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Posted to jira@arrow.apache.org by "Claymore Marshall (Jira)" <ji...@apache.org> on 2021/02/10 01:39:00 UTC
[jira] [Updated] (ARROW-11579) R's arrow::read_feather hanging on
repeat reads of large objects
[ https://issues.apache.org/jira/browse/ARROW-11579?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Claymore Marshall updated ARROW-11579:
--------------------------------------
Description:
On windows 10, reading large feather objects in R seems to lead to hanging on a repeat read.
This issue has been reproduced on 3 different windows machines. All running win 10, R 4.0.0 (or later).
read_feather does not hang if using version = 1, or using uncompressed with version 2.
This issue does not happen on tests on linux (Ubuntu 20.04 atleast)
Example:
_library(arrow)_
_m <- data.frame(x = rnorm(7e6), y = rnorm(5), b = rnorm(5), n = rnorm(5), c = c("a", "n"))_
_write_feather(m, "test.feather4", version = 2, compression = "lz4") # does not hang with uncompressed, but does with lz4 and zstd_
_for (j in 1:50)_
_{ y <- read_feather("test.feather4") # hangs after an unpredictable number of reads, just on windows though print(paste0("feather read ", j, "...")) }_
Interestingly, a work around is to use read_feather but call just one column at a time. This does not hang so far.
e.g. y returns the full data frame, and this doesn't hang on repeated reads:
_y <- lapply(cols, function(col) {_
_read_feather(..., col_select = all_of(col))_
_})_
was:
On windows 10, reading large feather objects in R seems to lead to hanging on a repeat read.
This issue has been reproduced on 3 different windows machines. All running win 10, R 4.0.0 (or later).
read_feather does not hang if using version = 1, or using uncompressed with version 2.
This issue does not happen on tests on linux (Ubuntu 20.04 atleast)
Example:
library(arrow)
m <- data.frame(x = rnorm(7e6), y = rnorm(5), b = rnorm(5), n = rnorm(5), c = c("a", "n"))
write_feather(m, "test.feather4", version = 2, compression = "lz4") # does not hang with uncompressed, but does with lz4 and zstd
for (j in 1:50) {
y <- read_feather("test.feather4") # hangs after an unpredictable number of reads, just on windows though
print(paste0("feather read ", j, "..."))
}
> R's arrow::read_feather hanging on repeat reads of large objects
> ----------------------------------------------------------------
>
> Key: ARROW-11579
> URL: https://issues.apache.org/jira/browse/ARROW-11579
> Project: Apache Arrow
> Issue Type: Bug
> Components: R
> Affects Versions: 3.0.0
> Environment: windows 10, R 4.0.0, arrow 3.0.0
> Reporter: Claymore Marshall
> Priority: Major
>
> On windows 10, reading large feather objects in R seems to lead to hanging on a repeat read.
>
> This issue has been reproduced on 3 different windows machines. All running win 10, R 4.0.0 (or later).
> read_feather does not hang if using version = 1, or using uncompressed with version 2.
> This issue does not happen on tests on linux (Ubuntu 20.04 atleast)
>
> Example:
>
> _library(arrow)_
> _m <- data.frame(x = rnorm(7e6), y = rnorm(5), b = rnorm(5), n = rnorm(5), c = c("a", "n"))_
> _write_feather(m, "test.feather4", version = 2, compression = "lz4") # does not hang with uncompressed, but does with lz4 and zstd_
> _for (j in 1:50)_
> _{ y <- read_feather("test.feather4") # hangs after an unpredictable number of reads, just on windows though print(paste0("feather read ", j, "...")) }_
>
>
>
>
> Interestingly, a work around is to use read_feather but call just one column at a time. This does not hang so far.
>
> e.g. y returns the full data frame, and this doesn't hang on repeated reads:
>
> _y <- lapply(cols, function(col) {_
> _read_feather(..., col_select = all_of(col))_
> _})_
>
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