Tsz Wo Nicholas Sze created HDFS-7396:
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Summary: Revisit synchronization in Namenode
Key: HDFS-7396
URL: https://issues.apache.org/jira/browse/HDFS-7396
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: Tsz Wo Nicholas Sze
Assignee: Tsz Wo Nicholas Sze
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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