After taking snapshot (upgrade) on Federation, the current directory of data
node is emtpy.
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Key: HDFS-1881
URL: https://issues.apache.org/jira/browse/HDFS-1881
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Tanping Wang
Assignee: Tanping Wang
After taking a snapshot in Federation (by starting up namenode with option
-upgrade), it appears that the current directory of data node does not contain
the block files. We have also verified that upgrading from 20 to Federation
does not have this problem.
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