starting one data node thread to manage multiple data directories
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Key: HADOOP-257
URL: http://issues.apache.org/jira/browse/HADOOP-257
Project: Hadoop
Type: Improvement
Components: dfs
Reporter: Hairong Kuang
If a data node is configured with multiple data directories, current
implementation of dfs will start multiple data node threads, each of which
manages one data directory and talks to its name node independently. From the
name node's point of view, it sees multiple data nodes instead of one.
I feel that a more scalable solution should be to start one data node thread
that manages multiple data diretories. But the one data node thread needs to
take care of the block allocation problem.
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