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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9868) add reading source cluster with HA access mode feature for DistCp
Date Mon, 28 Mar 2016 14:12:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15214231#comment-15214231
] 

Wei-Chiu Chuang commented on HDFS-9868:
---------------------------------------

Also, due to HDFS-9640, your patch for trunk will need to be rebased and to resolve conflicts...

> add reading source cluster with HA access mode feature for DistCp
> -----------------------------------------------------------------
>
>                 Key: HDFS-9868
>                 URL: https://issues.apache.org/jira/browse/HDFS-9868
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: distcp
>    Affects Versions: 2.7.1
>            Reporter: NING DING
>            Assignee: NING DING
>         Attachments: HDFS-9868.1.patch, HDFS-9868.2.patch, HDFS-9868.3.patch, HDFS-9868.4.patch
>
>
> Normally the HDFS cluster is HA enabled. It could take a long time when coping huge data
by distp. If the source cluster changes active namenode, the distp will run failed. This patch
supports the DistCp can read source cluster files in HA access mode. A source cluster configuration
file needs to be specified (via the -sourceClusterConf option).
>   The following is an example of the contents of a source cluster configuration
>   file:
> {code:xml}
>     <configuration>
>       <property>
> 		<name>fs.defaultFS</name>
> 		<value>hdfs://mycluster</value>
> 	  </property>
> 	  <property>
> 		<name>dfs.nameservices</name>
> 		<value>mycluster</value>
> 	  </property>
> 	  <property>
> 		<name>dfs.ha.namenodes.mycluster</name>
> 		<value>nn1,nn2</value>
> 	  </property>
> 	  <property>
> 		<name>dfs.namenode.rpc-address.mycluster.nn1</name>
> 		<value>host1:9000</value>
> 	  </property>
> 	  <property>
> 		<name>dfs.namenode.rpc-address.mycluster.nn2</name>
> 		<value>host2:9000</value>
> 	  </property>
> 	  <property>
> 		<name>dfs.namenode.http-address.mycluster.nn1</name>
> 		<value>host1:50070</value>
> 	  </property>
> 	  <property>
> 		<name>dfs.namenode.http-address.mycluster.nn2</name>
> 		<value>host2:50070</value>
> 	  </property>
> 	  <property>
> 		<name>dfs.client.failover.proxy.provider.mycluster</name>
> 		<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
> 	  </property>
> 	</configuration>
> {code}
>   The invocation of DistCp is as below:
> {code}
>     bash$ hadoop distcp -sourceClusterConf sourceCluster.xml /foo/bar hdfs://nn2:8020/bar/foo
> {code}



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