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Multi-worker-docker-container: disable log buffering #16919

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merged 1 commit into from
Mar 13, 2024
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Multi-worker-docker-container: disable log buffering #16919

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1 change: 1 addition & 0 deletions changelog.d/16919.misc
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Multi-worker-docker-container: disable log buffering.
7 changes: 5 additions & 2 deletions docker/prefix-log
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Expand Up @@ -7,6 +7,9 @@
# prefix-log command [args...]
#

exec 1> >(awk '{print "'"${SUPERVISOR_PROCESS_NAME}"' | "$0}' >&1)
exec 2> >(awk '{print "'"${SUPERVISOR_PROCESS_NAME}"' | "$0}' >&2)
# '-W interactive' is a `mawk` extension which disables buffering on stdout and sets line-buffered reads on
# stdin. The effect is that the output is flushed after each line, rather than being batched, which helps reduce
# confusion due to to interleaving of the different processes.
exec 1> >(awk -W interactive '{print "'"${SUPERVISOR_PROCESS_NAME}"' | "$0 }' >&1)
exec 2> >(awk -W interactive '{print "'"${SUPERVISOR_PROCESS_NAME}"' | "$0 }' >&2)
exec "$@"
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