Jing Zhao created HDFS-5633:
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Summary: 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
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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