zhouyingchao created HDFS-13693:
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Summary: Remove unnecessary search in INodeDirectory.addChild
during image loading
Key: HDFS-13693
URL: https://issues.apache.org/jira/browse/HDFS-13693
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Reporter: zhouyingchao
In FSImageFormatPBINode.loadINodeDirectorySection, all child INodes are added
to their parent INode's map one by one. The adding procedure will search a
position in the parent's map and then insert the child to the position.
However, during image loading, the search is unnecessary since the insert
position should always be at the end of the map given the sequence they are
serialized on disk.
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