# DistributedArray operation fails
**URL:** https://discourse.julialang.org/t/distributedarray-operation-fails/26177
**Category:** Julia at Scale
**Created:** [July 9, 2019, 8:20am UTC](https://discourse.julialang.org/t/distributedarray-operation-fails/26177 "2019-07-09T08:20:32Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@monty](https://discourse.julialang.org/u/monty)
#### Post date: [July 9, 2019, 8:20am UTC](https://discourse.julialang.org/t/distributedarray-operation-fails/26177/1 "2019-07-09T08:20:32Z")
```julia
da = DistributedArrays.distribute(rand(10,10))
da' * da
```
works. However,
```julia
da * da'
```
fails. Any suggestions why and how it can be fixed? Thank you very much!
---
### Author:  [@nilshg](https://discourse.julialang.org/u/nilshg)
#### Post date: [July 9, 2019, 9:13am UTC](https://discourse.julialang.org/t/distributedarray-operation-fails/26177/2 "2019-07-09T09:13:56Z")
Not sure what’s going on, maybe you can investigate by looking at:
```julia
julia> @which da' * da
*(adjA::LinearAlgebra.Adjoint{#s125,#s124} where #s124<:(DArray{T,2,A} where A where T) where #s125, B::AbstractArray{T,2} where T) in DistributedArrays at C:\Users\####\.julia\packages\DistributedArrays\h240R\src\linalg.jl:292
julia> @which da * da'
*(A::DArray{T,2,A} where A where T, B::AbstractArray{T,2} where T) in DistributedArrays at C:\Users\####\.julia\packages\DistributedArrays\h240R\src\linalg.jl:274
```
---
### Author:  [@monty](https://discourse.julialang.org/u/monty)
#### Post date: [July 11, 2019, 7:31am UTC](https://discourse.julialang.org/t/distributedarray-operation-fails/26177/3 "2019-07-11T07:31:39Z")
Thank you very much for the suggestion but this did not help much. I am still not sure what is going on. Maybe it is a bug.
---
### Author:  [@nilshg](https://discourse.julialang.org/u/nilshg)
#### Post date: [July 11, 2019, 8:24am UTC](https://discourse.julialang.org/t/distributedarray-operation-fails/26177/4 "2019-07-11T08:24:27Z")
Looks to me like a missing method somewhere, but I don’t know enough about how DistributedArrays work - maybe one of the devs can chime in here, alternatively try opening an issue.