Refactor the start-time Directory Tree and Replicas Map constructors to share
data and run volume-parallel
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Key: HDFS-1446
URL: https://issues.apache.org/jira/browse/HDFS-1446
Project: Hadoop HDFS
Issue Type: Sub-task
Components: data-node
Affects Versions: 0.20.2
Reporter: Matt Foley
Assignee: Matt Foley
Fix For: 0.22.0
Refactor the FSDir() and getVolumeMap() call chains in FSDataset, so they share
data and run volume-parallel. Currently the two constructors for in-memory
directory tree and replicas map run THREE full scans of the entire disk - once
in FSDir(), once in recoverTempUnlinkedBlock(), and once in addToReplicasMap().
During each scan, a new File object is created for each of the 100,000 or so
items in the native file system (for a 50,000-block node). This impacts GC as
well as disk traffic.
This work item is one of four sub-tasks for HDFS-1443, Improve Datanode startup
time.
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