rolling-restart.sh script hangs when attempting to detect expiration of
/hbase/master znode.
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Key: HBASE-5603
URL: https://issues.apache.org/jira/browse/HBASE-5603
Project: HBase
Issue Type: Bug
Components: zookeeper
Affects Versions: 0.92.0, 0.94.0, 0.96.0
Reporter: Jonathan Hsieh
Due to bugfix ZOOKEEPER-1059 (ZK 3.4.0+), the rolling-restart.sh script will
hang when attempting to make sure the /hbase/master znode is deleted.
Here's the code
{code}
# make sure the master znode has been deleted before continuing
zparent=`$bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool
zookeeper.znode.parent`
if [ "$zparent" == "null" ]; then zparent="/hbase"; fi
zmaster=`$bin/hbase org.apache.hadoop.hbase.util.HBaseConfTool
zookeeper.znode.master`
if [ "$zmaster" == "null" ]; then zmaster="master"; fi
zmaster=$zparent/$zmaster
echo -n "Waiting for Master ZNode ${zmaster} to expire"
while bin/hbase zkcli stat $zmaster >/dev/null 2>&1; do
echo -n "."
sleep 1
done
echo #force a newline
{code}
Prior to ZOOKEEPER-1059, stat on a null znode would NPE and cause zkcli to exit
with retcode 1. Afterwards, the null is caught, zkcli will exit with 0 in the
case where the znode is present and in the case where it does not exist.
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