Decomissioning on NN restart can complete without blocks being replicated
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Key: HDFS-3087
URL: https://issues.apache.org/jira/browse/HDFS-3087
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Affects Versions: 0.23.0, 0.24.0
Reporter: Kihwal Lee
Priority: Critical
Fix For: 0.24.0, 0.23.2, 0.23.3, 0.23.0
If a data node is added to the exclude list and the name node is restarted, the
decomissioning happens right away on the data node registration. At this point
the initial block report has not been sent, so the name node thinks the node
has zero blocks and the decomissioning completes very quick, without
replicating the blocks on that node.
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