Yi Liu created HDFS-6846:
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Summary: NetworkTopology#sortByDistance should give nodes higher
priority, which cache the block.
Key: HDFS-6846
URL: https://issues.apache.org/jira/browse/HDFS-6846
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Affects Versions: 2.6.0
Reporter: Yi Liu
Assignee: Yi Liu
Currently there are 3 weights:
* local
* same rack
* off rack
But if some nodes cache the block, then it's faster if client read block from
these nodes. So we should have some more weights as following:
* local
* cached & same rack
* same rack
* cached & off rack
* off rack
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