[jira] [Created] (ZOOKEEPER-1991) zkServer.sh returns with a zero exit status when a ZooKeeper process is already running

["Reed Wanderman-Milne (JIRA)" <ji...@apache.org>]

Reed Wanderman-Milne created ZOOKEEPER-1991:
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             Summary: zkServer.sh returns with a zero exit status when a ZooKeeper process is already running
                 Key: ZOOKEEPER-1991
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1991
             Project: ZooKeeper
          Issue Type: Bug
          Components: scripts
    Affects Versions: 3.4.6
            Reporter: Reed Wanderman-Milne
            Priority: Minor


If ZooKeeper is started with zkServer.sh, and an error is shown that a ZooKeeper process is already running, the command returns with an exit status of 0, while it should end with a non-zero exit status.

Example:
$ bin/zkServer.sh start
JMX enabled by default
Using config: /home/reed/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... already running as process 25063.
$ echo $?
0

This can make it difficult for automated scripts to check if creating a new ZooKeeper process was successful, as it won't catch if a user accidentally started it before. 




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