LeaseRenew RPC does not need to grab fsnamesystem write lock
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Key: HDFS-1436
URL: https://issues.apache.org/jira/browse/HDFS-1436
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.22.0
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.22.0
Lease renew RPC changes neither fsdirectory nor blocksMap. It only updates
lease related data structure. Since all accesses of lease related data
structures are already synced on leaseManager lock, I do not think the lease
renew RPC needs to grab the fsnamesystem write lock. This will greatly reduce
the pressure on NameNode when there are large number of files are open for
writing in an HDFS cluster.
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