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https://issues.apache.org/jira/browse/HDFS-14952?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16976911#comment-16976911
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Wei-Chiu Chuang commented on HDFS-14952:
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+1
> Skip safemode if blockTotal is 0 in new NN
> ------------------------------------------
>
> Key: HDFS-14952
> URL: https://issues.apache.org/jira/browse/HDFS-14952
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Reporter: Rajesh Balamohan
> Assignee: Xiaoqiao He
> Priority: Trivial
> Labels: performance
> Attachments: HDFS-14952.001.patch, HDFS-14952.002.patch,
> HDFS-14952.003.patch
>
>
> When new NN is installed, it spends 30-45 seconds in Safemode. When
> {{blockTotal}} is 0, it should be possible to short circuit safemode check in
> {{BlockManagerSafeMode::areThresholdsMet}}.
> https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/blockmanagement/BlockManagerSafeMode.java#L571
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