Use a better local directory layout for the datanode
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Key: HDFS-3290
URL: https://issues.apache.org/jira/browse/HDFS-3290
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 0.23.0
Reporter: Colin Patrick McCabe
Assignee: Colin Patrick McCabe
Priority: Minor
When the HDFS DataNode stores chunks in a local directory, it currently puts
all of the chunk files into one big directory. As the number of files
increases, this does not work well at all. Local filesystems are not optimized
for the case where there are hundreds of thousands of files in the same
directory. It also makes inspecting directories with standard UNIX tools
difficult.
Similar to the git version control system, HDFS should create a few different
top level directories keyed off of a few bits in the chunk ID. Git uses 8
bits. This substantially cuts down on the number of chunk files in the same
directory and gives increased performance.
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