disambiguate "datanode dead" vs "datanode heartbeat expired"
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Key: HDFS-1879
URL: https://issues.apache.org/jira/browse/HDFS-1879
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.23.0
Reporter: Matt Foley
Priority: Minor
HDFS-1541 changed FSNamesystem.heartbeatCheck() so it would not call
removeDatanode() while the name system is in Safe Mode. However, calls to
FSNamesystem.isDatanodeDead() still show datanodes as dead if their heartbeat
is expired, so the Namenode status web page is not consistent with the intent
of HDFS-1541.
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