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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