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Posted to common-issues@hadoop.apache.org by "Eli Collins (Created) (JIRA)" <ji...@apache.org> on 2011/12/14 10:40:31 UTC

[jira] [Created] (HADOOP-7924) 
FailoverController for client-based configuration


FailoverController for client-based configuration
--------------------------------------------------

                 Key: HADOOP-7924
                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
             Project: Hadoop Common
          Issue Type: Sub-task
          Components: ha
    Affects Versions: HA Branch (HDFS-1623)
            Reporter: Eli Collins
            Assignee: Eli Collins


Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Hudson (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181354#comment-13181354 ] 

Hudson commented on HADOOP-7924:
--------------------------------

Integrated in Hadoop-Hdfs-HAbranch-build #39 (See [https://builds.apache.org/job/Hadoop-Hdfs-HAbranch-build/39/])
    HADOOP-7924. 
FailoverController for client-based configuration. Contributed by Eli Collins

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227836
Files : 
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/CHANGES.HDFS-1623.txt
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/bin/hadoop
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/FailoverController.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/FailoverFailedException.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/HAAdmin.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/HealthCheckFailedException.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/ServiceFailedException.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ha/TestFailoverController.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ha/TestHAAdmin.java

                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: HA Branch (HDFS-1623)
>
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Updated] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Eli Collins (Updated) (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HADOOP-7924:
--------------------------------

    Comment: was deleted

(was: Integrated in Hadoop-Mapreduce-0.23-Build #151 (See [https://builds.apache.org/job/Hadoop-Mapreduce-0.23-Build/151/])
    HADOOP-7924. svn merge -c 1227423 from trunk

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227431
Files : 
* /hadoop/common/branches/branch-0.23
* /hadoop/common/branches/branch-0.23/hadoop-common-project
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-auth
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/docs
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/core
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* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/io/TestSequenceFileMergeProgress.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/ipc
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/security/authorize/TestServiceLevelAuthorization.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/test/MapredTestDriver.java
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* /hadoop/common/branches/branch-0.23/hadoop-project
* /hadoop/common/branches/branch-0.23/hadoop-project/src/site
)
    
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Hudson (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180114#comment-13180114 ] 

Hudson commented on HADOOP-7924:
--------------------------------

Integrated in Hadoop-Common-0.23-Commit #341 (See [https://builds.apache.org/job/Hadoop-Common-0.23-Commit/341/])
    HADOOP-7924. svn merge -c 1227423 from trunk

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227431
Files : 
* /hadoop/common/branches/branch-0.23
* /hadoop/common/branches/branch-0.23/hadoop-common-project
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-auth
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/docs
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/core
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestSaslRPC.java
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* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/ipc
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/security/authorize/TestServiceLevelAuthorization.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/test/MapredTestDriver.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/webapps/job
* /hadoop/common/branches/branch-0.23/hadoop-project
* /hadoop/common/branches/branch-0.23/hadoop-project/src/site

                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Hudson (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180366#comment-13180366 ] 

Hudson commented on HADOOP-7924:
--------------------------------

Integrated in Hadoop-Mapreduce-0.23-Build #151 (See [https://builds.apache.org/job/Hadoop-Mapreduce-0.23-Build/151/])
    HADOOP-7924. svn merge -c 1227423 from trunk

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227431
Files : 
* /hadoop/common/branches/branch-0.23
* /hadoop/common/branches/branch-0.23/hadoop-common-project
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-auth
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/docs
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/core
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestSaslRPC.java
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* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/io/FileBench.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/io/TestSequenceFileMergeProgress.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/ipc
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/security/authorize/TestServiceLevelAuthorization.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/test/MapredTestDriver.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/webapps/job
* /hadoop/common/branches/branch-0.23/hadoop-project
* /hadoop/common/branches/branch-0.23/hadoop-project/src/site

                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Todd Lipcon (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180150#comment-13180150 ] 

Todd Lipcon commented on HADOOP-7924:
-------------------------------------

bq. Think the typo case I mentioned above is worth worrying about or a non-issue since we let people explicitly transition more than one NN to active (and have to handle that fallout)?

I think what you said earlier ("Another jira for warning if X is not specified as one of the options in dfs.ha.namenodes or we add a flag that's required to failover from a service we can't connect to?") makes sense -- you shouldn't allow people to specify NNs on this command when they aren't listed in your config. Another JIRA seems OK, since the cross-project nature is a little annoying..
                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Updated] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Eli Collins (Updated) (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HADOOP-7924:
--------------------------------

    Comment: was deleted

(was: Integrated in Hadoop-Common-0.23-Commit #341 (See [https://builds.apache.org/job/Hadoop-Common-0.23-Commit/341/])
    HADOOP-7924. svn merge -c 1227423 from trunk

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227431
Files : 
* /hadoop/common/branches/branch-0.23
* /hadoop/common/branches/branch-0.23/hadoop-common-project
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-auth
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/docs
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/core
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)
    
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Todd Lipcon (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177475#comment-13177475 ] 

