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https://issues.apache.org/jira/browse/SPARK-53149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yang Jie reassigned SPARK-53149:
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Assignee: Cheng Pan
> Fix testing whether BeeLine process run in background
> -----------------------------------------------------
>
> Key: SPARK-53149
> URL: https://issues.apache.org/jira/browse/SPARK-53149
> Project: Spark
> Issue Type: Bug
> Components: Windows
> Affects Versions: 3.5.6, 4.0.0
> Reporter: Phil Walker
> Assignee: Cheng Pan
> Priority: Minor
> Labels: pull-request-available
> Fix For: 4.1.0, 4.0.2, 3.5.8
>
>
> script `bin/load-spark-env.sh` tests for whether running in foreground or
> background by calling `ps -o stat=` and checking output for `+`. When
> running in a windows shell environment, this results in an error message to
> `stdout`. This is because the `ps.exe` tool in these environments doesn't
> support the `ps -o stat= -p $$` expression.
>
> AFAIK, there is no equivalent expression in any of these environments (MSYS2,
> cygwin64, Git-for-Windows). However, the error message can be suppressed by
> redirecting `stderr` to /dev/null, reducing the negative impact.
>
> Currently, the last section of `bin/load-spark-env.sh` looks like this:
> ```
> if [[ ( ! $(ps -o stat= -p $$) =~ "+" ) && ! ( -p /dev/stdin ) ]]; then
> export SPARK_BEELINE_OPTS="$SPARK_BEELINE_OPTS
> -Djline.terminal=jline.UnsupportedTerminal"
> fi
> ```
> The following variation would eliminate the error message:
> ```
> if [[ ( ! $(ps -o stat= -p $$ 2>/dev/null) =~ "+" ) && ! ( -p /dev/stdin )
> ]]; then
> export SPARK_BEELINE_OPTS="$SPARK_BEELINE_OPTS
> -Djline.terminal=jline.UnsupportedTerminal"
> fi
> ```
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