[jira] [Resolved] (HBASE-7111) hbase zkcli will not start if the zookeeper server chosen to connect to is unavailable

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl resolved HBASE-7111.
----------------------------------

      Resolution: Fixed
    Hadoop Flags: Reviewed

Committed to 0.94, 0.95, and 0.98.
(Also made sure that TestZooKeeperMainServerArg passes in each branch.
                
> hbase zkcli will not start if the zookeeper server chosen to connect to is unavailable
> --------------------------------------------------------------------------------------
>
>                 Key: HBASE-7111
>                 URL: https://issues.apache.org/jira/browse/HBASE-7111
>             Project: HBase
>          Issue Type: Bug
>          Components: Zookeeper
>    Affects Versions: 0.94.2
>            Reporter: Zhou wenjian
>            Assignee: Zhou wenjian
>             Fix For: 0.95.0, 0.98.0, 0.94.6
>
>         Attachments: HBASE-7111-trunk.patch, HBASE-7111-trunk-v2.patch
>
>
> there are 3 zookeeper servers in my cluster.
> s1
> s2
> s3
> after killing  s3, i found the hbase zkcli will not start again.
> it will try to connect to s3 continuely. 
> /11/07 11:01:01 INFO zookeeper.ClientCnxn: Opening socket connection to server s3
> 12/11/07 11:01:01 WARN zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
> java.net.ConnectException: Connection refused
> from the code 
> {code}
>   public String parse(final Configuration c) {
>     // Note that we do not simply grab the property
>     // HConstants.ZOOKEEPER_QUORUM from the HBaseConfiguration because the
>     // user may be using a zoo.cfg file.
>     Properties zkProps = ZKConfig.makeZKProps(c);
>     String host = null;
>     String clientPort = null;
>     for (Entry<Object, Object> entry: zkProps.entrySet()) {
>       String key = entry.getKey().toString().trim();
>       String value = entry.getValue().toString().trim();
>       if (key.startsWith("server.") && host == null) {
>         String[] parts = value.split(":");
>         host = parts[0];
>       } else if (key.endsWith("clientPort")) {
>         clientPort = value;
>       }
>       if (host != null && clientPort != null) break;
>     }
>     return host != null && clientPort != null? host + ":" + clientPort: null;
>   }
> {code}
> the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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