Daryn Sharp created HDFS-10673:
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Summary: Optimize FSPermissionChecker's internal path usage
Key: HDFS-10673
URL: https://issues.apache.org/jira/browse/HDFS-10673
Project: Hadoop HDFS
Issue Type: Sub-task
Components: hdfs
Reporter: Daryn Sharp
Assignee: Daryn Sharp
The INodeAttributeProvider and AccessControlEnforcer features degrade
performance and generate excessive garbage even when neither is used. Main
issues:
# A byte[][] of components is unnecessarily created. Each path component
lookup converts a subrange of the byte[][] to a new String[] - then not used by
default attribute provider.
# Subaccess checks are insanely expensive. The full path of every subdir is
created by walking up the inode tree, creating a INode[], building a string by
converting each inode's byte[] name to a string, etc. Which will only be used
if there's an exception.
The expensive of #1 should only be incurred when using the provider/enforcer
feature. For #2, paths should be created on-demand for exceptions.
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