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Disk I/o Error Windows 7
0 Pulse Graphs New issue IO error reading multiple Feather files
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in R #177 Closed lmullen opened this Issue Jun 3, 2016 · 6 comments Projects None yet disk i/o error replace the disk Labels None yet Milestone No milestone Assignees No one assigned 3 participants lmullen commented Jun 3, 2016 I have 18,500 Feather files (all with the same columns https://groups.google.com/d/topic/mitappinventortest/3Xa3C2FeNrA and column types) which I want to read in. So I do this: library(feather) library(purrr) library(dplyr) paths <- Sys.glob("/media/lmullen/data/chronicling-america/out/*.feather") read_df <- failwith(NA, function(x) { message(x) read_feather(x) }) raw_l <- paths %>% map(read_df) names(raw_l) <- paths When I run that code, some number of the Feather files (it varies from about 150 to 1500) fail to load with this error. https://github.com/wesm/feather/issues/177 /media/lmullen/data/chronicling-america/out/sn85042907-1919.feather Error : IO error: Unable to open file There is nothing actually wrong with those Feather files though. I can read_feather(path_to_problem_file) and get back a data frame as expected. I can also get the paths which failed to load, then run map(paths_that_didnt_load, read_feather) and load all of them fine. My only suspicion is that Feather is too fast---that it reads the files so quickly that the disk can't get to the next file in time. FWIW, the files that don't load in the batch tend to come in sequence. The files are stored on a RAID 10 array, so it's not as fast as an SSD, but it's fast. When I put a Sys.sleep(1) call in between loading each file, that cuts down on the number of errors. I can't think of a good way to provide a reproducible example, but happy to do so if you can give instructions. > sessionInfo() R version 3.3.0 (2016-05-03) Platform: x86_64-pc-linux-gnu (64-bit) Running under: Ubuntu 16.04 LTS locale: [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 [5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 LC_PAPER=en
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