He Xiaoqiao created HDFS-14632:
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Summary: Reduce useless #getNumLiveDataNodes call in
SafeModeMonitor
Key: HDFS-14632
URL: https://issues.apache.org/jira/browse/HDFS-14632
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: He Xiaoqiao
Assignee: He Xiaoqiao
As mentioned HDFS-14171, SafeModeMonitor invoke useless #getNumLiveDataNodes if
not config DataNode threshold.
The root cause is BlockManagerSafeMode#reportStatus(for trunk branch) or
SafeModeInfo#reportStatus (for branch-2.8) print status every 20 seconds and
invoke SafeModeInfo#getTurnOffTip.
Optimize with checking if config DataNode threshold then decide to if get
number of live DataNodes.
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