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https://issues.apache.org/jira/browse/HDFS-17366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17839393#comment-17839393
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Brahma Reddy Battula commented on HDFS-17366:
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is it good to upload the design doc to this Jira also (May be somebody will not
be having access to google docs or maintenance ...)?
Are we going to create separate branch for this development (Please ignore if
it's already done).?
> NameNode Fine-Grained Locking via Namespace Tree
> ------------------------------------------------
>
> Key: HDFS-17366
> URL: https://issues.apache.org/jira/browse/HDFS-17366
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs, namenode
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Major
>
> As we all known, the write performance of NameNode is limited by the global
> lock. We target to enable fine-grained locking based on the Namespace tree to
> improve the performance of NameNode write operations.
> There are multiple motivations for creating this ticket:
> * We have implemented this fine-grained locking and gained nearly 7x
> performance improvements in our prod environment
> * Other companies made similar improvements based on their internal branch.
> Internal branches are quite different from the community, so few feedback and
> discussions in the community.
> * The topic of fine-grained locking has been discussed for a very long time,
> but still without any results.
>
> We implemented this fine-gained locking based on the namespace tree to
> maximize the number of concurrency for disjoint or independent operations.
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