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Posted to hdfs-dev@hadoop.apache.org by "Yi Liu (JIRA)" <ji...@apache.org> on 2014/08/13 08:36:12 UTC

[jira] [Created] (HDFS-6846) NetworkTopology#sortByDistance should give nodes higher priority, which cache the block.

Yi Liu created HDFS-6846:
----------------------------

             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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