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https://issues.apache.org/jira/browse/HDFS-7611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14296063#comment-14296063
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Byron Wong commented on HDFS-7611:
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Thanks for taking over the work for this JIRA, [~jingzhao]!
> deleteSnapshot and delete of a file can leave orphaned blocks in the
> blocksMap on NameNode restart.
> ---------------------------------------------------------------------------------------------------
>
> Key: HDFS-7611
> URL: https://issues.apache.org/jira/browse/HDFS-7611
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.6.0
> Reporter: Konstantin Shvachko
> Assignee: Jing Zhao
> Priority: Critical
> Fix For: 2.7.0
>
> Attachments: HDFS-7611.000.patch, HDFS-7611.001.patch,
> HDFS-7611.002.patch, blocksNotDeletedTest.patch, testTruncateEditLogLoad.log
>
>
> If quotas are enabled a combination of operations *deleteSnapshot* and
> *delete* of a file can leave orphaned blocks in the blocksMap on NameNode
> restart. They are counted as missing on the NameNode, and can prevent
> NameNode from coming out of safeMode and could cause memory leak during
> startup.
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