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https://issues.apache.org/jira/browse/HADOOP-4771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653967#action_12653967
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Konstantin Shvachko commented on HADOOP-4771:
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+1 This looks good.
> FSImage saveFSImage() will have problem.
> ----------------------------------------
>
> Key: HADOOP-4771
> URL: https://issues.apache.org/jira/browse/HADOOP-4771
> Project: Hadoop Core
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.19.0, 0.19.1, 0.20.0
> Reporter: Ruyue Ma
> Assignee: Ruyue Ma
> Fix For: 0.19.1, 0.20.0
>
> Attachments: hadoop-4771-v2.patch, hadoop-4771.patch
>
>
> When you format the namenode , hadoop will call FSImage.saveFsImage().
> saveFsImage includes the following code:
> out.writeLong(fsDir.rootDir.numItemsInTree());
> When format, the fsDir.rootDir.numItemsInTree() should be 1 (it include the
> rootdir). But now fsDir.rootDir.numItemsInTree() is 0.
> The reason why the bug is not simply discovered or triggered is the code in
> FSImage.saveFsImage().->saveINode2Image().
> } else { // write directory inode
> out.writeShort(0); // replication
> Because the directory doesn't have replication factor, so here is 0. This
> will cause loadFilesUnderConstruction() will not load any files when hadoop
> fisrt starts up after format.
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