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https://issues.apache.org/jira/browse/HDFS-5633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-5633:
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Attachment: HDFS-5633.000.patch
> Improve OfflineImageViewer to use less memory
> ---------------------------------------------
>
> Key: HDFS-5633
> URL: https://issues.apache.org/jira/browse/HDFS-5633
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Priority: Minor
> Attachments: HDFS-5633.000.patch
>
>
> Currently after we rename a file/dir which is included in a snapshot, the
> file/dir can be linked with two different reference INodes. To avoid
> saving/loading the inode multiple times in/from FSImage, we use a temporary
> map to record whether we have visited this inode before.
> However, in OfflineImageViewer (specifically, in ImageLoaderCurrent), the
> current implementation simply records all the directory inodes. This can take
> a lot of memory when the fsimage is big. We should only record an inode in
> the temp map when it is referenced by an INodeReference, just like what we do
> in FSImageFormat.
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