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https://issues.apache.org/jira/browse/HDFS-1538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971820#action_12971820
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Todd Lipcon commented on HDFS-1538:
-----------------------------------
The new classes here are:
- *FSImageInspector* - responsible for inspecting each of the configured
storage directories, determining whether a "re-save" is necessary, and deciding
which individual image, edits, and VERSION files should be loaded to
reconstruct the namesystem.
- *ImageLoadPlan* - simple container interface for an image file, a set of
edits files, and a VERSION file. This is essentially the "output" of the image
inspector above. This class also encapsulates the recovery process that happens
inside the {{current/}} directory - eg deleting fsimage.ckpt if it's
incomplete, etc.
I believe this patch to be a straight refactor, with the addition of an extra
log message or two.
> Refactor more startup and image loading code out of FSImage
> -----------------------------------------------------------
>
> Key: HDFS-1538
> URL: https://issues.apache.org/jira/browse/HDFS-1538
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: 0.22.0, 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
>
> For HDFS-1073, we need to be able to continue to load images in the old
> "fsimage/edits/edits.new" layout for the purposes of upgrade. But that code
> will be only for backwards compatibility, and we want to be able to switch to
> new code for the new layout. This subtask is to separate out much of that
> code into an interface which we can implement for both the old and new
> layouts.
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