[ARROW-17373] [R] copying dataset and immediatly writing the copy to a different location fails

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 9.0.0
• Component/s: R
• Environment: Ubuntu 22.04
• External issue URL: https://github.com/apache/arrow/issues/32645

Language

R

• Assignee: Unassigned
• Reporter: Egill Axfjord Fridgeirsson
• Created: 10/Aug/22 11:05
• Updated: 11/Jan/23 11:50
• Resolved: 12/Dec/22 16:02

Description

When I copy large feather files, open a dataset from that file and immediately write that dataset to a new location I get the following error:

 

```Error: Invalid: Expected to read 144 metadata bytes but got 0```

 

I have made a reproducible example below:

 

``` r
df <- data.frame(replicate(1,sample(0:1,100e6,rep=TRUE)))
savePath <- file.path(tempdir(), 'arrowTest')
if (!dir.exists(savePath))

{   dir.create(savePath) }

arrow::write_feather(df, file.path(savePath, 'part-0.feather'))

copyPath <- file.path(tempdir(),'arrowTest')
if (!dir.exists(copyPath))

{   dir.create(copyPath) }

writePath <- file.path(tempdir(), 'arrowTest')
if (!dir.exists(writePath))

{   dir.create(writePath) }

arrow::copy_files(savePath, copyPath)

dataset <- arrow::open_dataset(copyPath, format='feather')
arrow::write_dataset(dataset = dataset, path = writePath, format = 'feather')
```

Issue Links

• is duplicated by: ARROW-17855 [R] Simultaneous read-write operations causing file corruption.