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https://issues.apache.org/jira/browse/HDFS-15569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17193701#comment-17193701
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Hemanth Boyina commented on HDFS-15569:
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One solution can be rename the current directory to current.tmp directory and
delete the current.tmp in parallel , as the current directory doesn't exists
now datanode upgrade can be proceeded
> Speed up the Storage#doRecover during datanode rolling upgrade
> ---------------------------------------------------------------
>
> Key: HDFS-15569
> URL: https://issues.apache.org/jira/browse/HDFS-15569
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Hemanth Boyina
> Assignee: Hemanth Boyina
> Priority: Major
>
> When upgrading datanode from hadoop 2.7.2 to 3.1.1 , because of jvm not
> having enough memory upgrade failed , Adjusted memory configurations and re
> upgraded datanode ,
> Now datanode upgrade has taken more time , on analyzing found that
> Storage#deleteDir has taken more time in Recover_Upgrade state
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