[HADOOP-13435] Add thread local mechanism for aggregating file system storage stats - ASF JIRA

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Details

Type: Sub-task
Status: Patch Available
Priority: Major
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: fs
Labels:
None

Description

As discussed in HADOOP-13032, this is to add thread local mechanism for aggregating file system storage stats. This class will also be used in HADOOP-13031, which is to separate the distance-oriented rack-aware read bytes logic from FileSystemStorageStatistics to new DFSRackAwareStorageStatistics as it's DFS-specific. After this patch, the FileSystemStorageStatistics can live without the to-be-removed FileSystem$Statistics implementation.

A unit test should also be added.