs_nn_dnadmin.x 488 2011-10-25 21:29:23Z gerd $ -*- c -*- */
Dn_admin
Administration of datanodes
#include "pfs_types.x"
#ifndef PFS_NN_DNADMIN
#define PFS_NN_DNADMIN
program Dn_admin {
version V1 {
null
void null(void) = 0;
add_datanode
void add_datanode(longstring, hyper) = 1;
add_datanode(identity, size):
adds a new datanode. It is in disabled state initially
enable_datanode
void enable_datanode(longstring, longstring) = 2;
enable_datanode(identity, hostport): Enables the data node for
identity on hostport.
disable_datanode
void disable_datanode(longstring) = 3;
disable_datanode(identity):
This means blocks are no longer allocated on the node, and
if blocks from this node are reported as non-alive by
get_blocks. This datanode state is considered temporary
(e.g. while moving a disk from one node to another).
The coordinator pings the datanodes anyway, and finds quickly out whether nodes are down. This RPC is more useful for administratively taking nodes down, e.g. for maintenance.
is_enabled
bool is_enabled(longstring) = 4;whether this identity is enabled
is_alive
bool is_alive(longstring) = 8;whether this identity is alive
fsstat
fsstat fsstat(longstring) = 9;return the block statistics for this datanode. Fills only
total_blocks, used_blocks, and trans_blocks.
lookup
longstring lookup(longstring) = 5;looks the identity up and returns hostport. Only for enabled nodes that could be at least contacted once. The node may be unresponsive now, though.
Returns the empty string if the identity is known, but no address is associated with it, or if the node is disabled.
Fails if the identity is unknown.
datanodes
longstrings datanodes(void) = 6;Returns the identities of all datanodes
destroy_datanode
void destroy_datanode(longstring) = 7;
destroy_datanode(identity):
This removes all information about this datanode from the namenode database.
} = 1;
} = 0x8000e003;
#endif
