JLD2 when using parallel computing is not working [Julia 1.4.0-DEV]

[julien-vaes]

Hi all,

The issue I have is the following: when I run the following lines, which is the example given the documentation of JLD2, everything is fine:

using JLD2, FileIO
save("example.jld2", Dict("hello" => "world", "foo" => :bar))
load("example.jld2")

However, when using the Distributed package, i.e.

using Distributed
@everywhere using JLD2
@everywhere using FileIO
save("example.jld2", Dict("hello" => "world", "foo" => :bar))
load("example.jld2")

I have the following error, which arises when executing the last line:

MethodError: Cannot convert an object of type Type{Future} to an object of type Module
Closest candidates are:
  convert(::Type{T}, !Matched::T) where T at essentials.jl:170

Stacktrace:
 [1] handle_error(::MethodError, ::File{DataFormat{:JLD2}}) at /Users/jvaes/.julia/packages/FileIO/JAtC1/src/error_handling.jl:80
 [2] handle_exceptions(::Array{Any,1}, ::String) at /Users/jvaes/.julia/packages/FileIO/JAtC1/src/error_handling.jl:75
 [3] load(::File{DataFormat{:JLD2}}; options::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /Users/jvaes/.julia/packages/FileIO/JAtC1/src/loadsave.jl:193
 [4] load(::File{DataFormat{:JLD2}}) at /Users/jvaes/.julia/packages/FileIO/JAtC1/src/loadsave.jl:172
 [5] load(::String; options::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at /Users/jvaes/.julia/packages/FileIO/JAtC1/src/loadsave.jl:118
 [6] load(::String) at /Users/jvaes/.julia/packages/FileIO/JAtC1/src/loadsave.jl:118
 [7] top-level scope at In[1]:5

Thanks in advance for your help!

[GregPlowman]

I'm getting the same error.

using Distributed
using JLD2, FileIO
save("example.jld2", Dict("hello" => "world", "foo" => :bar))
load("example.jld2")

Errors on versions 0.1.4, 0.1.5, 0.1.6, 0.1.7.
Most recent error-free version is 0.1.3.

[DilumAluthge]

Can you try the da/future branch of JLD2 and see if that fixes it.

I.e.

] add JLD2#da/future

[GregPlowman]

Yes, that seems to fix it.
Thanks for your quick response!

[DilumAluthge]

Alright, I believe that this is now fixed in JLD2 version 0.1.8.

I am closing this issue.

If you encounter this bug again on JLD2 version 0.1.8 or greater, please comment on this issue and I will reopen it. Alternatively, you can open a new issue.