[HDFS-7396] Revisit synchronization in Namenode - ASF JIRA

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Details

Type: Improvement
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: namenode
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Description

~~HDFS-2106~~ separated block management to a new package from namenode. As part of it, some code was refactored to new classes such as DatanodeManager, HeartbeatManager, etc. There are opportunities for improve locking in namenode while currently the synchronization in namenode is mainly done by a single global FSNamesystem lock.

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1.	Add read-write lock to DatanodeManager	Open	Tsz-wo Sze	Actions
2.	The BlockManager should not use the FSN lock	Open	Unassigned	Actions
3.	Heartbeat processing doesn't have to take FSN readLock	Open	Unassigned	Actions