Open
Description
I've bumped into this behavior by accident after defining hash
incorrectly for arrays. I'm absolutely not sure it indicates a bug, but I figured I'd better report it since this kind of exceptional situation is rarely tested.
It appears that when hash collisions happen, remotecall_fetch
is not able to detect that the contents of an array have been updated. This can easily be reproduced by always returning the same hash for all arrays. This is surprising to me, as I would have expected that differing hashes are sufficient, but not necessary, to consider that two arrays are different, i.e. that isequal
would always be called to check for hash collisions.
julia> using Distributed
julia> Base.hash(::AbstractArray, ::UInt) = zero(UInt)
julia> x = [1]
1-element Array{Int64,1}:
1
julia> remotecall_fetch(()->x, 2)
1-element Array{Int64,1}:
1
julia> x[1] = 2
2
julia> remotecall_fetch(()->x, 2) # Woops, not updated
1-element Array{Int64,1}:
1
Metadata
Metadata
Assignees
Labels
No labels