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https://issues.apache.org/jira/browse/HDFS-13813?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16575364#comment-16575364
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Siyao Meng edited comment on HDFS-13813 at 8/9/18 8:29 PM:
-----------------------------------------------------------
Detect if a child inode exist in the global FSDirectory dir when saving
INodeDirectorySection. If not, print error log and count the number of errors.
Note that: If there is at least one error detected, the NameNode would exit and
will NOT clean up the edit logs, code of which is contributed in HDFS-13314 by
[~arpitagarwal].
was (Author: smeng):
Detect if a child inode exist in the global FSDirectory dir when saving
INodeDirectorySection. If not, print error log and count the number of errors.
Note that: If there is at least one error detected, the NameNode would exit and
will NOT clean up the edit logs, whose code logic is contributed in
[HDFS-13314] by [~arpitagarwal].
> Exit NameNode when dangling child inode is detected when saving FsImage
> -----------------------------------------------------------------------
>
> Key: HDFS-13813
> URL: https://issues.apache.org/jira/browse/HDFS-13813
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.0.3
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Major
> Attachments: HDFS-13813.001.patch
>
>
> Recently, the same stack trace as in -HDFS-9406- appears again in the field.
> The symptom of the problem is that *loadINodeDirectorySection()* can't find a
> child inode in inodeMap by the node id in the children list of the directory.
> The child inode could be missing or deleted.
> As for now we didn't have a clear trace to reproduce the problem. Therefore,
> I'm proposing this improvement to detect such corruption (data structure
> inconsistency) when saving the FsImage, so that we can have the FsImage and
> Edit Log to potentially stably reproduce the problem.
>
> In a previous patch HDFS-13314, [~arpitagarwal] did a great job catching
> potential FsImage corruption in two cases. Further, this patch would detect
> if a child inode exist in the global FSDirectory dir when saving
> (serializing) INodeDirectorySection.
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