Pytest emits a log and junit-style xml about tests executed, skipped, failed, etc. It's sometimes useful to check these artifacts after a run-all-tests.sh run, because the stdout/stderr console is so cluttered, or maybe you forgot to tee.
There is a bug in which the custom cluster test pytest metadata are ending up in the tests directory, not in the logs directory. The bug is escaped quotes in a shell script being taken literally. The logs are typically going to be in $IMPALA_HOME/tests/"/$IMPALA_HOME/logs/custom_cluster_tests/results/TEST-impala-custom-cluster.xml" instead.