You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@arrow.apache.org by "Marco Neumann (JIRA)" <ji...@apache.org> on 2018/08/02 15:21:00 UTC
[jira] [Created] (ARROW-2963) [Python] Deadlock during fork-join
and use_threads=True
Marco Neumann created ARROW-2963:
------------------------------------
Summary: [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
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}})
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)