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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7961) HA: fencing mechanism
Date Sat, 07 Jan 2012 14:40:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13181976#comment-13181976
] 

Hudson commented on HADOOP-7961:
--------------------------------

Integrated in Hadoop-Hdfs-HAbranch-build #40 (See [https://builds.apache.org/job/Hadoop-Hdfs-HAbranch-build/40/])
    HADOOP-7961. Move HA fencing to common. Contributed by Eli Collins

eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1228510
Files : 
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/pom.xml
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/BadFencingConfigurationException.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/FenceMethod.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/NodeFencer.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/ShellCommandFencer.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/SshFenceByTcpPort.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ha/StreamPumper.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ha/TestNodeFencer.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ha/TestShellCommandFencer.java
* /hadoop/common/branches/HDFS-1623/hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/ha/TestSshFenceByTcpPort.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/pom.xml
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/BadFencingConfigurationException.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/FenceMethod.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/NodeFencer.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/ShellCommandFencer.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/SshFenceByTcpPort.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/ha/StreamPumper.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestNodeFencer.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestShellCommandFencer.java
* /hadoop/common/branches/HDFS-1623/hadoop-hdfs-project/hadoop-hdfs/src/test/java/org/apache/hadoop/hdfs/server/namenode/ha/TestSshFenceByTcpPort.java

                
> HA: fencing mechanism
> ---------------------
>
>                 Key: HADOOP-7961
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7961
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: ha
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: HA Branch (HDFS-1623)
>
>         Attachments: hadoop-7961-delta.txt, hdfs-2179.txt, hdfs-2179.txt, hdfs-2179.txt
>
>
> In an HA cluster, when there are two NNs, the invariant that only one NN is active at
a time has to be preserved in order to prevent "split brain syndrome." Thus, when a standby
NN is transition to "active" state during a failover, it needs to somehow _fence_ the formerly
active NN to ensure that it can no longer perform edits. This JIRA is to discuss and implement
NN fencing.

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