Lei (Eddy) Xu created HDFS-7531:
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Summary: Improve the concurrent access of FsVolumeList
Key: HDFS-7531
URL: https://issues.apache.org/jira/browse/HDFS-7531
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Affects Versions: 2.6.0
Reporter: Lei (Eddy) Xu
Assignee: Lei (Eddy) Xu
{{FsVolumeList}} uses {{synchronized}} to protect the update on
{{FsVolumeList#volumes}}, while various operations (e.g., {{checkDirs()}},
{{getAvailable()}}) iterate {{volumes}} without protection.
This JIRA proposes to use {{AtomicReference}} to encapture {{volumes}} to
provide better concurrent access.
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