[jira] [Resolved] (ARROW-2963) [Python] Deadlock during fork-join and use_threads=True

["Wes McKinney (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-2963?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-2963.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 0.10.0

Issue resolved by pull request 2363
[https://github.com/apache/arrow/pull/2363]

> [Python] Deadlock during fork-join and use_threads=True
> -------------------------------------------------------
>
>                 Key: ARROW-2963
>                 URL: https://issues.apache.org/jira/browse/ARROW-2963
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 0.10.0
>         Environment: pandas==0.23.3
> pyarrow==0.10.0rc0
>            Reporter: Marco Neumann
>            Assignee: Antoine Pitrou
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.10.0
>
>          Time Spent: 1h 40m
>  Remaining Estimate: 0h
>
> The following code passes:
> {noformat}
> import os
> import pandas as pd
> import pyarrow as pa
> df = pd.DataFrame({'x': [1]})
> table = pa.Table.from_pandas(df)
> df = table.to_pandas(use_threads=False)
> pid = os.fork()
> if pid != 0:
>     os.waitpid(pid, 0)
> {noformat}
> but the following code will never finish (the {{waitpid}} calls blocks forever, seems that the child process is frozen):
> {noformat}
> import os
> import pandas as pd
> import pyarrow as pa
> df = pd.DataFrame({'x': [1]})
> table = pa.Table.from_pandas(df)
> df = table.to_pandas(use_threads=True)
> pid = os.fork()
> if pid != 0:
>     os.waitpid(pid, 0)
> {noformat}
> (the only difference is {{use_threads=True}})



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