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https://issues.apache.org/jira/browse/HDFS-3290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13256812#comment-13256812
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Matt Foley commented on HDFS-3290:
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Also same class name in hadoop-2, at
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/FSDataset.java.
> Use a better local directory layout for the datanode
> ----------------------------------------------------
>
> 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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