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Posted to issues@hbase.apache.org by "Zhou wenjian (JIRA)" <ji...@apache.org> on 2012/11/07 04:10:12 UTC

[jira] [Created] (HBASE-7111) hbase zkcli will not start if the zookeeper server choosen to connectted to is not available

Zhou wenjian created HBASE-7111:
-----------------------------------

             Summary: hbase zkcli will not start if the zookeeper server choosen to connectted to  is not available
                 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: 0.94.4


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 
  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;
  }

the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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[jira] [Updated] (HBASE-7111) hbase zkcli will not start if the zookeeper server choosen to connectted to is not available

Posted by "Zhou wenjian (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HBASE-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhou wenjian updated HBASE-7111:
--------------------------------

    Attachment: HBASE-7111-trunk.patch
    
> hbase zkcli will not start if the zookeeper server choosen to connectted to  is not available
> ---------------------------------------------------------------------------------------------
>
>                 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: 0.94.4
>
>         Attachments: HBASE-7111-trunk.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 
>   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;
>   }
> the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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[jira] [Commented] (HBASE-7111) hbase zkcli will not start if the zookeeper server choosen to connectted to is not available

Posted by "Zhou wenjian (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HBASE-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492898#comment-13492898 ] 

Zhou wenjian commented on HBASE-7111:
-------------------------------------

will give a patch later
                
> hbase zkcli will not start if the zookeeper server choosen to connectted to  is not available
> ---------------------------------------------------------------------------------------------
>
>                 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: 0.94.4
>
>
> 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 
>   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;
>   }
> the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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[jira] [Commented] (HBASE-7111) hbase zkcli will not start if the zookeeper server choosen to connectted to is not available

Posted by "Zhou wenjian (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HBASE-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13493030#comment-13493030 ] 

Zhou wenjian commented on HBASE-7111:
-------------------------------------

The testcase modified could assert my change.

And i have tested it in my local test cluster, if one of the zookeeper server in conf works, the script will connect to zookeeper

                
> hbase zkcli will not start if the zookeeper server choosen to connectted to  is not available
> ---------------------------------------------------------------------------------------------
>
>                 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: 0.94.4
>
>         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 
>   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;
>   }
> the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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[jira] [Commented] (HBASE-7111) hbase zkcli will not start if the zookeeper server choosen to connectted to is not available

Posted by "stack (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HBASE-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492889#comment-13492889 ] 

stack commented on HBASE-7111:
------------------------------

Random seems fine but won't it just fail if we happen to choose the wrong one?  Why not a loop trying all ensemble members (as long as it times out fas).  You have a patch for us Zhou?  Thanks.
                
> hbase zkcli will not start if the zookeeper server choosen to connectted to  is not available
> ---------------------------------------------------------------------------------------------
>
>                 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: 0.94.4
>
>
> 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 
>   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;
>   }
> the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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[jira] [Commented] (HBASE-7111) hbase zkcli will not start if the zookeeper server choosen to connectted to is not available

Posted by "stack (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HBASE-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492647#comment-13492647 ] 

stack commented on HBASE-7111:
------------------------------

What did you have in your configuration?  Just z3?
                
> hbase zkcli will not start if the zookeeper server choosen to connectted to  is not available
> ---------------------------------------------------------------------------------------------
>
>                 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: 0.94.4
>
>
> 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 
>   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;
>   }
> the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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[jira] [Commented] (HBASE-7111) hbase zkcli will not start if the zookeeper server choosen to connectted to is not available

Posted by "Zhou wenjian (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HBASE-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492917#comment-13492917 ] 

Zhou wenjian commented on HBASE-7111:
-------------------------------------

patch for trunk
                
> hbase zkcli will not start if the zookeeper server choosen to connectted to  is not available
> ---------------------------------------------------------------------------------------------
>
>                 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: 0.94.4
>
>         Attachments: HBASE-7111-trunk.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 
>   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;
>   }
> the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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[jira] [Commented] (HBASE-7111) hbase zkcli will not start if the zookeeper server choosen to connectted to is not available

Posted by "Zhou wenjian (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HBASE-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492089#comment-13492089 ] 

Zhou wenjian commented on HBASE-7111:
-------------------------------------

IMO, need to choose a random server to connect, rather than the fixed one which is depended on the properties reading from conf
                
> hbase zkcli will not start if the zookeeper server choosen to connectted to  is not available
> ---------------------------------------------------------------------------------------------
>
>                 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: 0.94.4
>
>
> 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 
>   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;
>   }
> the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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[jira] [Updated] (HBASE-7111) hbase zkcli will not start if the zookeeper server choosen to connectted to is not available

Posted by "Zhou wenjian (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HBASE-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhou wenjian updated HBASE-7111:
--------------------------------

    Attachment: HBASE-7111-trunk-v2.patch
    
> hbase zkcli will not start if the zookeeper server choosen to connectted to  is not available
> ---------------------------------------------------------------------------------------------
>
>                 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: 0.94.4
>
>         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 
>   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;
>   }
> the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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[jira] [Commented] (HBASE-7111) hbase zkcli will not start if the zookeeper server choosen to connectted to is not available

Posted by "stack (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HBASE-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492956#comment-13492956 ] 

stack commented on HBASE-7111:
------------------------------

Please follow coding style the rest of the file has.  Any chance of a unit test asserting your change does as you suggest?  Thanks.  
                
> hbase zkcli will not start if the zookeeper server choosen to connectted to  is not available
> ---------------------------------------------------------------------------------------------
>
>                 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: 0.94.4
>
>         Attachments: HBASE-7111-trunk.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 
>   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;
>   }
> the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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[jira] [Commented] (HBASE-7111) hbase zkcli will not start if the zookeeper server choosen to connectted to is not available

Posted by "Zhou wenjian (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HBASE-7111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492882#comment-13492882 ] 

Zhou wenjian commented on HBASE-7111:
-------------------------------------

[~saint.ack@gmail.com]
i have s1,s2,s3 in my configuration

but the script will always choose s3 which is unavailable 
                
> hbase zkcli will not start if the zookeeper server choosen to connectted to  is not available
> ---------------------------------------------------------------------------------------------
>
>                 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: 0.94.4
>
>
> 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 
>   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;
>   }
> the code will choose the fixed zookeeper server (here is the unavailable s3), which leads to the script fails

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