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https://issues.apache.org/jira/browse/HBASE-5603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233829#comment-13233829
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Lars Hofhansl commented on HBASE-5603:
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@Ted: Let's fix the issue at hand in this jira.
We can have another jira for the point you mention.
> rolling-restart.sh script hangs when attempting to detect expiration of
> /hbase/master znode.
> --------------------------------------------------------------------------------------------
>
> 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
> Priority: Blocker
>
> 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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