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https://issues.apache.org/jira/browse/HDFS-17366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ZanderXu updated HDFS-17366:
Description:
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.
was:
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 off fine-grained locking has been discussed for a very long time
without progress.
We implemented this fine-gained locking based on the namespace tree to maximize
the number of concurrency for disjoint or independent operations.
> 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
>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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