Replace CLUSTER SLOTS with CLUSTER NODES to get slot map

[maralla]

No description provided.

[jasonjoo2010]

hi, maralla

why we considered to replace it?

the output of slots command is structured while nodes' is unsure and is mainly for reading i think.
if the slots is fully distributed it is not sure whether nodes command is reliable.

eg.:
master - 0 1464406084408 14 connected 1,3,4,5,6,8192-12287,13223

is it for network transfer reasons?

[maralla]

CLUSTER SLOTS is much slower than CLUSTER NODES in large clusters with many discrete slots.

[jasonjoo2010]

yeah got it
it is suggested add fully test case which has many seperated slots associated.

[wooparadog]

@jasonjoo2010 Another user has reported that because redis 3.2.0 changed the return value of cluster slots, corvus@0.2.3 is not able to update its slot information. So using cluster nodes fixed that as a bonus...