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https://issues.apache.org/jira/browse/HDFS-976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12878318#action_12878318
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Mingjie Lai commented on HDFS-976:
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@Dmytro
Which branch did you make the patch against?
I checked out hadoop-common branch-0.20, and had been trying to apply your
patch, but always got compilation errors -- http://pastebin.ca/1881910.
I'm pretty new to the hdfs code base. Did I miss anything here?
compile:
[echo] contrib: highavailability
[javac] Compiling 10 source files to
/home/mlai/git/hadoop/hadoop-common/build/contrib/highavailability/classes
[javac]
/home/mlai/git/hadoop/hadoop-common/src/contrib/highavailability/src/java/org/apache/hadoop/hdfs/AvatarClient.java:258:
init() has protected access in org.apache.hadoop.fs.FsShell
[javac] fh.init();
[javac] ^
[javac]
/home/mlai/git/hadoop/hadoop-common/src/contrib/highavailability/src/java/org/apache/hadoop/hdfs/AvatarClient.java:260:
delete(org.apache.hadoop.fs.Path,org.apache.hadoop.fs.FileSystem,boolean,boolean)
has private access in org.apache.hadoop.fs.FsShell
[javac] fh.delete(p, p.getFileSystem(conf), recursive, false);
[javac] ^
[javac]
/home/mlai/git/hadoop/hadoop-common/src/contrib/highavailability/src/java/org/apache/hadoop/hdfs/AvatarClient.java:1849:
cannot find symbol
[javac] symbol : class BlockMissingException
[javac] location: class org.apache.hadoop.hdfs.AvatarClient.DFSInputStream
[javac] throw new BlockMissingException(src, "Could not obtain
block: " + blockInfo, block.getStartOffset());
[javac] ^
[javac]
/home/mlai/git/hadoop/hadoop-common/src/contrib/highavailability/src/java/org/apache/hadoop/hdfs/server/datanode/AvatarDataNode.java:659:
cannot find symbol
[javac] symbol : method
getNameNodeAddress(org.apache.hadoop.conf.Configuration)
[javac] location: class org.apache.hadoop.hdfs.server.datanode.DataNode
[javac] return DataNode.getNameNodeAddress(newconf);
[javac] ^
[javac]
/home/mlai/git/hadoop/hadoop-common/src/contrib/highavailability/src/java/org/apache/hadoop/hdfs/server/namenode/AvatarNode.java:291:
cannot find symbol
[javac] symbol : method writeLock()
[javac] location: class org.apache.hadoop.hdfs.server.namenode.FSNamesystem
[javac] namesystem.writeLock();
...
> Hot Standby for NameNode
> ------------------------
>
> Key: HDFS-976
> URL: https://issues.apache.org/jira/browse/HDFS-976
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: name-node
> Reporter: dhruba borthakur
> Assignee: Dmytro Molkov
> Attachments: AvatarNode.patch, AvatarNodeDescription.txt,
> AvatarPatch.2.patch
>
>
> This is a place holder to share our code and experiences about implementing a
> Hot Standby for the HDFS NameNode for hadoop 0.20.
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