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https://issues.apache.org/jira/browse/HDFS-17398?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ZanderXu updated HDFS-17398:
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Affects Version/s: HDFS-17384
> [FGL] Implement the FGL lock for FSNLockManager
> -----------------------------------------------
>
> Key: HDFS-17398
> URL: https://issues.apache.org/jira/browse/HDFS-17398
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: HDFS-17384
> Reporter: ZanderXu
> Assignee: ZanderXu
> Priority: Major
> Labels: pull-request-available
>
> Implement the FGL lock for the FSNamesystemLock.
> We will use two global locks to implement this FGL lock in this milestone,
> FSLock and BMLock.
> The FSLock is used to protect some operations:
> * Directory tree-related operations.
> * FSEditLog related operations.
> * ErasureCodingPolicy related operations.
> The BMLock is used to protect some operations:
> * Block related operations
> * DN related operations
> Both FSLock and BMLock are needed for some operations:
> * The operations involves both directory tree and block
> * The operations involves both directory tree and dn
> * The operations involves both FSEdits and block
> The lock order should be:
> * Acquire the FSLock
> * Acquire the BMLock
> * Release the BMLock
> * Release the FSLock
>
> This FGL class implements the FSNamesystemLock interface, and it will
> acquire/release the locks according to the LockMode(GLOBAL, FS, BM).
> Locking process:
> * For the GLOBAL Lock mode, this FGL will acquire the FS lock first, then
> acquire the BM lock
> * For the FS Lock mode, this FGL will only acquire the FS lock
> * For the BM Lock mode, this FGL will only acquire the BM lock.
> Lock releasing process:
> * For the GLOBAL Lock mode, this FGL will release the BM lock first, then
> release the lock
> * For the FS Lock mode, this FGL will only release the FS lock
> * For the BM Lock mode, this FGL will only release the BM lock.
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