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https://issues.apache.org/jira/browse/HDFS-4627?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Suresh Srinivas resolved HDFS-4627.
-----------------------------------
Resolution: Fixed
Fix Version/s: Snapshot (HDFS-2802)
Hadoop Flags: Reviewed
I committed the patch to HDFS-2802 branch. Thank you Jing.
> Fix FSImageFormat#Loader NPE and synchronization issues
> -------------------------------------------------------
>
> Key: HDFS-4627
> URL: https://issues.apache.org/jira/browse/HDFS-4627
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Fix For: Snapshot (HDFS-2802)
>
> Attachments: HDFS-4627.001.patch, HDFS-4627.002.patch
>
>
> 1. Currently FSImageFormat#Loader#loadFilesUnderConstruction calls
> FSDirectory#unprotectedReplaceINodeFile without acquiring FSDirectory's lock.
> FSDirectory#replaceINodeFile should be called instead.
> 2. Currently FSImage#Loader#loadINode does not create block[] object (i.e.,
> keep it as null) when the length of the block is 0. This will cause NPE when
> the loaded INodeFile is empty, and then an append operation on this inode is
> applied from edit log.
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