Todd Lipcon commented on HADOOP-7924:
-------------------------------------

- maybe we should rename FailoverController to ManualFailoverController? or even just ManualFailover? IMO "FailoverController" has always had a connotation of being some kind of daemon.
- in the preFailoverCheck, I'd expect us to support the case where "svc1" is down -- ie the admin has noticed the active crashed, and therefore wants to initiate failover to svc2. We should treat this the same as a failure in calling transitionToStandby - i.e fence and continue.
- {{svc1}} and {{svc2}} aren't very descriptive parameter names - maybe {{fromSvc}} and {{toSvc}} or {{oldActive}} and {{newActive}}? The javadoc in {{failover(...)}} is also incorrect here for {{svc2Name}}
- in {{FailoverFailedException}}, no need to duplicate the standard exception javadoc from its parent class
                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Updated] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Eli Collins (Updated) (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HADOOP-7924:
--------------------------------

    Attachment: hadoop-7924.txt

#1 Done
#2 Added missing catch Exception in transitionToActive
#3-4 Done
#5 Just removed the test. Think the typo case I mentioned above is worth worrying about or a non-issue since we let people explicitly transition more than one NN to active (and have to handle that fallout)?
#6 The "cluster" was running on one host, though yes, the failover is done between two independent NN processes running with HA enabled using a shared dir.
                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Todd Lipcon (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180151#comment-13180151 ] 

Todd Lipcon commented on HADOOP-7924:
-------------------------------------

+1 on the patch
                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Todd Lipcon (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180045#comment-13180045 ] 

Todd Lipcon commented on HADOOP-7924:
-------------------------------------

in {{preFailoverChecks}}, I think it's clearer to structure the code like:
{code}
HAServiceState toSvcState;
try {
  toSvcState = toSvc.getServiceState();
} catch (Exception e) {
  // throw the FailoverFailed
}

// now check toSvcState.equals(STANDBY)
{code}
rather than trying to collapse both exceptions into one throw. Also, should log the exception thrown by getServiceState.

----

In {{failover()}}, I think you probably want to catch all Throwables in another catch clause - eg what if it's in some bad state and your failover attempt caused it to crash, which would give your IPC a SocketTimeoutException.

----
{code}
+  public FailoverFailedException(String message, Throwable cause) {
+      super(message, cause);
{code}
indentation

----
{code}
+        new UsageInfo("<host:port> <host:port>",
+            "Failover from the 1st daemon to the 2nd"))
{code}
I think better to not abbreviate "first" and "second"

----
- Can you add some javadoc to {{testManualFailoverCanResultInTwoActives}} -- it's strange that this is a test case... it's more like you're showing that a particular user error can cause a problem, rather than showing something about the bug, right? Or else it should be a test case that fails, with an @Ignore explaining why it fails, maybe?

- Just to confirm, the manual test you mentioned was done with two NNs in a running HA cluster?
                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Eli Collins (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13177807#comment-13177807 ] 

Eli Collins commented on HADOOP-7924:
-------------------------------------

bq. maybe we should rename FailoverController to ManualFailoverController? or even just ManualFailover? IMO "FailoverController" has always had a connotation of being some kind of daemon.

This could be used for automatic failover as well though right? I was thinking this class would eventually get a main method and become a daemon (the static methods would still support manual failover). If not, maybe rename HAFailover?

Updated patch coming that addresses your other feedback.
                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Hudson (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180146#comment-13180146 ] 

Hudson commented on HADOOP-7924:
--------------------------------

Integrated in Hadoop-Mapreduce-0.23-Commit #352 (See [https://builds.apache.org/job/Hadoop-Mapreduce-0.23-Commit/352/])
    HADOOP-7924. svn merge -c 1227423 from trunk

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227431
Files : 
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* /hadoop/common/branches/branch-0.23/hadoop-common-project
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> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Updated] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Eli Collins (Updated) (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HADOOP-7924:
--------------------------------

    Attachment: hadoop-7924.txt

Thanks for the good feedback. Updated patch attached, addresses your comments, also adds an "haadmin" hook into bin/hadoop.

#1 Lemme know if my comment wrt naming made sense.
#2 Agree. Was originally thinking in this case the admin would just make the standby active directly, but we need to run through the whole failover in this case for fencing. Updated code and tests. For sanity, I ran bin/hadoop haadmin failover X Y and verified that it works (and prints something reasonable) when X isn't running, and fails when Y isn't yet running (and A remains active of course). Note that this means if we failover from X to Y and there's a typo in X then you might unexpectedely end up with two actives (added testManualFailoverCanResultInTwoActives). Another jira for warning if X is not specified as one of the options in dfs.ha.namenodes or we add a flag that's required to failover from a service we can't connect to?
#3 Done.
#4 Done. Also fixed up the other HA exceptions to be consistent.
                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Updated] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Eli Collins (Updated) (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HADOOP-7924:
--------------------------------

    Attachment: hadoop-7924.txt

Patch attached. Introduces a basic FailoverController that can be used for manual failover (no monitoring or leader election) and wires it into the CLI.
                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Hudson (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180335#comment-13180335 ] 

Hudson commented on HADOOP-7924:
--------------------------------

Integrated in Hadoop-Hdfs-0.23-Build #129 (See [https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/129/])
    HADOOP-7924. svn merge -c 1227423 from trunk

