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https://issues.apache.org/jira/browse/HADOOP-4764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653666#action_12653666
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Ruyue Ma commented on HADOOP-4764:
----------------------------------
We doesn't need modify the FSImage, we only modify the FSEditLog.
Current FSImage sets 0 to the default replication factor for directory.
The modification for FSEditLog doesn't affect the compatible with old log
format.
the original code in FSEditLog
/**
* Add create directory record to edit log
*/
public void logMkDir(String path, INode newNode) {
UTF8 info[] = new UTF8[] {
new UTF8(path),
FSEditLog.toLogLong(newNode.getModificationTime()),
FSEditLog.toLogLong(newNode.getAccessTime())
};
logEdit(OP_MKDIR, new ArrayWritable(UTF8.class, info),
newNode.getPermissionStatus());
}
is modified to the following:
/**
* Add create directory record to edit log
*/
public void logMkDir(String path, INode newNode) {
UTF8 info[] = new UTF8[] {
new UTF8(path),
FSEditLog.toLogReplication(newNode.getReplication()),
FSEditLog.toLogLong(newNode.getModificationTime()),
FSEditLog.toLogLong(newNode.getAccessTime())
};
logEdit(OP_MKDIR, new ArrayWritable(UTF8.class, info),
newNode.getPermissionStatus());
}
> add replication factor for hdfs directory
> -----------------------------------------
>
> Key: HADOOP-4764
> URL: https://issues.apache.org/jira/browse/HADOOP-4764
> Project: Hadoop Core
> Issue Type: New Feature
> Components: dfs
> Reporter: Ruyue Ma
> Assignee: Ruyue Ma
>
> If we can set replication factor for directory. we can modify the
> DFSClent.create() method, pass 0 for the default block replication. Namenode
> check create request, if blockreplication is 0, it will give its parent dir
> replication factor to the file blockreplication factor. This will simplify
> the administration work. You know we can set /Test or /Tmp dir's replication
> factor 2 or 1, then all their children files and dirs replication factor is 2
> or 1 defaultly.
>
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