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https://issues.apache.org/jira/browse/SOLR-16191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17553327#comment-17553327
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ASF subversion and git services commented on SOLR-16191:
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Commit 97ff472bb29ec4acc7c35d5e95355f40434c4b43 in lucene-solr's branch
refs/heads/branch_8_11 from Mike Drob
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=97ff472bb29 ]
SOLR-16191: Fix backport issues
> Sanity-check assumptions about Linux `ps` command in `solr/bin/solr` script
> ---------------------------------------------------------------------------
>
> Key: SOLR-16191
> URL: https://issues.apache.org/jira/browse/SOLR-16191
> Project: Solr
> Issue Type: Improvement
> Components: scripts and tools
> Affects Versions: 9.0, 8.11.2, main (10.0)
> Reporter: Michael Gibney
> Assignee: Mike Drob
> Priority: Minor
> Fix For: 8.11.2, 9.1, main (10.0), 9.0.1
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> SOLR-15558 made more apparent some assumptions/implicit dependencies on the
> Linux {{ps}} command in the {{solr/bin/solr}} script. The script already
> [disables running in
> cygwin|https://github.com/apache/solr/blob/f5e927ed1ed9cb43ac843cac4e12b6edc1b8a904/solr/bin/solr#L58-L63]
> because of utility version incompatibility, but perhaps we could
> also/instead add "walks like a duck" sanity-check, e.g.:
> {code:sh}
> if [ "$$" != "`ps -o pid='' $$`" ]; then
> exit 1
> fi
> {code}
> The issue arose while running {{gradlew :solr:packaging:integrationTests}}
> for Alpine Linux with BusyBox {{ps}} installed, for which {{ps -o pid=''
> $WHATEVER}} dumps all running pids, regardless of the value of {{$WHATEVER}}.
> The behavior observed appeared mainly to affect {{solr stop}}, where the
> command watches for the PID to exit, but the pid is never detected as having
> exited. I'm not sure, it's possible that jstack/kill was being run against
> random PIDs!
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