[FLINK-18217][conf] Explicitly check for empty string

* [FLINK-18217][conf] Explicitly check for empty string * + * ++
deepfield · Jun 11, 2020 · 6216906 · 6216906
1 parent 0b0a6bc
commit 6216906
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/flink-dist/src/main/flink-bin/bin/config.sh b/flink-dist/src/main/flink-bin/bin/config.sh
@@ -524,6 +524,11 @@ extractExecutionResults() {
 
  execution_results=$(echo "${output}" | grep ${EXECUTION_PREFIX})
  num_lines=$(echo "${execution_results}" | wc -l)
+ # explicit check for empty result, becuase if execution_results is empty, then wc returns 1
+ if [[ -z ${execution_results} ]]; then
+ echo "[ERROR] The execution result is empty." 1>&2
+ exit 1
+ fi
  if [[ ${num_lines} -ne ${expected_lines} ]]; then
  echo "[ERROR] The execution results has unexpected number of lines, expected: ${expected_lines}, actual: ${num_lines}." 1>&2
  echo "[ERROR] An execution result line is expected following the prefix '${EXECUTION_PREFIX}'" 1>&2