From 44367f55e8bbd252ae824d1ddb626b5ce91fe75d Mon Sep 17 00:00:00 2001
From: stack <stack@apache.org>
Date: Mon, 9 Nov 2015 13:43:32 -1000
Subject: [PATCH]   HBASE-14772 Improve zombie detector; be more discerning;
 ADDENDUM fix zombie-detectors' handling of no processes -- was treating no
 processes as one possible zombie

---
 dev-support/zombie-detector.sh | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/dev-support/zombie-detector.sh b/dev-support/zombie-detector.sh
index a7856eb356a..e20828f4169 100755
--- a/dev-support/zombie-detector.sh
+++ b/dev-support/zombie-detector.sh
@@ -99,8 +99,12 @@ find_processes () {
 ### Look for zombies
 zombies () {
   ZOMBIES=`find_processes`
-  # xargs trims white space before and after the count
-  ZOMBIE_TESTS_COUNT=`echo "${ZOMBIES}"|wc -l|xargs`
+  if [[ -z ${ZOMBIES} ]]
+  then
+    ZOMBIE_TESTS_COUNT=0
+  else
+    ZOMBIE_TESTS_COUNT=`echo "${ZOMBIES}"| wc -l| xargs`
+  fi
   if [[ $ZOMBIE_TESTS_COUNT != 0 ]] ; then
     wait=30
     echo "`date` Found ${ZOMBIE_TESTS_COUNT} suspicious java process(es) listed below; waiting ${wait}s to see if just slow to stop"