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227431
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* /hadoop/common/branches/branch-0.23
* /hadoop/common/branches/branch-0.23/hadoop-common-project
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-auth
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* /hadoop/common/branches/branch-0.23/hadoop-project/src/site

                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Updated] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Eli Collins (Updated) (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HADOOP-7924:
--------------------------------

    Comment: was deleted

(was: Integrated in Hadoop-Hdfs-0.23-Build #129 (See [https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/129/])
    HADOOP-7924. svn merge -c 1227423 from trunk

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227431
Files : 
* /hadoop/common/branches/branch-0.23
* /hadoop/common/branches/branch-0.23/hadoop-common-project
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-auth
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common
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)
    
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Updated] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Eli Collins (Updated) (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HADOOP-7924:
--------------------------------

    Comment: was deleted

(was: Integrated in Hadoop-Hdfs-0.23-Commit #330 (See [https://builds.apache.org/job/Hadoop-Hdfs-0.23-Commit/330/])
    HADOOP-7924. svn merge -c 1227423 from trunk

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227431
Files : 
* /hadoop/common/branches/branch-0.23
* /hadoop/common/branches/branch-0.23/hadoop-common-project
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-auth
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/docs
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java
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* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java
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)
    
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Updated] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Eli Collins (Updated) (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins updated HADOOP-7924:
--------------------------------

    Comment: was deleted

(was: Integrated in Hadoop-Mapreduce-0.23-Commit #352 (See [https://builds.apache.org/job/Hadoop-Mapreduce-0.23-Commit/352/])
    HADOOP-7924. svn merge -c 1227423 from trunk

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227431
Files : 
* /hadoop/common/branches/branch-0.23
* /hadoop/common/branches/branch-0.23/hadoop-common-project
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-auth
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/docs
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/core
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestSaslRPC.java
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs
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* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/bin
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/conf
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* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/c++
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* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/block_forensics
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* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred
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* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/io/TestSequenceFileMergeProgress.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/ipc
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/security/authorize/TestServiceLevelAuthorization.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/test/MapredTestDriver.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/webapps/job
* /hadoop/common/branches/branch-0.23/hadoop-project
* /hadoop/common/branches/branch-0.23/hadoop-project/src/site
)
    
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Hudson (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180113#comment-13180113 ] 

Hudson commented on HADOOP-7924:
--------------------------------

Integrated in Hadoop-Hdfs-0.23-Commit #330 (See [https://builds.apache.org/job/Hadoop-Hdfs-0.23-Commit/330/])
    HADOOP-7924. svn merge -c 1227423 from trunk

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1227431
Files : 
* /hadoop/common/branches/branch-0.23
* /hadoop/common/branches/branch-0.23/hadoop-common-project
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-auth
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/docs
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeys.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Client.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/Server.java
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/core
* /hadoop/common/branches/branch-0.23/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ipc/TestSaslRPC.java
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/java
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/native
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/datanode
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/secondary
* /hadoop/common/branches/branch-0.23/hadoop-hdfs-project/hadoop-hdfs/src/test/hdfs
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/.gitignore
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/bin
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/conf
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/resources/mapred-default.xml
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-examples
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-site
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-yarn/hadoop-yarn-site/src/site/apt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/c++
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/block_forensics
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/build-contrib.xml
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/build.xml
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/data_join
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/eclipse-plugin
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/index
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/contrib/vaidya
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/examples
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/fs
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/hdfs
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/io/FileBench.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/io/TestSequenceFileMergeProgress.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/ipc
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/security/authorize/TestServiceLevelAuthorization.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/test/mapred/org/apache/hadoop/test/MapredTestDriver.java
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/src/webapps/job
* /hadoop/common/branches/branch-0.23/hadoop-project
* /hadoop/common/branches/branch-0.23/hadoop-project/src/site

                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>         Attachments: hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Commented] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Eli Collins (Commented) (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13180845#comment-13180845 ] 

Eli Collins commented on HADOOP-7924:
-------------------------------------

And filed HADOOP-7958 to require both services be present in the config.
                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: HA Branch (HDFS-1623)
>
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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[jira] [Resolved] (HADOOP-7924) 
FailoverController for client-based configuration

Posted by "Eli Collins (Resolved) (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HADOOP-7924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins resolved HADOOP-7924.
---------------------------------

          Resolution: Fixed
       Fix Version/s: HA Branch (HDFS-1623)
    Target Version/s:   (was: HA Branch (HDFS-1623))
        Hadoop Flags: Reviewed

Thanks for the reviews Todd. I've committed this to branch. 
                
> 
FailoverController for client-based configuration
> --------------------------------------------------
>
>                 Key: HADOOP-7924
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7924
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>    Affects Versions: HA Branch (HDFS-1623)
>            Reporter: Eli Collins
>            Assignee: Eli Collins
>             Fix For: HA Branch (HDFS-1623)
>
>         Attachments: hadoop-7924.txt, hadoop-7924.txt, hadoop-7924.txt
>
>
> Basic FailoverController to coordinate fail-over using a client-based config (ie fail-over from NameNode x to NameNode y). 

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