[HADOOP-14688] Intern strings in KeyVersion and EncryptedKeyVersion

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.9.0, 3.0.0-beta1
• Component/s: kms
• Target Version/s: 2.9.0
• Assignee: Xiao Chen
• Reporter: Xiao Chen
• Created: 26/Jul/17 18:53
• Updated: 24/Apr/18 20:55
• Resolved: 05/Sep/17 22:20

Description

This is inspired by Misha Dmitriev's work on HDFS-11383.

The key names and key version names are usually the same for a bunch of KeyVersion and EncryptedKeyVersion. We should not create duplicate objects for them.

This is more important to HDFS-10899, where we try to re-encrypt all files' EDEKs in a given EZ. Those EDEKs all has the same key name, and mostly using no more than a couple of key version names.

Issue Links

• is required by: HDFS-10899 Add functionality to re-encrypt EDEKs