Not marking datanodes dead When namenode in safemode
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Key: HDFS-1541
URL: https://issues.apache.org/jira/browse/HDFS-1541
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.23.0
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.23.0
In a big cluster, when namenode starts up, it takes a long time for namenode
to process block reports from all datanodes. Because heartbeats processing get
delayed, some datanodes are erroneously marked as dead, then later on they have
to register again, thus wasting time.
It would speed up starting time if the checking of dead nodes is disabled when
namenode in safemode.
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