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https://issues.apache.org/jira/browse/HDFS-3974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Isaacson reassigned HDFS-3974:
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Assignee: Andy Isaacson
> dfsadmin -metasave throws NPE when under-replicated blocks are recently
> deleted
> -------------------------------------------------------------------------------
>
> Key: HDFS-3974
> URL: https://issues.apache.org/jira/browse/HDFS-3974
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 3.0.0
> Reporter: Todd Lipcon
> Assignee: Andy Isaacson
> Priority: Minor
>
> We currently have the following race:
> - Block is underreplicated, hence it's present in neededReplications
> - User deletes the block - its BlockInfo.blockCollection is set to null
> - Admin runs metaSave before the replication monitor runs.
> This causes an NPE since block.getBlockCollection() for one of the
> neededReplication blocks has become null.
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