Haohui Mai created HDFS-5793:
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Summary: Optimize the serialization of PermissionStatus
Key: HDFS-5793
URL: https://issues.apache.org/jira/browse/HDFS-5793
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Haohui Mai
Assignee: Haohui Mai
Attachments: HDFS-5793.000.patch
{{PermissionStatus}} contains the user name, the group name and the permission.
It is serialized into two strings and a short.
Note that the size of unique user / groups names are relatively small, thus
this format has some performance penalties. The names are stored multiple
times, increasing both the storage size and the overhead of reconstructing the
names.
This jira proposes to serialize {{PermissionStatus}} similar to its in-memory
layout. The code can record a mapping between user / group names and ids, and
pack user / group / permission into a single 64-bit long.
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