Code optimization/cleanup in HDFS
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Key: HADOOP-4583
URL: https://issues.apache.org/jira/browse/HADOOP-4583
Project: Hadoop Core
Issue Type: Bug
Components: dfs
Affects Versions: 0.20.0
Reporter: Suresh Srinivas
Assignee: Suresh Srinivas
Fix For: 0.20.0
Some of the changes needed:
- FSNameSystem.allocateBlock creates a lot of object unnecessarily to find a
blockID that is unused. It should reuse the Block object created by changing
the blockID and reusing the GenerationStamp.
- InodeFile.addBlock should use System.arrayCopy instead of copying 1 at a time.
- Some of the for loops in FSEditLog.java can be optimized. Instead of getting
the edit stream length in termination condition, a local variable should be
used to do the same.
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