Ye Ni created HDFS-15594:
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Summary: Lazy calculate live datanodes in safe mode tip
Key: HDFS-15594
URL: https://issues.apache.org/jira/browse/HDFS-15594
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: Ye Ni
Safe mode tip is printed every 20 seconds.
This change is to calculate live datanodes until reported block threshold is
meet.
This could further reduce safe mode time from 1 hour to 45 minutes in
MTPrime-CO4-3.
Old
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{code:java}
STATE* Safe mode ON. The reported blocks 111054015 needs additional 27902753
blocks to reach the threshold 0.9990 of total blocks 139095856. The number of
live datanodes 2531 has reached the minimum number 1. Safe mode will be turned
off automatically once the thresholds have been reached.{code}
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New
{{}}
{code:java}
STATE* Safe mode ON.
The reported blocks 134851250 needs additional 3218494 blocks to reach the
threshold 0.9990 of total blocks 138207947.
The minimum number of live datanodes is not calculated since reported blocks
hasn't reached the threshold. Safe mode will be turned off automatically once
the thresholds have been reached.{code}
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