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https://issues.apache.org/jira/browse/HDFS-15594?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17201259#comment-17201259
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Xiaoqiao He commented on HDFS-15594:
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Thanks [~NickyYe] and [~elgoiri], it is useful works IMO. Just one concerns,
will there be any confuses for end user if BlockThreshold never meet datanode
threshold will not calculate when start phase?
Anyway, I always thought that BlockThreshold is fair enough for general cases
of NameNode restart, so +1 for this improvement from my side.
> 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
> Assignee: Ye Ni
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Safe mode tip is printed every 20 seconds.
> This change is to calculate live datanodes until reported block threshold is
> meet.
> Old
> {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}
> 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 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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