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Posted to hdfs-dev@hadoop.apache.org by "Yang Yun (Jira)" <ji...@apache.org> on 2020/04/15 06:39:00 UTC

[jira] [Created] (HDFS-15278) After execute ‘-setrep 1’, make sure that blocks of the file are dispersed across different datanodes

Yang Yun created HDFS-15278:
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             Summary: After execute ‘-setrep 1’, make sure that blocks of the file are dispersed across different datanodes
                 Key: HDFS-15278
                 URL: https://issues.apache.org/jira/browse/HDFS-15278
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: namenode
            Reporter: Yang Yun
            Assignee: Yang Yun


After execute ‘-setrep 1’, many of blocks of the file may locate on same machine. Especially the file is written on one datanode machine. That causes data hot spots and is hard to fix if this machine is down.

Add a chosen history to make sure that blocks of the file are dispersed across different datanodes.



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