[Hadoop-common-dev] [jira] Created: (HADOOP-4986) FSNamesystem.getBlockLocations sets access time without holding the namespace locks

FSNamesystem.getBlockLocations sets access time without holding the namespace locks
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Key: HADOOP-4986
URL: https://issues.apache.org/jira/browse/HADOOP-4986
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Affects Versions: 0.19.0
Reporter: Tsz Wo (Nicholas), SZE
Priority: Blocker


After the access time feature is added to HDFS, FSNamesystem.getBlockLocations(..) is no longer a read only namespace operation. It changes the namespace by updating the access time. However, the thread does not own namespace locks. This may lead to namespace inconsistency.