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https://issues.apache.org/jira/browse/HDFS-17385?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ZanderXu reassigned HDFS-17385:
-------------------------------
Assignee: ZanderXu
> [FGL] Replace the global FS write locking with directory tree-based
> fine-grained locking
> ----------------------------------------------------------------------------------------
>
> Key: HDFS-17385
> URL: https://issues.apache.org/jira/browse/HDFS-17385
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Major
> Labels: FGL
>
> Second, we can replace the global FS write locking with directory tree-based
> fine-grained locking.
> This ticket doesn't remove this global FS locking, it just replaces the
> global FS write lock with the global FS read lock and directory tree-based
> fine-grained lock.
> For block-related operations and DN-related operations still need the global
> BM lock.
>
> The lock order should be:
> * The global FS lock
> * The global BM lock
> * The directory tree-based fine-grained lock
>
> This ticket should supports:
> * End-user can choose lock mode
> ** One global lock mode
> ** Global FS lock and global BM lock mode
> ** Global FS read lock, global BM lock and tree-based fine-grained lock
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