Kihwal Lee created HDFS-4995:
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Summary: Make getContentSummary() less expensive
Key: HDFS-4995
URL: https://issues.apache.org/jira/browse/HDFS-4995
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 0.23.9, 2.3.0
Reporter: Kihwal Lee
When users call du or count DFS command, getContentSummary() method is called
against namenode. If the directory has many directories and files, it could
hold the namesystem lock for a long time. We've seen it taking over 20 seconds.
Namenode should not allow regular users to cause extended locking.
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