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Posted to hdfs-dev@hadoop.apache.org by "Hairong Kuang (JIRA)" <ji...@apache.org> on 2010/10/01 02:05:33 UTC

[jira] Created: (HDFS-1436) LeaseRenew RPC does not need to grab fsnamesystem write lock

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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