Daryn Sharp created HDFS-12184:
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Summary: Avoid redundant ancestor metadata traversals for
listStatus child entries.
Key: HDFS-12184
URL: https://issues.apache.org/jira/browse/HDFS-12184
Project: Hadoop HDFS
Issue Type: Improvement
Components: namenode
Affects Versions: 2.7.0
Reporter: Daryn Sharp
Assignee: Daryn Sharp
Creating a file status requires metadata for EC, EZ, storage policies, etc that
are computed by traversing up the ancestor inodes. List status will incur the
same penalties for all child entries when one traversal is enough. The penalty
for large directories is not trivial. Storage policies short-circuit the full
traversal. The other lookups should too.
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