Inefficient FSDataset.getBlockFile()
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Key: HADOOP-2148
URL: https://issues.apache.org/jira/browse/HADOOP-2148
Project: Hadoop
Issue Type: Improvement
Affects Versions: 0.14.0
Reporter: Konstantin Shvachko
Fix For: 0.16.0
FSDataset.getBlockFile() first verifies that the block is valid and then
returns the file name corresponding to the block.
Doing that it performs the data-node blockMap lookup twice. Only one lookup is
needed here.
This is important since the data-node blockMap is big.
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