potiuk edited a comment on pull request #15939:
URL: https://github.com/apache/airflow/pull/15939#issuecomment-848936369
Just change (in `_parallel.sh`):
```
status=$(cat "${PARALLEL_MONITORED_DIR}/${SEMAPHORE_NAME}/${job}/status")
```
into
```
status=$(cat "${PARALLEL_MONITORED_DIR}/${SEMAPHORE_NAME}/${job}/status" ||
true)
```
Lack of "true" there, masks the root cause. Simply the actual error is not
printed to the output because this line fails. When we add `|| true`, the cat
command will not fail and few lines below content of the output will be
written, and this should reveal the actual problem that is causing the command
to fail.
```
status=$(cat
"${PARALLEL_MONITORED_DIR}/${SEMAPHORE_NAME}/${job}/status")
if [[ ${status} == "0" ]]; then
parallel::output_log_for_successful_job "${job}"
else
parallel::output_log_for_failed_job "${job}" <- THIS LINE
SHOULD PRINT THE ROOT CAUSE OF THE PROBLEM
# SKIPPED_FAILED_JOB failure does not trigger whole test failure
if [[ ${SKIPPED_FAILED_JOB=} != "${job}" ]]; then
return_code=$((return_code + 1))
fi
fi
```
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